High fill slope quickly reinforced by polymer grouting and its construction method

Abstract

The present application relates to a high fill slope that is rapidly reinforced by polymer grouting and a construction method thereof. The scheme includes the following construction steps: S00, determine the construction area, and level the site to the design elevation; S10, the sliding surface with the smallest stability coefficient meets the design requirements; S20, after the gravel area is backfilled, it needs to be rolled and compacted together with the fill soil; S30, gabion stone cages are constructed on each level of the slope; S40, platforms and drainage ditches are constructed between two adjacent levels of the slope; S50, steps S10 to S40 are cycled until the top of the slope is constructed; S60, the concrete surface layer of the top of the slope is poured to complete the construction, and then the polymer grouting reinforcement of the fill slope is entered; S70, polymer grouting is performed on the gravel area as needed to form a fill slope with fill soil as the filler and the polymer grouting gravel area as the reinforcement body. The present application can avoid the shallow sliding and collapse of the backfill slope and improve the stability coefficient of the deep sliding of the slope.

Description

Technical Field

[0001] The present application relates to the technical field of civil engineering, and in particular to a high fill slope quickly reinforced by polymer grouting and a construction method thereof. Background Art

[0002] The problem of high filling and deep excavation in mountainous areas is difficult to avoid. In order to ensure the stability of high filling slopes during construction, conventional filling projects generally use slope reduction, reinforced earth retaining walls, or large retaining structures such as anti-slide piles. However, conventional slope reduction has a relatively slow slope rate and occupies a large area; reinforced earth retaining walls, as a flexible retaining structure, have relatively large deformation and uneven construction quality; large retaining structures such as anti-slide piles have defects such as high cost, complex construction, and long period. Summary of the invention

[0003] The purpose of the present application is to address the above-mentioned problems existing in the prior art and to provide a high fill slope quickly reinforced by polymer grouting and a construction method thereof.

[0004] In order to achieve the above application purpose, this application adopts the following technical solution: The high fill slope construction method for rapid reinforcement by polymer grouting includes the following construction steps:

[0005] S00. Determine the construction area and level the site to the designed elevation;

[0006] S10. Based on the limit equilibrium theory, backfill gravel is used to backfill part of the first floor, and the stability analysis of the high fill slope formed by backfill is performed to obtain the intersection coordinates with the first floor;

[0007] Simulate the burial of a gravel area in the intersection of two sliding zones with the smallest stability coefficient, record the intersection coordinates of the new most potentially dangerous rupture surface and the next layer, and mark and stake out;

[0008] Continuously add gravel areas to the newly generated sliding zone, and calculate the stability coefficient after adding the gravel area and the polymer grouting gravel area and the corresponding new sliding surface position, and repeat the operation until the sliding surface with the smallest stability coefficient also meets the design requirements;

[0009] S20. After the gravel area is backfilled, it needs to be compacted together with the conventional fill soil;

[0010] S30. Carry out gabion stone cage construction on slopes at all levels;

[0011] S40, construct the platform and drainage ditch between two adjacent slopes;

[0012] S50, looping steps S10 to S40 until the construction reaches the top of the slope;

[0013] S60, pouring the concrete surface layer on the top of the slope to complete the construction of the fill slope;

[0014] S70. Perform polymer grouting on the gravel area as needed. According to the markings and layout of each gravel area, follow the principle of proximity and drill holes from the slope surface or top to the nearest gravel area for grouting to form a fill slope with backfill as the filling material and the polymer grouting gravel area as the reinforcement body.

[0015] Furthermore, in step S70, the shear strength parameters of the crushed stone and the shear strength parameters of the crushed stone reinforced with polymers having different grouting amounts are obtained in advance through geotechnical tests;

[0016] Then, according to the slope stability coefficient requirements, gravel areas of different sizes are set and different polymer grouting amounts are used.

[0017] Furthermore, when the first layer is backfilled with crushed stones, except for the area backfilled with crushed stones, the remaining area is backfilled with soil.

[0018] Furthermore, in step S10, the gravel area is backfilled continuously along the axial direction of the slope, and settlement joints are set.

[0019] Furthermore, in step S10, during the rolling and compacting step of the gravel area, the compaction degree of the rolled area is tested, and the area is continuously re-rolled until the compaction degree reaches the design requirement.

[0020] Furthermore, the filler layer thickness is 500 mm and the compaction coefficient is not less than 0.95.

[0021] Further, in step S30, the specific steps of constructing gabion cages on slopes at all levels are as follows:

[0022] Measure and lay out the gabion cages in staggered positions on the leveled slopes;

[0023] Stand up the four sides of the gabion cage and lock the adjacent edges with binding wires. When locking, twist the binding wires spirally around two overlapping frame wires or the double-twisted edges of the frame wire and the cage.

[0024] Fill the gabion cage with rocks;

[0025] After the gabion cage is filled with stones, the top cover is put down, and then the two overlapping frame wires are tightened spirally with binding wire;

[0026] Fine-grained clay soil is spread on the built gabion cages to facilitate grass planting.

[0027] Furthermore, in step S10, the automatic positioning and searching for the most dangerous sliding surface method of SLOPE / W in GeoStudio is used, the analysis type is Morgenstern-Price, and the inter-strip force function is a half-sine function, to perform stability analysis on the high slope formed by backfilling.

[0028] Furthermore, the width of each platform is 1.5 to 2.5 m.

[0029] The high fill slope rapidly reinforced by polymer grouting is obtained by the high fill slope rapidly reinforced by polymer grouting construction method mentioned above.

[0030] Compared with the prior art, this application has the following beneficial effects:

[0031] 1. This application makes full use of the filling slope construction process, conveniently sets a high-strength gravel area at any position inside the slope of the fill slope, directly interrupts the potential sliding surface in a more targeted manner, improves the slope stability coefficient, and can also increase the slope rate, save land, and avoid concentrating all reinforcement measures on the slope foot in the conventional support scheme of the fill slope, avoiding the long construction period and difficulty of conventional large-scale anti-sliding piles, and avoiding the use of reinforced earth retaining walls whose construction quality control is relatively difficult, thereby providing the first guarantee for the stability of the fill slope.

[0032] 2. This application uses quick-setting polymer to carry out grouting reinforcement on the marked and staked gravel area. It can be precisely guided, and the grouting amount and grouting effect can be controlled. It can quickly improve the strength of the gravel area. The reinforcement effect is immediate, providing a second guarantee for the stability of the fill slope, and is also suitable for emergency rescue of the fill slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the fill slope structure in this application;

[0034] Figure 2 It is a schematic diagram of the structure of the drainage ditch in this application;

[0035] Figure 3 It is a schematic diagram of the gabion stone cage in this application;

[0036] Figure 4 This is the stability coefficient and the most dangerous rupture surface diagram (unreinforced high fill slope) calculated by SLOPE / W in GeoStudio in this application;

[0037] Figure 5 This application uses SLOPE / W in GeoStudio to calculate the stability coefficient and the most dangerous rupture surface diagram (high fill slope with gravel area);

[0038] Figure 6This application uses SLOPE / W in GeoStudio to calculate the stability coefficient and the most dangerous rupture surface diagram (high fill slope after polymer grouting in the gravel area).

[0039] In the figure, 1. original slope; 2. top of slope; 3. side slope; 4. platform; 5. backfill; 6. last side slope; 20. drainage ditch; 30. gabion stone cage; 31. gabion stone cage cover; 32. built-in partition; 33. side joint edge; 40. gravel area; 41. polymer grouting gravel area. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0041] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0042] Example 1

[0043] like Figure 1-3 As shown, the high fill slope construction method for rapid reinforcement by polymer grouting includes the following construction steps:

[0044] S00. Determine the construction area and level the site to the designed elevation;

[0045] S10, determine the intersection coordinates of the potential most dangerous fracture surface and the first layer and mark and stake out; fill gravel in a certain size area of ​​the first layer, and fill soil in other areas. Since the initially determined potential most dangerous fracture surface will pass through the gravel area with higher strength, the slope stability coefficient will increase accordingly, the potential most dangerous fracture surface will change, bypass the gravel area, and form a new potential most dangerous fracture surface. Record the intersection coordinates of the new potential most dangerous fracture surface and the second layer and mark and stake out; after the gravel area is backfilled in the second layer, the slope stability coefficient will increase again, the potential most dangerous fracture surface will change again, bypass the gravel area, and form a new potential most dangerous fracture surface. Record the intersection coordinates of the new potential most dangerous fracture surface and the third layer and mark and stake out; and so on, until the stability coefficient of the fill slope meets the requirements. It is also possible not to backfill the gravel area 40 layer by layer, but to set a gravel area 40 every one or several layers, as long as the final slope stability coefficient can meet the design requirements.

[0046] In this embodiment, the calculation of the most dangerous potential rupture surface can be determined by computing software, which is a prior art. Based on the limit equilibrium theory, the automatic positioning search method of the most dangerous sliding surface of SLOPE / W in GeoStudio is used, the analysis type is Morgenstern-Price, and the inter-strip force function is a half-sine function. The stability analysis of the high slope 3 formed by backfilling is performed, and a gravel area 40 is buried in the intersection area of ​​the two sliding belts with the smallest stability coefficient, and then the gravel area 40 is continuously added to the newly generated sliding surface until the stability coefficient of the most dangerous sliding surface meets the design requirements.

[0047] Among them, SLOPE / W is a module in GeoStudio software, which is used for the analysis of stable slopes. This module can help engineers and geologists conduct slope stability assessments, evaluate possible landslide or rockfall risks, and design related earthworks or other civil engineering projects. The SLOPE / W module uses finite element analysis technology and modern stability analysis methods to calculate the stability of slopes, taking into account the characteristics of different types of soil and rock, including their strength, friction angle, permeability and other factors. By using the SLOPE / W module, users can evaluate the effects of different slope geometries, soil or rock characteristics, and additional loads on slope stability, and make appropriate designs and improvements.

[0048] Among them, the method of automatically locating and searching for the most dangerous sliding surface is a method of automatically searching for the most unstable sliding surface position and inclination by performing finite element analysis on the slope and calculating the stability index on the sliding surface at different positions and inclinations.

[0049] In the Morgenstern-Price model, it is assumed that the soil is a continuous medium, which is subject to gravity in an equilibrium state and has an elastic stress field and a plastic strain field. A half-sine function is used as the inter-strip force function, which represents the relationship between the shear stress and normal stress of the soil at the horizontal interval.

[0050] When performing stability analysis with SLOPE / W, users need to define the geometry of the slope, the physical and mechanical properties of the soil and rock, and other loading and boundary conditions. Users can then use the automatic location search method to calculate the stability of the slope and obtain results on the location, inclination, and stability coefficient of the most unstable sliding surface. These results can help users evaluate the stability of the slope and design and improve it as needed.

[0051] After S20 and the gravel area 40 are backfilled, they need to be rolled and compacted together with the fill soil;

[0052] S30, construct gabion cages 30 on slopes at all levels;

[0053] In this embodiment, the specific construction method is:

[0054] 1) Measure and lay out, and stagger the gabion cages 30 on the leveled slopes at all levels. After all the gabion cages 30 are installed in place, start filling with stones to prevent deformation. The height difference between the filling stones of two adjacent gabion cages 30 should not be greater than 35cm.

[0055] 2) Place the gabion cage 30 to avoid longitudinal through seams, stand up the four sides of the gabion cage 30, and lock the adjacent edges with binding wires. When locking, tighten the binding wires spirally around two overlapping frame wires or the double twisted edges of the frame wire and the cage, with a pitch of no more than 50 mm;

[0056] When installing gabion gabions 30 on the completed bottom mesh, use binding wires along the lower frame of the newly installed gabion gabions 30 to fix it on the bottom mesh. Adjacent gabions on the same layer should also be tied together with binding wires to connect the gabions into one.

[0057] 3) Stone filling: The particle size of the filling stone should be between 10 and 25 cm. It should be solid and dense, with strong resistance to weathering. The size should be reasonably matched to achieve the porosity and exposed stones required by the design. The stones should be manually laid flat to obtain a beautiful surface and prevent water from flowing away from the mesh to ensure the straight shape of the gabion stone cage 30 mesh.

[0058] 4) Close the gabion cage cover 31, fill the gabion cage 30 with stones and then cover it. Then use binding wire to tighten the two overlapping frame wires in a spiral shape with a pitch of no more than 50 mm. Fill the built gabion cage 30 with fine-grained clay soil for planting grass.

[0059] The gabion stone cage 30 includes a gabion stone cage upper cover 31 , a built-in partition 32 and a side joint edge 33 .

[0060] S40, constructing the platform 4 and the drainage ditch 20 between two adjacent slopes 3;

[0061] In this embodiment, the height of each level of the side slope 3 between the slope top 2 and the last level of the side slope 6 is 6-8 m, and two adjacent levels of the side slope 3 are transitioned through a poured concrete platform 4, and the width of each level of the platform 4 is 1.5-2.5 m.

[0062] S50, looping steps S10 to S40 until the construction reaches the top 2 of the slope;

[0063] S60, pouring the concrete surface layer of the slope top 2 to complete the construction.

[0064] S70. The strength of the gravel area is higher than that of the fill, which can provide some help to enhance the stability of the slope. However, in order to further and quickly improve the stability of the slope, polymer grouting can be performed on the gravel area 40 as needed. According to the marking and setting of each gravel area 40, following the principle of proximity, a hole is drilled from the slope surface or the top of the slope to the nearest gravel area 40, and a high-expansion polymer slurry with rapid setting and high expansion is injected under high pressure. The slurry solidifies rapidly, and the originally discrete gravels are cemented together, further improving the strength of the gravel area 40. The amount of polymer grouting can be determined according to the results of indoor geotechnical tests of gravel strength parameters under different grouting amounts. Since the pores of the gravel are relatively large, the rapid setting, high-pressure, and high-expansion polymer slurry can quickly and evenly penetrate each gravel area 40, and the fill outside the gravel area can be equivalent to the isolation layer of the polymer slurry due to its relatively small pores. Finally, a fill slope with fill as the filler and the polymer grouting gravel area 41 as the reinforcement is formed.

[0065] In this embodiment, the shear strength parameters of crushed stone and the crushed stone reinforced with polymer with different grouting amounts can be obtained in advance through geotechnical tests, and then crushed stone areas of different sizes are set and different polymer grouting amounts are used according to the requirements of the slope stability coefficient.

[0066] Example 2

[0067] The high fill slope rapidly reinforced by polymer grouting is obtained by the high fill slope rapidly reinforced by polymer grouting construction method of Example 1.

[0068] In this embodiment, the fill slope structure after construction is 115m high, including the top 2, the last slope 6, the slopes 3 between the top 2 and the last slope 6, the platform 4 between the two slopes 3, the gabion stone cage 30, the gravel area 40, the polymer grouting gravel area 41, the backfill soil 5, the original slope 1, the drainage ditch 20, the height of each slope 3 is 7m, the slope rate of each level is 1:1.5, and the slope surface of each slope 3 is provided with a gabion stone cage 30.

[0069] Preferably, a drainage ditch 20 is provided in each platform 4, and the depth of the drainage ditch 20 is about 25 cm. The height of each level of slope 3 between the top 2 and the last level of slope 6 is 6 to 8 m, and two adjacent levels of slope 3 are transitioned through the poured concrete platform 4, and the width of each level of platform 4 is 1.5 to 2.5 m.

[0070] Use SLOPE / W in GeoStudio to calculate the most dangerous fracture surface of the slope. Figure 4-6 The results show that Figure 4 Unreinforced high fill slope: stability coefficient = 1.025, in an understable state; Figure 5 The high fill slope in the gravel area: stability coefficient = 1.160, which is in a basically stable state; Figure 6 The high fill slope after polymer grouting in the gravel area: the stability coefficient = 1.389, in a stable state. Among them, the fill shear strength parameters are cohesion c = 20kPa, internal friction angle φ = 25°; crushed stone cohesion c = 0kPa, internal friction angle φ = 40°; according to previous test experience, the cohesion of coarse-grained soil after polymer grouting reinforcement can be increased by more than 400kPa, while the internal friction angle does not change much. Therefore, in this example, the cohesion of polymer grouting crushed stone is conservatively taken as c = 300kPa, and the internal friction angle φ = 40°.

[0071] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0072] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0073] Although the present invention uses the terms such as original slope 1, slope top 2, slope 3, platform 4, backfill 5, final slope 6, drainage ditch 20, gabion gabion cage 30, gabion gabion cage cover 31, built-in partition 32, side junction 33, crushed stone area 40, polymer grouting crushed stone area 41, etc. more frequently, it does not exclude the possibility of using other terms. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present application; interpreting them as any additional restrictions is contrary to the spirit of the present application.

[0074] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present application. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the protection scope of the present application.

Claims

1. A high fill slope construction method for rapid reinforcement by polymer grouting, characterized in that: The construction steps include: S00. Determine the construction area and level the site to the designed elevation; S10. Based on the limit equilibrium theory, backfill gravel is used to backfill part of the ground floor, and the stability analysis of the high fill slope formed by backfill is performed to obtain the intersection coordinates with the ground floor; Simulate the burial of a gravel area in the intersection of two sliding zones with the smallest stability coefficient, record the intersection coordinates of the new most potentially dangerous rupture surface and the next layer, and mark and stake out; Continuously add gravel areas to the newly generated sliding zone, and calculate the stability coefficient after adding the gravel area and the polymer grouting gravel area and the corresponding new sliding surface position, and repeat the operation until the sliding surface with the smallest stability coefficient also meets the design requirements; S20. After the gravel area is backfilled, it needs to be rolled and compacted together with the fill soil; S30. Carry out gabion stone cage construction on slopes at all levels; S40, construct platforms and drainage ditches between two adjacent slopes; the width of each platform is 1.5~2.5m; S50, looping steps S10 to S40 until the construction reaches the top of the slope; S60, pouring the concrete surface layer on the top of the slope to complete the construction of the fill slope; S70, polymer grouting is performed on the gravel area as needed, and according to the markings and layout of each gravel area, following the principle of proximity, drilling holes from the slope surface or the top of the slope to the nearest gravel area for grouting, so as to form a fill slope with fill soil as the filling material and the polymer grouting gravel area as the reinforcement body; In step S70, the shear strength parameters of the crushed stone and the shear strength parameters of the crushed stone reinforced with polymers having different grouting amounts are obtained in advance through geotechnical tests; Then, according to the slope stability coefficient requirements, gravel areas of different sizes are set and different polymer grouting amounts are used.

2. The high fill slope construction method for rapid reinforcement by polymer grouting according to claim 1 is characterized in that: In step S10, when the first layer is backfilled with crushed stones, except for the area backfilled with crushed stones, the remaining area is backfilled with soil.

3. The high fill slope construction method for rapid reinforcement by polymer grouting according to claim 1 is characterized in that: In step S10, the gravel area is backfilled continuously along the axial direction of the slope, and settlement joints are set.

4. The high fill slope construction method for rapid reinforcement by polymer grouting according to any one of claims 1 to 3, characterized in that: In step S10, during the rolling and compacting step of the gravel area, the compaction degree of the rolled area is tested, and the area is continuously re-rolled until the compaction degree reaches the design requirement.

5. The high fill slope construction method for rapid reinforcement by polymer grouting according to claim 4 is characterized in that: The filler layer thickness is 500mm and the compaction coefficient is not less than 0.

95.

6. The high fill slope construction method for rapid reinforcement by polymer grouting according to claim 1 is characterized in that: In step S30, the specific steps for constructing gabion cages on slopes at all levels are as follows: Measure and lay out the gabion cages in staggered positions on the leveled slopes; Stand up the four sides of the gabion cage and lock the adjacent edges with binding wires. When locking, twist the binding wires spirally around two overlapping frame wires or the double-twisted edges of the frame wire and the cage. Fill the gabion cage with rocks; After the gabion cage is filled with stones, the top cover is put down, and then the two overlapping frame wires are tightened spirally with binding wire; Fine-grained clay soil is spread on the built gabion cages to facilitate grass planting.

7. The high fill slope construction method for rapid reinforcement by polymer grouting according to claim 1 is characterized in that: In step S10, the automatic positioning and searching method of the most dangerous sliding surface of SLOPE / W in GeoStudio is used, the analysis type is Morgenstern-Price, and the inter-strip force function is a half-sine function, and the stability analysis of the high slope formed by backfill is performed.

8. Rapid reinforcement of high fill slope by polymer grouting, characterized in that: The high fill slope is obtained by the high polymer grouting rapid reinforcement construction method described in any one of claims 1 to 7.

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