A kind of original soil solidification slope retaining structure and construction method

Abstract

The present invention relates to the field of geotechnical engineering technology, and in particular to a soil-solidified slope retaining structure and construction method, including foundation construction and excavation of the original soil, preparation of improved adobe, construction of the foundation part of the retaining wall, construction of the main part of the retaining wall, construction of the slope protection part, and construction of the slope top crack repair part. The technical solution uses a soil stabilizer liquid and a soil powder solidifier to improve the original soil, effectively reducing the consumption of non-renewable resources such as sand and gravel. The 7d unconfined compressive strength of the obtained improved adobe can reach 1-1.5Mpa, which lays a good foundation for the slope retaining structure to have a reliable retaining effect. The improved adobe of the technical solution is an environmentally friendly material, green and pollution-free, and can grow vegetation naturally without spraying grass seeds.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, and in particular to an original soil solidified slope retaining structure and a construction method. Background Art

[0002] Common slope management methods in engineering projects mainly include retaining walls and slope protection. The existing retaining wall and slope protection management methods are mainly achieved by using stone slabs, blocks, concrete and even reinforced concrete structures. The raw materials of these structures are mostly non-renewable resources such as sand and gravel. In order to protect such resources, the country has also issued a number of policies to slow down the consumption of such non-renewable resources, but the effect is minimal. Based on this, some of the existing technologies use artificially produced sand and gravel, but artificially produced sand and gravel also have problems such as the processing plant is far away from the construction site and a large transportation cost must be invested.

[0003] In the prior art, there is a patent application document with application number CN201910595782.0, which discloses "a reinforced and solidified soil retaining wall structure and its construction method. The document uses P.O42.5 cement with a mass mixing ratio of 15% to solidify the soil. There are major environmental problems, that is, it is difficult for vegetation to grow on the soil treated with cement, which poses a great threat to the ecological environment. In addition, cement is not universal. For soft soil with high water content, a higher content of cement must be used, and the engineering economic benefits are low.

[0004] In addition, in the prior art, there is an invention patent document with the authorization announcement number CN106592565A, which discloses "a construction method for embankment and bank protection using soil solidifier in land reclamation projects". This document adopts the self-developed MBER soil solidifier, which needs to meet special requirements, that is, the moisture content of the treated crushed soil should be around (1.15wop+2)%. When the requirements cannot be met, the crushed soil needs to be watered or dried, which is very troublesome to implement. In addition, this document is not aimed at slope protection, and its scope of application is limited. Summary of the invention

[0005] In order to solve the problems existing in the above-mentioned prior art, the present technical scheme provides a soil-solidified slope retaining structure and construction method based on soil solidification technology for the protection of soil and soil-like slopes, so as to reduce the consumption of non-renewable resources such as sand and gravel, protect the ecological environment, and improve the utilization rate of the original soil of the slope.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A slope retaining structure based on original soil solidification, characterized in that it includes a slope top crack repair part, a slope protection part, a retaining wall main part and a retaining wall foundation part made of improved adobe as raw materials, the surface of the slope is provided with a slope top crack repair surface, a slope protection surface and a retaining wall main part corresponding to the top crack repair part, the slope protection part and the retaining wall main part, and the slope top crack repair surface, the slope protection surface and the retaining wall main part are connected in sequence from top to bottom; the retaining wall foundation part is arranged at the bottom of the retaining wall main part and embedded in the ground. The improved adobe used in the retaining wall foundation part and the retaining wall main part is a mixture of the original soil with 2%-3% of soil stabilizing liquid agent and 5%-12% of soil powder curing agent added to the original soil by mass; the improved adobe used in the slope protection part and the slope top crack repair part is a mixture of the original soil with 2%-3% of soil stabilizing liquid agent and 3%-8% of soil powder curing agent added to the original soil by mass.

[0008] Specifically, the soil stabilizer liquid agent includes the following ingredients in the following mass ratios: 20%-35% of water-based epoxy resin, 4%-8% of isocyanate, 0.1%-2% of lignin fiber, 15%-23% of neutral water glass, 10%-18% of acrylamide, 0.8%-3% of sodium polycarboxylate, 1%-2% of polyanionic cellulose, 0.2%-0.4% of magnesium oxide powder and 150%-200% of water.

[0009] Specifically, the powdered soil solidifier includes the following ingredients in the following mass ratios: 20%-41% potassium chloride, 4%-10% sodium sulfide, 3%-7% magnesium chloride, 16%-26% calcium chloride, 3%-5% polyanionic cellulose, and 0.3%-2% fixed sulfur ash.

[0010] Preferably, the height of the main surface of the retaining wall is h≤10m, the slope of the main surface of the retaining wall is a≤70°, the horizontal cross-sectional thickness of the main part of the retaining wall is b; the main part of the retaining wall and the main surface of the retaining wall of the slope have the following relationship:

[0011] When h≤5m, within the range of a≤70°, 0.3h≤b≤0.5h; when 5m<h≤10m, a geobag retaining layer is set between the main part of the retaining wall and the slope, and the cross-sectional thickness of the geobag retaining layer is n;

[0012] When 5m<h≤7m, if a≤50°, then 0.2m≤b≤0.4m and 0.6m≤n≤0.7m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.6m≤n≤0.7m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1m≤n≤1.2m;

[0013] When 7m<h≤10m, if a≤50°, then 0.3m≤b≤0.4m and 0.7m≤n≤0.8m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.8m≤n≤0.1m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1.2m≤n≤1.4m.

[0014] Preferably, a reinforced connection structure is provided between the geobag retaining layer and the main part of the retaining wall.

[0015] Preferably, the height of the retaining wall foundation part is d, and 0.4m≤d≤1.5m; the depth of the retaining wall foundation part embedded in the ground is d; the width of the retaining wall foundation part is L; when h≤5m, L=b+k, when 5m<h≤10m, L=n+b+k; wherein, 0.3m≤k≤0.5m.

[0016] According to the above-mentioned slope retaining structure based on solidification of original soil, the present technical solution provides a construction method of the slope retaining structure, which is characterized by: including foundation construction and excavation of original soil, preparation of improved adobe, construction of retaining wall foundation part, construction of retaining wall main part, construction of slope protection part, and construction of slope top crack repair part;

[0017] The foundation construction and excavation of the original soil include the following steps:

[0018] S11, according to the current structure of the slope, the surface structure of the slope is repaired by using an excavator and / or manually digging the original soil to determine the slope top crack repair surface, slope protection surface, and retaining wall main surface of the slope surface, and ensure that the height h of the retaining wall main surface is ≤10m and the slope a is ≤70°;

[0019] S12, recording the height h and slope a of the main surface of the retaining wall, and determining the construction dimensions of the main part of the retaining wall and the foundation part of the retaining wall according to the height h and slope a of the main surface of the retaining wall, including the horizontal cross-sectional thickness b of the main part of the retaining wall and the width L of the foundation part of the retaining wall;

[0020] S13, using an excavator and / or manual digging to dig out the original soil to open a foundation trench with a width of L and a depth of d at the bottom of the main surface of the retaining wall, where 0.4m≤d≤1.5m;

[0021] S14, piling the original soil obtained in step S11 and step S12 in a field prepared in advance;

[0022] S15, preliminarily estimating the amount of original soil required according to the retaining structure currently under construction, and judging whether the amount of original soil in the field meets the construction requirements of the current retaining structure; if so, preparing improved adobes; if not, digging original soil with the same soil quality as the slope at a location no more than 500 meters away from the slope and putting it in the field, and preparing improved adobes after the amount of original soil in the field meets the construction requirements of the current retaining structure;

[0023] The improved adobe is prepared as follows: a soil stabilizing liquid agent and a soil powder curing agent required for preparing the improved adobe are prepared, and the soil stabilizing liquid agent and the soil powder curing agent are mixed with the original soil in the waiting field as required to prepare the improved adobe required for the slope top crack repair part, the slope protection part, the retaining wall main part and the retaining wall foundation part; wherein, a soil stabilizing liquid agent having a mass ratio of 2%-3% to the original soil and a soil powder curing agent having a mass ratio of 5%-12% to the original soil are mixed with the original soil to prepare the improved adobe required for the retaining wall foundation part and the retaining wall main part; a soil stabilizing liquid agent having a mass ratio of 2%-3% to the original soil and a soil powder curing agent having a mass ratio of 3%-8% to the original soil are mixed with the original soil to prepare the improved adobe required for the slope protection part and the slope top crack repair part;

[0024] The retaining wall foundation is constructed by placing the improved adobe required for the retaining wall foundation in the foundation trench and compacting the improved adobe. After the improved adobe is solidified, the retaining wall foundation is constructed.

[0025] The construction of the main part of the retaining wall: according to the planning of the main part of the retaining wall in step S12, the improved adobe required for the construction of the main part of the retaining wall is placed on the main surface of the retaining wall of the slope, and the improved adobe is compacted. After the improved adobe is solidified, the construction of the main part of the retaining wall is completed;

[0026] The slope protection part is constructed by placing the improved adobe required for the slope protection part on the slope protection surface of the slope, and compacting the improved adobe. After the improved adobe is solidified, the slope protection part is constructed;

[0027] The construction of the slope top crack repair part: fill the cracks on the slope top crack repair surface with the improved adobe required for constructing the slope top crack repair part, and smooth and compact the surface of the cracks filled with the improved adobe. After the improved adobe is solidified, the construction of the slope top crack repair part is completed.

[0028] Specifically, in the process of preparing the improved adobe, the soil stabilizer liquid agent includes the following components in mass ratio: 20%-35% water-based epoxy resin, 4%-8% isocyanate, 0.1%-2% lignin fiber, 15%-23% neutral water glass, 10%-18% acrylamide, 0.8%-3% sodium polycarboxylate, 1%-2% polyanionic cellulose, 0.2%-0.4% magnesium oxide powder and 150%-200% water; the soil powder curing agent includes the following components in mass ratio: 20%-41% potassium chloride, 4%-10% sodium sulfide, 3%-7% magnesium chloride, 16%-26% calcium chloride, 3%-5% polyanionic cellulose, and 0.3%-2% fixed sulfur ash.

[0029] Preferably, in the process of preparing the improved adobe, mixing the soil stabilizing liquid agent and the soil powder curing agent with the original soil in the field to be prepared comprises the following steps:

[0030] S21, piling up all the original soil in the field into a soil pile, and using an excavator or a loader to dig a soil pit in the middle of the soil pile;

[0031] S22, putting a soil stabilizing liquid agent in a mass ratio of 2% to 3% of the original soil into the soil pit, and using an excavator or a loader to fully mix the original soil and the soil stabilizing liquid agent;

[0032] S23, dividing the original soil mixed with the soil stabilizing liquid agent into two soil piles, and using an excavator or a loader to dig a soil pit between the two soil piles;

[0033] S24, put a soil powder solidifier in a ratio of 5%-12% of the original soil mass to the pit of one of the soil piles, put a soil powder solidifier in a ratio of 3%-8% of the original soil mass to the pit of the other soil pile, and use an excavator or loader to fully mix the two soil piles with the soil powder solidifier.

[0034] Preferably, the construction of the retaining wall foundation part comprises the following steps:

[0035] S31, flattening and compacting the bottom of the foundation trench;

[0036] S32, using an excavator or loader to spread the corresponding improved adobe in layers into the foundation trench; the thickness of each layer is controlled to be 0.2m-0.4m, and the improved adobe is compacted by a flat hydraulic vibration rammer installed at the arm end of the excavator, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 4-5 times;

[0037] S33, the height of the adobe to be improved is flush with the notch of the foundation trench, and an 18-22 ton roller is used for rolling. The rolling process includes 2-3 times of static rolling and 3-4 times of vibration rolling;

[0038] S34, waiting for the improved adobe to solidify.

[0039] Preferably, in step S12, when h≤5m, within the range of a≤70°, 0.3h≤b≤0.5h, L=b+k, 0.3m≤k≤0.5m; when 5m<h≤10m, a geobag retaining layer is provided between the main part of the retaining wall and the slope, and the cross-sectional thickness of the geobag retaining layer is n, L=n+b+k;

[0040] When 5m<h≤7m, if a≤50°, then 0.2m≤b≤0.4m and 0.6m≤n≤0.7m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.6m≤n≤0.7m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1m≤n≤1.2m;

[0041] When 7m<h≤10m, if a≤50°, then 0.3m≤b≤0.4m and 0.7m≤n≤0.8m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.8m≤n≤0.1m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1.2m≤n≤1.4m.

[0042] Preferably, the construction of the main part of the retaining wall comprises the following steps:

[0043] S41, according to the record result in step S22, determine whether it is necessary to build a geobag retaining layer; if it is not necessary to build a geobag retaining layer, directly spread the improved adobe used for building the main part of the retaining wall on the main surface of the retaining wall of the slope at a thickness of 0.5-0.8m; if it is necessary to build a geobag retaining layer, build a geobag retaining layer on the main surface of the retaining wall of the slope, and then spread the improved adobe used for building the main part of the retaining wall on the surface of the geobag retaining layer at a thickness of 0.5-0.8m;

[0044] S42, compacting the surface of the improved adobe layer using a flat hydraulic vibration rammer installed at the end of the excavator arm, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 4-6 times;

[0045] S43, compacting the side of the improved adobe layer using a flat hydraulic vibration rammer, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 4-6 times;

[0046] S44, measure the thickness of the improved adobe that has been spread; if the target thickness of the main part of the earth wall has been reached, stop spreading the improved adobe and wait for the improved adobe to solidify; if the target thickness of the main part of the earth wall has not been reached, continue to spread new improved adobe on the surface of the spread improved adobe layer at a thickness of 0.5-0.8m, and then return to step S42.

[0047] Preferably, in step S41, constructing a geobag retaining layer comprises the following steps:

[0048] S41-1, prepare enough geobags and fill the geobags with improved adobe for constructing the main part of the retaining wall;

[0049] S41-2, geobags filled with improved adobe are spread in a staggered manner on the main surface of the retaining wall of the slope at a thickness of 0.5-0.8m;

[0050] S41-3, compact the surface of the laid geobag layer with a flat hydraulic vibration rammer. The vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 1-2 times;

[0051] S41-4, measure the thickness of the laid geobags; if the target thickness of the geobag retaining layer has been reached, insert a number of reinforcements vertically to the surface of the geobag retaining layer to complete the construction of the geobag retaining layer; if the target thickness of the geobag retaining layer has not been reached, continue to lay new geobags on the surface of the laid geobag layer at a thickness of 0.5-0.8m, and then return to step S41-3.

[0052] Beneficial effects brought by this technical solution:

[0053] 1) The improved adobe used in this technical solution adopts clay petrification technology, that is, it mainly uses soil stabilizer liquid and soil powder solidifier to improve the soil (original soil), effectively reducing the consumption of non-renewable resources such as sand and gravel. Compared with the existing technology, this technical solution uses green and pollution-free soil stabilizer liquid and soil powder solidifier, which can reduce water and solidify soft soil with high water content. Based on this, it can be applied to soil with a wider range of water content and has a wide range of applications. The soil improved by soil stabilizer liquid and soil powder solidifier has a long-term solidification effect, is more adaptable to soil changes, and can be reused. In addition, the 7d unconfined compressive strength of the improved adobe can reach 1-1.5Mpa, which lays a good foundation for the reliable retaining effect of the slope retaining structure.

[0054] 2) This technical solution uses the original soil (i.e. improved adobe) treated with soil stabilizer liquid agent and soil powder solidifier as the raw material of retaining structure. Improved adobe is an environmentally friendly material, green and pollution-free, and provides a more suitable environment for vegetation growth. The seeds in the original soil can germinate and grow freely, achieving the purpose of natural growth of vegetation without spraying grass seeds. For areas with poor soil, appropriate amount of seeds can also be added to the improved adobe to increase the planting density. In summary, in the context of the country's vigorous rectification of environmental problems, the advantages of this technical solution are more prominent.

[0055] 3) This technical solution uses local materials, saving material transportation costs. By improving the original soil, it achieves effective utilization of the original soil. The improved adobe replaces non-renewable resources such as sand and gravel, which can effectively solve the conflict between the current non-renewable sand and gravel resources and the common retaining structures that mostly use sand and gravel resources. It does not waste sand and gravel resources, reduces engineering costs, and meets the requirements of relevant policies issued by the state to protect such resources.

[0056] 4) This technical solution forms a systematic and complete system of slope retaining structures and construction methods. It has a simple structure, convenient construction, and a wider range of applications. It can adjust the dosage of soil stabilizer liquid agent and soil powder solidifier to carry out comprehensive prevention and control of slopes with different soil types, different water contents, and different disaster degrees. It has good practical engineering application and reference value. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a schematic diagram of a slope retaining structure without a geobag retaining layer;

[0058] Figure 2 Schematic diagram of slope retaining structure with geobag retaining layer;

[0059] Figure 3 A comparison table of the relationship between the main part of the retaining wall and the main surface of the slope retaining wall;

[0060] In the figure:

[0061] 1. The part where the cracks on the top of the slope are repaired; 2. The part where the slope is protected; 3. The main part of the retaining wall; 4. The foundation part of the retaining wall; 5. The surface where the cracks on the top of the slope are repaired; 6. The surface where the slope is protected; 7. The main surface of the retaining wall; 8. The side slope; 9. The geobag retaining layer; 10. Reinforcement; 11. The foundation trench. DETAILED DESCRIPTION

[0062] The present invention is further described below in conjunction with the accompanying drawings and examples, but it should not be understood that the present invention is limited to the following examples. Without departing from the concept of the present invention, any variation and improvement of the present invention in this field should be included in the protection scope of the claims of the present invention.

[0063] Example 1

[0064] This embodiment discloses a slope retaining structure based on original soil solidification, as a preferred implementation scheme of this technical solution, comprising a slope top crack repairing part 1, a slope protection part 2, a retaining wall main part 3 and a retaining wall foundation part 4 made of improved adobe as raw materials, and the retaining wall foundation part 4 is arranged at the bottom of the retaining wall main part 3. The improved adobe used in the retaining wall foundation part 4 and the retaining wall main part 3 is a mixture of a soil stabilizing liquid agent with a mass ratio of 2%-3% to the original soil and a soil powder curing agent with a mass ratio of 5%-12% to the original soil on the basis of the original soil; the improved adobe used in the slope protection part 2 and the slope top crack repairing part 1 is a mixture of a soil stabilizing liquid agent with a mass ratio of 2%-3% to the original soil and a soil powder curing agent with a mass ratio of 3%-8% to the original soil on the basis of the original soil. The liquid soil stabilizer includes the following components in mass ratio: 20%-35% waterborne epoxy resin, 4%-8% isocyanate, 0.1%-2% lignin fiber, 15%-23% neutral water glass, 10%-18% acrylamide, 0.8%-3% sodium polycarboxylate, 1%-2% polyanionic cellulose, 0.2%-0.4% magnesium oxide powder and 150%-200% water. In addition, the powdered soil curing agent includes the following components in mass ratio: 20%-41% potassium chloride, 4%-10% sodium sulfide, 3%-7% magnesium chloride, 16%-26% calcium chloride, 3%-5% polyanionic cellulose, and 0.3%-2% sulfur-fixing ash.

[0065] The surface of the slope 8 is provided with a slope top crack repairing surface 5, a slope protection surface 6, and a retaining wall main body surface 7 from top to bottom, which correspond to the top crack repairing part, the slope protection part 2, and the retaining wall main body 3. On the slope 8, there is an area where it is not suitable to construct the retaining wall main body 3. The slope protection surface 6 is provided in this area for setting the slope protection part 2 for protection. The thickness of the slope protection part 2 is determined according to the actual height and slope of the slope protection surface 6. For example, when the height of the slope protection surface 6 is less than or equal to 5m and the slope of the slope protection surface 6 is less than or equal to 60°, the thickness of the slope protection part 2 is 10-20cm. The main part of the retaining wall belongs to the gravity retaining structure. The height and slope are the primary / basic factors to be considered in the structural design of the main part of the gravity retaining wall. Retaining walls exceeding 10m and greater than 70 degrees should not be treated as gravity retaining walls. A more complex treatment plan that is more suitable for site conditions should be adopted. Therefore, the height of the main surface 7 of the retaining wall is h≤10m, the slope of the main surface 7 of the retaining wall is a≤70°, and the horizontal cross-sectional thickness of the main part 3 of the retaining wall is b; after rigorous theoretical calculations and repeated verifications of multiple field experiences, the main part 3 of the retaining wall and the main surface 7 of the retaining wall of the slope 8 have the following relationship:

[0066] When h≤5m, within the range of a≤70°, 0.3h≤b≤0.5h; when 5m<h≤10m, a geobag retaining layer 9 is provided between the retaining wall main part 3 and the slope 8, and a reinforcement 10 connection structure is provided between the geobag retaining layer 9 and the retaining wall main part 3 to increase the stability of the retaining wall main part 3, and the cross-sectional thickness of the geobag retaining layer 9 is n;

[0067] When 5m<h≤7m, if a≤50°, then 0.2m≤b≤0.4m and 0.6m≤n≤0.7m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.6m≤n≤0.7m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1m≤n≤1.2m;

[0068] When 7m<h≤10m, if a≤50°, then 0.3m≤b≤0.4m and 0.7m≤n≤0.8m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.8m≤n≤0.1m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1.2m≤n≤1.4m.

[0069] Furthermore, the height of the retaining wall foundation part 4 is d, and 0.4m≤d≤1.5m; the retaining wall foundation part 4 is embedded in the ground, and the embedding depth is d; the width of the retaining wall foundation part 4 is L; when h≤5m, L=b+k, when 5m<h≤10m, L=n+b+k; among which, 0.3m≤k≤0.5m.

[0070] The improved adobe used in this technical solution adopts clay petrification technology, that is, it mainly uses soil stabilizing liquid agent and soil powder solidifying agent to improve the soil (original soil), effectively reducing the consumption of non-renewable resources such as sand and gravel, and the effect is good. That is, compared with the existing technology, this technical solution uses green and pollution-free soil stabilizing liquid agent and soil powder solidifying agent, which can be applied to soils with a wider range of moisture content and has a wide range of applications. In addition, the soil improved by the soil stabilizing liquid agent and soil powder solidifying agent has a long-term solidification effect, is more adaptable to changes in soil quality, and can be reused. In addition, in this technical solution, the 7d unconfined compressive strength of the improved adobe can reach 1-1.5Mpa, which lays a good foundation for the slope 8 retaining structure to have a reliable retaining effect.

[0071] In addition, the roots of the vegetation growing on the retaining structure pass through the loose differentiation layer in the shallow layer and anchor to the more stable rock and soil layer in the depth, which can play the role of prestressed anchor rods. At the same time, it can absorb and evaporate the water in the slope, reduce the pore water pressure of the soil, improve the shear strength of the soil, and help the stability of the slope. Therefore, this technical solution uses the original soil (i.e., improved adobe) treated with soil stabilizing liquid agent and soil powder curing agent as the raw material of the retaining structure. The improved adobe is an environmentally friendly material, green and pollution-free, and provides a more suitable environment for vegetation growth. The seeds in the original soil can germinate and grow freely, achieving the purpose of naturally growing vegetation without spraying grass seeds. For areas with poor soil, appropriate amounts of seeds can also be added to the improved adobe to increase the planting density. In summary, in the context of the country's vigorous efforts to rectify environmental problems, the advantages of this technical solution are more prominent.

[0072] Example 2

[0073] This embodiment takes the slope 8 with a height of h=5m and a slope a=60° of the retaining wall main surface 7 as an example, and discloses a slope retaining structure based on original soil solidification. As a preferred embodiment of the present invention, the slope top crack repair part 1, the slope protection part 2, the retaining wall main part 3 and the retaining wall foundation part 4 are made of improved adobe as raw materials, and the retaining wall foundation part 4 is arranged at the bottom of the retaining wall main part 3. The improved adobe used in the retaining wall foundation part 4 is a mixture of a soil stabilizing liquid agent with a mass ratio of 2% to the original soil and a soil powder curing agent with a mass ratio of 8% to the original soil on the basis of the original soil. The improved adobe used in the retaining wall main part 3 is a mixture of a soil stabilizing liquid agent with a mass ratio of 2% to the original soil and a soil powder curing agent with a mass ratio of 6% to the original soil on the basis of the original soil. The improved adobe used in the slope protection part 2 is a mixture of a soil stabilizing liquid agent with a mass ratio of 2% to the original soil and a soil powder curing agent with a mass ratio of 4% to the original soil on the basis of the original soil. The improved adobe used in the slope top crack repair part 1 is a mixture of original soil with 2% of the original soil mass ratio of a soil stabilizer liquid agent and 4% of the original soil mass ratio of a soil powdered solidifier added to the original soil.

[0074] The horizontal cross-sectional thickness of the main part 3 of the retaining wall is b = 1.5 m;

[0075] The height of the retaining wall foundation part 4 is d=1.2m, and the retaining wall foundation part 4 is embedded in the ground with an embedding depth of 1.2m; the width of the retaining wall foundation part 4 is L=1.8m.

[0076] Example 3

[0077] This embodiment takes the slope 8 with a height of h=7m and a slope a=70° of the main surface 7 of the retaining wall as an example, and discloses a slope retaining structure based on the solidification of the original soil. As a preferred embodiment of the present invention, the slope top crack repair part 1, the slope protection part 2, the retaining wall main part 3 and the retaining wall foundation part 4 are made of improved adobe as raw materials, and the retaining wall foundation part 4 is arranged at the bottom of the retaining wall main part 3. The improved adobe used in the retaining wall foundation part 4 is a mixture of a soil stabilizing liquid agent with a mass ratio of 2% to the original soil and a soil powder curing agent with a mass ratio of 10% to the original soil on the basis of the original soil. The improved adobe used in the retaining wall main part 3 is a mixture of a soil stabilizing liquid agent with a mass ratio of 2% to the original soil and a soil powder curing agent with a mass ratio of 8% to the original soil on the basis of the original soil. The improved adobe used in the slope protection part 2 is a mixture of a soil stabilizing liquid agent with a mass ratio of 2% to the original soil and a soil powder curing agent with a mass ratio of 6% to the original soil on the basis of the original soil. The improved adobe used in the slope top crack repair part 1 is a mixture of original soil with 2% of the original soil mass ratio of a soil stabilizer liquid agent and 6% of the original soil mass ratio of a soil powdered solidifier added to the original soil.

[0078] The horizontal cross-sectional thickness of the main part 3 of the retaining wall is b = 0.6 m;

[0079] A geobag retaining layer 9 is provided between the main part 3 of the retaining wall and the slope 8, the cross-sectional thickness of the geobag retaining layer 9 is n=1.2m, and a reinforcement 10 connection structure is provided between the geobag retaining layer 9 and the main part 3 of the retaining wall;

[0080] The height of the retaining wall foundation part 4 is d=1.4m, and the retaining wall foundation part 4 is embedded in the ground with an embedding depth of 1.4m; the width of the retaining wall foundation part 4 is L=2.2m.

[0081] Example 4

[0082] This embodiment discloses a construction method of a slope retaining structure, which is a preferred implementation scheme of the present invention, including foundation construction and excavation of original soil, preparation of improved adobe, construction of retaining wall foundation part 4, construction of retaining wall main part 3, construction of slope protection part 2, and construction of slope top crack repair part 1.

[0083] The foundation construction and excavation of the original soil include the following steps:

[0084] S11, according to the current structure of the slope 8, the surface structure of the slope 8 is repaired by excavating the original soil with an excavator and / or manually, and the top crack repair surface 5, the slope protection surface 6, and the retaining wall main surface 7 of the slope 8 are determined, and the height h of the retaining wall main surface 7 is ≤ 10m and the slope a is ≤ 70°;

[0085] S12, record the height h and slope a of the retaining wall main surface 7, and determine the construction dimensions of the retaining wall main part 3 and the retaining wall foundation part 4 according to the height h and slope a of the retaining wall main surface 7, including the horizontal cross-sectional thickness b of the retaining wall main part 3 and the width L of the retaining wall foundation part 4; wherein:

[0086] When h≤5m, within the range of a≤70°, 0.3h≤b≤0.5h, L=b+k, 0.3m≤k≤0.5m; when 5m<h≤10m, a geobag retaining layer 9 is provided between the retaining wall main body 3 and the slope 8, and the cross-sectional thickness of the geobag retaining layer 9 is n, L=n+b+k;

[0087] When 5m<h≤7m, if a≤50°, then 0.2m≤b≤0.4m and 0.6m≤n≤0.7m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.6m≤n≤0.7m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1m≤n≤1.2m;

[0088] When 7m<h≤10m, if a≤50°, then 0.3m≤b≤0.4m and 0.7m≤n≤0.8m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.8m≤n≤0.1m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1.2m≤n≤1.4m;

[0089] S13, using an excavator and / or manually digging the original soil to open a foundation trench 11 with a width of L and a depth of d at the bottom of the main surface 7 of the retaining wall, wherein 0.4m≤d≤1.5m;

[0090] S14, piling the original soil obtained in step S11 and step S12 in a field prepared in advance;

[0091] S15, preliminarily estimate the amount of original soil required based on the retaining structure currently under construction, and judge whether the amount of original soil in the field can meet the construction requirements of the current retaining structure; if so, prepare improved adobe; if not, dig original soil with the same soil quality as the slope 8 into the field at a location no more than 500 meters away from the slope 8, and after the amount of original soil in the field meets the construction requirements of the current retaining structure, prepare improved adobe; wherein, the distance is limited in order to eliminate transportation costs, reflecting the advantages of the use of original soil in this technical solution; since original soil is used, soil quality problems are easier to solve, and ensuring similar or even identical soil quality can ensure the overall effect of soil improvement, thereby ensuring the overall strength and stability of the retaining structure.

[0092] The preparation of improved adobe comprises the following steps:

[0093] First, a soil stabilizing liquid agent and a soil powder curing agent required for preparing improved adobe are prepared, wherein the soil stabilizing liquid agent includes the following components in mass ratio: 20%-35% of water-based epoxy resin, 4%-8% of isocyanate, 0.1%-2% of lignin fiber, 15%-23% of neutral water glass, 10%-18% of acrylamide, 0.8%-3% of sodium polycarboxylate, 1%-2% of polyanionic cellulose, 0.2%-0.4% of magnesium oxide powder and 150%-200% of water; the soil powder curing agent includes the following components in mass ratio: 20%-41% of potassium chloride, 4%-10% of sodium sulfide, 3%-7% of magnesium chloride, 16%-26% of calcium chloride, 3%-5% of polyanionic cellulose, and 0.3%-2% of sulfur-fixing ash;

[0094] Then the soil stabilizing liquid agent and the soil powder curing agent are mixed with the original soil in the waiting field as required to prepare the improved adobe required for the slope top crack repair part 1, the slope protection part 2, the retaining wall main part 3 and the retaining wall foundation part 4; wherein, the soil stabilizing liquid agent with a mass ratio of 2%-3% to the original soil and the soil powder curing agent with a mass ratio of 5%-12% to the original soil are mixed with the original soil to prepare the improved adobe required for the retaining wall foundation part 4 and the retaining wall main part 3; the soil stabilizing liquid agent with a mass ratio of 2%-3% to the original soil and the soil powder curing agent with a mass ratio of 3%-8% to the original soil are mixed with the original soil to prepare the improved adobe required for the slope protection part 2 and the slope top crack repair part 1.

[0095] The retaining wall foundation part 4 is constructed by placing the improved adobe required for constructing the retaining wall foundation part 4 in the foundation trench 11, and compacting the improved adobe. After the improved adobe is solidified, the construction of the retaining wall foundation is completed.

[0096] The construction of the retaining wall main part 3: according to the planning of the retaining wall main part 3 in step S12, the improved adobe required for constructing the retaining wall main part 3 is placed on the retaining wall main surface 7 of the slope 8, and the improved adobe is compacted. After the improved adobe is solidified, the construction of the retaining wall main part 3 is completed.

[0097] The construction of the slope protection part 2 is as follows: the improved adobe required for the construction of the slope protection part 2 is placed on the slope protection surface 6 of the slope 8, and the improved adobe is compacted. After the improved adobe is solidified, the construction of the slope protection part 2 is completed.

[0098] The construction of the slope top crack repair part 1 is as follows: the improved adobe required for constructing the slope top crack repair part 1 is filled into the cracks of the slope top crack repair surface 5, and the surface of the cracks filled with the improved adobe is smoothed and compacted. After the improved adobe is solidified, the construction of the slope top crack repair part 1 is completed.

[0099] This technical solution uses local materials, saving material transportation costs. By improving the original soil, it realizes the effective use of the original soil. The improved adobe replaces the non-renewable resources of sand and gravel, which can effectively solve the conflict between the current non-renewable sand and gravel resources and the common retaining structure forms that mostly use sand and gravel resources. It does not waste sand and gravel resources, reduces engineering costs, and meets the requirements of relevant policies issued by the state to protect such resources. In addition, this technical solution forms a systematic and complete slope 8 retaining structure form and construction method system, which has a simple structure, convenient construction, and a wider range of applications. By adjusting the amount of soil stabilizer liquid agent and soil powder curing agent, it can be used for comprehensive prevention and control of slopes 8 with different soil qualities, different water contents, and different disaster levels. It has good practical engineering application and reference value.

[0100] Example 5

[0101] This embodiment takes the slope 8 with a height of h=5m and a slope a=60° of the retaining wall main surface 7 as an example, and discloses a construction method of a slope retaining structure, as a preferred implementation scheme of the present invention, including foundation construction and excavation of original soil, preparation of improved adobe, construction of retaining wall foundation part 4, construction of retaining wall main part 3, construction of slope protection part 2, and construction of slope top crack repair part 1.

[0102] The foundation construction and excavation of the original soil include the following steps:

[0103] S11, according to the current structure of the slope 8, the surface structure of the slope 8 is repaired by digging the original soil with an excavator and manual labor, and the top crack repair surface 5, the slope protection surface 6, and the retaining wall main surface 7 of the slope 8 are determined, so that the retaining wall main surface 7 has a height h of 5m and a slope a of 60°;

[0104] S12, record the height h and slope a of the retaining wall main surface 7, and determine the construction dimensions of the retaining wall main part 3 and the retaining wall foundation part 4 according to the height h and slope a of the retaining wall main surface 7, including the horizontal cross-sectional thickness b of the retaining wall main part 3 and the width L of the retaining wall foundation part 4, where b=2m and L=2.4m;

[0105] S13, using an excavator and manual labor to dig out the original soil to open a foundation trench 11 with a width of L and a depth of d at the bottom of the retaining wall main surface 7, where d=1.4m;

[0106] S14, piling the original soil obtained in step S11 and step S12 in a field prepared in advance;

[0107] S15, preliminarily estimate the amount of original soil required based on the retaining structure currently under construction, and judge whether the amount of original soil in the field meets the construction requirements of the current retaining structure; if so, prepare improved adobes; if not, dig original soil with the same soil quality as slope 8 at a location 400 meters away from slope 8 and put it into the field, and after the amount of original soil in the field meets the construction requirements of the current retaining structure, prepare improved adobes.

[0108] The preparation of improved adobe comprises the following steps:

[0109] S21, preparing a soil stabilizing liquid agent and a soil powder curing agent required for preparing improved adobe, wherein the soil stabilizing liquid agent includes the following components in mass ratio: 20%-35% of water-based epoxy resin, 4%-8% of isocyanate, 0.1%-2% of lignin fiber, 15%-23% of neutral water glass, 10%-18% of acrylamide, 0.8%-3% of sodium polycarboxylate, 1%-2% of polyanionic cellulose, 0.2%-0.4% of magnesium oxide powder and 150%-200% of water; the soil powder curing agent includes the following components in mass ratio: 20%-41% of potassium chloride, 4%-10% of sodium sulfide, 3%-7% of magnesium chloride, 16%-26% of calcium chloride, 3%-5% of polyanionic cellulose, and 0.3%-2% of sulfur-fixing ash;

[0110] S22, mixing the soil stabilizing liquid agent and the soil powder curing agent with the original soil in the waiting field as required to prepare the improved adobe required for the slope top crack repair part 1, the slope protection part 2, the retaining wall main part 3 and the retaining wall foundation part 4, specifically comprising the following steps:

[0111] S22-1, all the original soil in the field is piled into a soil pile, and a soil pit is dug in the middle of the soil pile by an excavator or a loader;

[0112] S22-2, put a soil stabilizing liquid agent in a ratio of 2% of the original soil mass into the soil pit, and use an excavator or loader to fully mix the original soil and the soil stabilizing liquid agent;

[0113] S23-3, dividing the original soil mixed with the soil stabilizing liquid agent into two soil piles, and using an excavator or a loader to dig a soil pit between the two soil piles;

[0114] S24-4, put a soil powder solidifier at a mass ratio of 9% to the original soil into the pit of one of the soil piles, put a soil powder solidifier at a mass ratio of 7% to the original soil into the pit of the other soil pile, and use an excavator or loader to fully mix the two soil piles with the soil powder solidifier.

[0115] Construction of retaining wall foundation part 4: The improved adobe required for construction of retaining wall foundation part 4 is placed in the foundation trench 11, and the improved adobe is compacted. After the improved adobe is solidified, the construction of the retaining wall foundation is completed, which specifically includes the following steps:

[0116] S31, flattening and compacting the bottom of the foundation trench 11 to ensure the subsequent compaction quality of the improved adobe;

[0117] S32, using an excavator or a loader to spread the corresponding improved adobe in layers into the foundation trench 11; the thickness of each layer is controlled to be 0.2m, and the improved adobe is compacted by a flat hydraulic vibration rammer installed at the arm end of the excavator, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 4 times;

[0118] S33, the height of the adobe to be improved is flush with the notch of the foundation trench 11, and a 20-ton roller is used for rolling. The rolling process includes two static rollings and three vibration rollings. If the width of the foundation trench 11 exceeds the width of the roller, the foundation trench 11 is rolled in sections along the width direction. When the roller is working in two adjacent areas, the overlapping width of the construction area is controlled at 200 mm, and the driving speed of the roller should be controlled at 2 km / h.

[0119] S34, waiting for the improved adobe to solidify.

[0120] The construction of the retaining wall main part 3 comprises the following steps:

[0121] S41, spreading the improved adobe used for constructing the main part 3 of the retaining wall to the main surface 7 of the retaining wall of the slope 8 in a thickness of 0.5 m;

[0122] S42, compacting the surface of the improved adobe layer using a flat hydraulic vibration rammer installed at the arm end of the excavator, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 5 times;

[0123] S43, compacting the side of the improved adobe layer using a flat hydraulic vibration rammer, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 5 times;

[0124] S44, measure the thickness of the improved adobe that has been spread; if the target thickness of the main part of the earth wall has been reached, stop spreading the improved adobe and wait for the improved adobe to solidify; if the target thickness of the main part of the earth wall has not been reached, continue to spread new improved adobe on the surface of the spread improved adobe layer at a thickness of 0.5m, and then return to step S42.

[0125] Construction of slope protection part 2: placing the improved adobe required for construction of slope protection part 2 on the slope protection surface 6 of the slope 8, and compacting the improved adobe. After the improved adobe is solidified, the construction of slope protection part 2 is completed;

[0126] Construction of the slope top crack repair part 1: fill the cracks of the slope top crack repair surface 5 with the improved adobe required for construction of the slope top crack repair part 1, and smooth and compact the surface of the cracks filled with the improved adobe. After the improved adobe is solidified, the construction of the slope top crack repair part 1 is completed.

[0127] Example 6

[0128] This embodiment takes the slope 8 with a height h=8m and a slope a=70° of the retaining wall main surface 7 as an example, and discloses a construction method of a slope retaining structure, as a preferred implementation scheme of the present invention, including foundation construction and excavation of original soil, preparation of improved adobe, construction of retaining wall foundation part 4, construction of retaining wall main part 3, construction of slope protection part 2, and construction of slope top crack repair part 1.

[0129] The foundation construction and excavation of the original soil include the following steps:

[0130] S11, according to the current structure of the slope 8, the surface structure of the slope 8 is repaired by digging the original soil with an excavator, and the top crack repair surface 5, the slope protection surface 6, and the retaining wall main surface 7 of the slope 8 are determined, so that the retaining wall main surface 7 has a height h of 8m and a slope a of 70°;

[0131] S12, record the height h and slope a of the retaining wall main surface 7, and determine the construction dimensions of the retaining wall main part 3 and the retaining wall foundation part 4 according to the height h and slope a of the retaining wall main surface 7, including the horizontal cross-sectional thickness b of the retaining wall main part 3 and the width L of the retaining wall foundation part 4, where b=0.6m and L=2.3m;

[0132] S13, using an excavator to dig the original soil to open a foundation trench 11 with a width of L and a depth of d at the bottom of the main surface 7 of the retaining wall, where d=1.5m;

[0133] S14, piling the original soil obtained in step S11 and step S12 in a field prepared in advance;

[0134] S15, preliminarily estimate the amount of original soil required based on the retaining structure currently under construction, and judge whether the amount of original soil in the field meets the construction requirements of the current retaining structure; if so, prepare improved adobes; if not, dig original soil with the same soil quality as slope 8 at a location 450 meters away from slope 8 and put it into the field, and after the amount of original soil in the field meets the construction requirements of the current retaining structure, prepare improved adobes.

[0135] The preparation of improved adobe comprises the following steps:

[0136] The preparation of improved adobe comprises the following steps:

[0137] S21, preparing a soil stabilizing liquid agent and a soil powder curing agent required for preparing improved adobe, wherein the soil stabilizing liquid agent includes the following components in mass ratio: 20%-35% of water-based epoxy resin, 4%-8% of isocyanate, 0.1%-2% of lignin fiber, 15%-23% of neutral water glass, 10%-18% of acrylamide, 0.8%-3% of sodium polycarboxylate, 1%-2% of polyanionic cellulose, 0.2%-0.4% of magnesium oxide powder and 150%-200% of water; the soil powder curing agent includes the following components in mass ratio: 20%-41% of potassium chloride, 4%-10% of sodium sulfide, 3%-7% of magnesium chloride, 16%-26% of calcium chloride, 3%-5% of polyanionic cellulose, and 0.3%-2% of sulfur-fixing ash;

[0138] S22, mixing the soil stabilizing liquid agent and the soil powder curing agent with the original soil in the site as required to prepare the improved adobe required for the slope top crack repair part 1, the slope protection part 2, the retaining wall main part 3 and the retaining wall foundation part 4, specifically: using an excavator or a loader to divide the original soil in the site into four soil piles corresponding to the slope top crack repair part 1, the slope protection part 2, the retaining wall main part 3 and the retaining wall foundation part 4, wherein the first soil pile corresponding to the slope top crack repair part 1 is mixed with a soil stabilizing liquid agent with a mass ratio of 2.5% to the original soil and a soil stabilizing liquid agent with a mass ratio of 1.5% to the original soil. The mass ratio of the soil powder curing agent is 7%; the second soil pile corresponds to the slope protection part 2, mixed with a soil stabilizing liquid agent with a mass ratio of 2% to the original soil and a soil powder curing agent with a mass ratio of 6% to the original soil; the third soil pile corresponds to the retaining wall main body 3, mixed with a soil stabilizing liquid agent with a mass ratio of 2% to the original soil and a soil powder curing agent with a mass ratio of 10% to the original soil; the fourth soil pile corresponds to the slope retaining wall foundation part 4, mixed with a soil stabilizing liquid agent with a mass ratio of 2.5% to the original soil and a soil powder curing agent with a mass ratio of 11% to the original soil. The specific method of adding soil powder curing agent and soil powder curing agent is:

[0139] First, an excavator or loader is used to dig a pit on the corresponding soil pile; then a soil stabilizing liquid agent of a corresponding mass ratio is added into the pit, and the soil pile and the soil stabilizing liquid agent are fully mixed by the excavator or loader; an excavator or loader is used to dig a pit in the middle of the soil pile mixed with the soil stabilizing liquid agent, a soil powder solidifying agent of a corresponding mass ratio is placed into the pit, and the soil pile and the soil powder solidifying agent are fully mixed by the excavator or loader.

[0140] When the amount of raw materials used in the improved adobes for each part is greatly different, the above-mentioned method can be used to prepare the improved adobes. This method is to prepare the four improved adobes separately. It is particularly suitable when engineering efficiency is prioritized, and can avoid the improved adobes from solidifying during the construction process.

[0141] Construction of retaining wall foundation part 4: The improved adobe required for construction of retaining wall foundation part 4 is placed in the foundation trench 11, and the improved adobe is compacted. After the improved adobe is solidified, the construction of the retaining wall foundation is completed, which specifically includes the following steps:

[0142] S31, flattening and compacting the bottom of the foundation trench 11;

[0143] S32, using an excavator or a loader to spread the corresponding improved adobe in layers into the foundation trench 11; the thickness of each layer is controlled to be 0.3m, and the improved adobe is compacted by a flat hydraulic vibration rammer installed at the arm end of the excavator, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 5 times;

[0144] S33, the height of the adobe to be improved is flush with the notch of the foundation trench 11, and a 20-ton roller is used for rolling, and the rolling process includes 3 static rolling and 4 vibration rolling;

[0145] S34, waiting for the improved adobe to solidify.

[0146] According to the height of the retaining wall main surface 7 recorded in step S22, it is necessary to build a geobag retaining layer 9. Based on this, building the retaining wall main part 3 includes the following steps:

[0147] S41, constructing a geobag retaining layer 9 on the retaining wall main surface 7 of the slope 8, and then spreading the improved adobe used for constructing the retaining wall main part 3 on the surface of the geobag retaining layer 9 with a thickness of 0.5 or 0.8 m, wherein constructing the geobag retaining layer 9 includes the following steps;

[0148] S41-1, prepare enough geobags, and put the modified adobe used for constructing the main part 3 of the retaining wall into the geobags;

[0149] S41-2, paving the geobags filled with improved adobe in a staggered manner with a thickness of 0.5m or 0.8m on the main surface 7 of the retaining wall of the slope 8;

[0150] S41-3, compact the surface of the laid geobag layer with a flat hydraulic vibration rammer. The vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted twice;

[0151] S41-4, measuring the thickness of the laid geobags; if the target thickness of the geobag retaining layer 9 has been reached, inserting a plurality of reinforcements 10 vertically to the surface of the geobag retaining layer 9, thus completing the construction of the geobag retaining layer 9; if the target thickness of the geobag retaining layer 9 has not been reached, continuing to lay new geobags on the surface of the laid geobag layer in an alternating manner according to a thickness of 0.5m-0.8m, and then returning to step S41-3;

[0152] S42, compacting the surface of the improved adobe layer using a flat hydraulic vibration rammer installed at the arm end of the excavator, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 5 times;

[0153] S43, compacting the side of the improved adobe layer using a flat hydraulic vibration rammer, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 5 times;

[0154] S44, measure the thickness of the improved adobe that has been spread; if the target thickness of the main part of the earth wall has been reached, stop spreading the improved adobe and wait for the improved adobe to solidify; if the target thickness of the main part of the earth wall has not been reached, continue to spread new improved adobe on the surface of the spread improved adobe layer at a thickness of 0.5m, and then return to step S42. Furthermore, before spreading new improved adobe, it is necessary to perform a roughening operation on the surface of the spread improved adobe layer. As a construction method, roughening is now mainly used for tiling tiles, because tiling tiles on smooth walls is not very safe and firm. Therefore, roughening treatments such as using a cutting machine to cut many grooves on the wall, using a broom to dip in cement slurry water to beat the wall, and high-pressure water roughening are used to increase the firmness of the tile. In this technical solution, if the surface of a certain improved adobe layer is too dry, water spraying is used to keep it moist to ensure the tightness of the connection between each layer.

[0155] Construction of slope protection part 2: Place the improved adobe required for construction of slope protection part 2 on the slope protection surface 6 of the slope 8, and compact the improved adobe. Specifically, use a flat hydraulic vibration rammer to compact the surface of slope protection part 2 at a frequency of 2000 vibrations per minute, and compact each area 2-5 times back and forth. When the rammer is constructed in two adjacent areas, the overlapping width of the construction area is controlled at 100-120mm; in addition, the corners of slope protection part 2 should be compacted with an artificial frog-type rammer, and the number of back and forth rammers for each area should not be less than 3 times. After the improved adobe is solidified, the construction of slope protection part 2 is completed.

[0156] Construction of the slope top crack repair part 1: fill the cracks of the slope top crack repair surface 5 with the improved adobe required for constructing the slope top crack repair part 1, and smooth and compact the surface of the cracks filled with the improved adobe. After the improved adobe is solidified, the construction of the slope top crack repair part 1 is completed, wherein the smoothing and compacting operation on the surface of the cracks filled with the improved adobe can be carried out by using a manual vertical tamping machine.

Claims

1. A slope retaining structure based on original soil solidification, characterized in that: The invention comprises a slope top crack repairing part (1), a slope protection part (2), a retaining wall main part (3) and a retaining wall foundation part (4) made of improved adobe as raw materials; the surface of the slope (8) is provided with a slope top crack repairing surface (5), a slope protection surface (6) and a retaining wall main part (7) corresponding to the top crack repairing part, the slope protection part (2) and the retaining wall main part (3); and the slope top crack repairing surface (5), the slope protection surface (6) and the retaining wall main part (7) are connected in sequence from top to bottom; the retaining wall foundation part (4) is arranged at the bottom of the retaining wall main part (3) and embedded in the ground; The improved adobe used in the retaining wall foundation part (4) and the retaining wall main body part (3) is a mixture of original soil with 2%-3% of a soil stabilizing liquid agent and 5%-12% of a soil powder curing agent added to the original soil by mass ratio; The improved adobe used in the slope protection part (2) and the slope top crack repair part (1) is a mixture of original soil with 2%-3% of a soil stabilizing liquid agent and 3%-8% of a soil powder curing agent added to the original soil by mass; The soil stabilizing liquid agent includes the following components in a mass ratio: 20%-35% of waterborne epoxy resin, 4%-8% of isocyanate, 0.1%-2% of lignin fiber, 15%-23% of neutral water glass, 10%-18% of acrylamide, 0.8%-3% of sodium polycarboxylate, 1%-2% of polyanionic cellulose, 0.2%-0.4% of magnesium oxide powder and 150%-200% of water; The powdered soil solidifier comprises the following components in mass ratio: 20%-41% potassium chloride, 4%-10% sodium sulfide, 3%-7% magnesium chloride, 16%-26% calcium chloride, 3%-5% polyanionic cellulose, and 0.3%-2% fixed sulfur ash.

2. A slope retaining structure based on original soil solidification as claimed in claim 1, characterized in that: The height of the retaining wall main surface (7) is h≤10m, the slope of the retaining wall main surface (7) is a≤70°, and the horizontal cross-sectional thickness of the retaining wall main part (3) is b; the retaining wall main part (3) and the retaining wall main surface (7) of the slope (8) have the following relationship: When h≤5m, within the range of a≤70°, 0.3h≤b≤0.5h; when 5m<h≤10m, a geobag retaining layer (9) is provided between the retaining wall main body (3) and the slope (8), and the cross-sectional thickness of the geobag retaining layer (9) is n; When 5m<h≤7m, if a≤50°, then 0.2m≤b≤0.4m and 0.6m≤n≤0.7m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.6m≤n≤0.7m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1m≤n≤1.2m; When 7m<h≤10m, if a≤50°, then 0.3m≤b≤0.4m and 0.7m≤n≤0.8m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.8m≤n≤0.1m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1.2m≤n≤1.4m.

3. A slope retaining structure based on original soil solidification as claimed in claim 2, characterized in that: A reinforcement (10) connection structure is provided between the geobag retaining layer (9) and the retaining wall main body (3).

4. A slope retaining structure based on original soil solidification as claimed in claim 3, characterized in that: The height of the retaining wall foundation part (4) is d, and 0.4m≤d≤1.5m; the depth of the retaining wall foundation part (4) embedded in the ground is d; the width of the retaining wall foundation part (4) is L; when h≤5m, L=b+k, when 5m<h≤10m, L=n+b+k; wherein 0.3m≤k≤0.5m.

5. A construction method for a slope retaining structure, characterized in that: It includes foundation construction and excavation of original soil, preparation of improved adobe, construction of retaining wall foundation part (4), construction of retaining wall main part (3), construction of slope protection part (2), construction of slope top crack repair part (1); The foundation construction and excavation of the original soil include the following steps: S11, according to the current structure of the slope (8), the surface structure of the slope (8) is repaired by using an excavator and / or manually digging the original soil, and the top crack repair surface (5), the slope protection surface (6), and the retaining wall main surface (7) on the surface of the slope (8) are determined, and the height h of the retaining wall main surface (7) is ≤10m and the slope a is ≤70°; S12, recording the height h and slope a of the retaining wall main surface (7), and determining the construction dimensions of the retaining wall main portion (3) and the retaining wall foundation portion (4) according to the height h and slope a of the retaining wall main surface (7), including the horizontal cross-sectional thickness b of the retaining wall main portion (3) and the width L of the retaining wall foundation portion (4); S13, using an excavator and / or manual digging to dig out the original soil to open a foundation trench (11) with a width of L and a depth of d at the bottom of the main surface (7) of the retaining wall, wherein 0.4m≤d≤1.5m; S14, piling the original soil obtained in step S11 and step S12 in a field prepared in advance; S15, preliminarily estimating the amount of original soil required for the retaining structure currently under construction, and determining whether the amount of original soil in the field meets the construction requirements of the current retaining structure; if so, preparing improved adobes; if not, digging original soil of the same quality as the slope (8) from a location no more than 500 meters away from the slope (8) and putting it in the field, and after the amount of original soil in the field meets the construction requirements of the current retaining structure, preparing improved adobes; The preparation of improved adobe comprises: preparing a soil stabilizing liquid agent and a soil powder curing agent required for preparing the improved adobe; mixing the soil stabilizing liquid agent at a mass ratio of 2%-3% to the original soil and the soil powder curing agent at a mass ratio of 5%-12% to the original soil with the original soil to prepare the improved adobe required for the retaining wall foundation part (4) and the retaining wall main part (3); mixing the soil stabilizing liquid agent at a mass ratio of 2%-3% to the original soil and the soil powder curing agent at a mass ratio of 3%-8% to the original soil with the original soil to prepare the improved adobe required for the slope protection part (2) and the slope top crack repair part (1); wherein the soil stabilizing liquid agent comprises the following substances: The ingredients in mass ratio are: 20%-35% water-based epoxy resin, 4%-8% isocyanate, 0.1%-2% lignin fiber, 15%-23% neutral water glass, 10%-18% acrylamide, 0.8%-3% sodium polycarboxylate, 1%-2% polyanionic cellulose, 0.2%-0.4% magnesium oxide powder and 150%-200% water; the soil powder curing agent includes the following ingredients in mass ratio: 20%-41% potassium chloride, 4%-10% sodium sulfide, 3%-7% magnesium chloride, 16%-26% calcium chloride, 3%-5% polyanionic cellulose, 0.3%-2% sulfur-fixing ash; The construction of the retaining wall foundation part (4): placing the improved adobe required for the construction of the retaining wall foundation part (4) in the foundation groove (11), and compacting the improved adobe. After the improved adobe is solidified, the construction of the retaining wall foundation is completed; The construction of the retaining wall main part (3): according to the planning of the retaining wall main part (3) in step S12, the improved adobe required for the construction of the retaining wall main part (3) is placed on the retaining wall main surface (7) of the slope (8), and the improved adobe is compacted. After the improved adobe is solidified, the construction of the retaining wall main part (3) is completed; The construction of the slope protection part (2): placing the improved adobe required for the construction of the slope protection part (2) on the slope protection surface (6) of the slope (8), and compacting the improved adobe. After the improved adobe is solidified, the construction of the slope protection part (2) is completed; The construction of the slope top crack repair part (1) is as follows: the cracks of the slope top crack repair surface (5) are filled with improved adobe required for the construction of the slope top crack repair part (1), and the surface of the cracks filled with the improved adobe is smoothed and compacted. After the improved adobe is solidified, the construction of the slope top crack repair part (1) is completed.

6. A construction method for a slope retaining structure as claimed in claim 5, characterized in that: In the process of preparing the improved adobe, mixing the soil stabilizing liquid agent and the soil powder curing agent with the original soil in the field includes the following steps: S21, piling up all the original soil in the field into a soil pile, and using an excavator or a loader to dig a soil pit in the middle of the soil pile; S22, putting a soil stabilizing liquid agent in a mass ratio of 2% to 3% of the original soil into the soil pit, and using an excavator or a loader to fully mix the original soil and the soil stabilizing liquid agent; S23, dividing the original soil mixed with the soil stabilizing liquid agent into two soil piles, and using an excavator or a loader to dig a soil pit between the two soil piles; S24, put a soil powder solidifier in a ratio of 5%-12% of the original soil mass to the pit of one of the soil piles, put a soil powder solidifier in a ratio of 3%-8% of the original soil mass to the pit of the other soil pile, and use an excavator or loader to fully mix the two soil piles with the soil powder solidifier.

7. A construction method for a slope retaining structure as claimed in claim 5, characterized in that: The construction of the retaining wall foundation part (4) comprises the following steps: S31, flattening and compacting the bottom of the foundation trough (11); S32, using an excavator or a loader to spread the corresponding improved adobe in layers into the foundation trench (11); the thickness of each layer is controlled to be 0.2m-0.4m, and the improved adobe is compacted using a flat hydraulic vibration rammer installed at the end of the excavator arm, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 4-5 times; S33, the height of the adobe to be improved is flush with the notch of the foundation trench (11), and a 18-22 ton roller is used for rolling, and the rolling process includes static rolling 2-3 times and vibration rolling 3-4 times; S34, waiting for the improved adobe to solidify.

8. The construction method of a slope retaining structure according to claim 5, characterized in that: In the step S12, when h≤5m, within the range of a≤70°, 0.3h≤b≤0.5h, L=b+k, 0.3m≤k≤0.5m; when 5m<h≤10m, a geobag retaining layer (9) is provided between the retaining wall main body (3) and the slope (8), and the cross-sectional thickness of the geobag retaining layer (9) is n, L=n+b+k; When 5m<h≤7m, if a≤50°, then 0.2m≤b≤0.4m and 0.6m≤n≤0.7m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.6m≤n≤0.7m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1m≤n≤1.2m; When 7m<h≤10m, if a≤50°, then 0.3m≤b≤0.4m and 0.7m≤n≤0.8m; if 50°<a≤60°, then 0.4m≤b≤0.5m and 0.8m≤n≤0.1m; if 60°<a≤70°, then 0.5m≤b≤0.6m and 1.2m≤n≤1.4m.

9. A construction method for a slope retaining structure as claimed in claim 8, characterized in that: The construction of the retaining wall main part (3) comprises the following steps: S41, based on the recorded result in step S22, determining whether it is necessary to construct a geobag retaining layer (9); if it is not necessary to construct a geobag retaining layer (9), directly spreading the improved adobe used for constructing the main part (3) of the retaining wall on the main surface (7) of the retaining wall of the slope (8) at a thickness of 0.5-0.8 m; if it is necessary to construct a geobag retaining layer (9), construct a geobag retaining layer (9) on the main surface (7) of the retaining wall of the slope (8), and then spreading the improved adobe used for constructing the main part (3) of the retaining wall on the surface of the geobag retaining layer (9) at a thickness of 0.5-0.8 m; S42, compacting the surface of the improved adobe layer using a flat hydraulic vibration rammer installed at the end of the excavator arm, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 4-6 times; S43, compacting the side of the improved adobe layer using a flat hydraulic vibration rammer, the vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 4-6 times; S44, measure the thickness of the improved adobe that has been spread; if the target thickness of the main part of the earth wall has been reached, stop spreading the improved adobe and wait for the improved adobe to solidify; if the target thickness of the main part of the earth wall has not been reached, continue to spread new improved adobe on the surface of the spread improved adobe layer at a thickness of 0.5-0.8m, and then return to step S42.

10. A construction method for a slope retaining structure as claimed in claim 9, characterized in that: In step S41, constructing the geobag retaining layer (9) comprises the following steps: S41-1, prepare enough geobags and fill the geobags with modified adobe used to construct the main part of the retaining wall (3); S41-2, paving the geobags filled with improved adobe in a staggered manner with a thickness of 0.5-0.8 m on the main surface (7) of the retaining wall of the slope (8); S41-3, compact the surface of the laid geobag layer with a flat hydraulic vibration rammer. The vibration frequency of the flat hydraulic vibration rammer is 2000 times / minute, and each layer is compacted back and forth 1-2 times; S41-4, measure the thickness of the laid geobags; if the target thickness of the geobag retaining layer (9) has been reached, insert a number of reinforcements (10) vertically to the surface of the geobag retaining layer (9), thus completing the construction of the geobag retaining layer (9); if the target thickness of the geobag retaining layer (9) has not been reached, continue to lay new geobags on the surface of the laid geobag layer in an alternating manner at a thickness of 0.5-0.8m, and then return to step S41-3.

Images