Simple combined filling retaining wall construction method

Abstract

The application discloses a simple combined filling retaining wall construction method, which comprises the following steps: firstly, constructing short anchor rods and reinforcing bars and other components at the lower part of the two sides of a connecting roadway of a mining field; then, piling up waste rock at the lower part of the waste rock pile and carrying out first filling of the mining field; then, forming a sandbag wall by using sandbags as filling slurry on the waste rock pile and carrying out second filling of the mining field; finally, forming a waste rock masonry wall by using waste rock and cement mortar on the sandbag wall and carrying out third filling of the mining field, and the height of the waste rock pile, the sandbag wall and the waste rock masonry wall is 1 / 3 of the net height of the connecting roadway. The application has the advantages of simple construction process, short construction period, low cost, strong bearing capacity of the filling retaining wall, and the like, and the filling retaining wall is formed in several times, which is beneficial to observing the filling condition of the mining field and improving the filling quality of the mining field.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of underground mining filling, and particularly relates to a simple combined filling retaining wall construction method. BACKGROUND

[0002] When filling method is used for stoping, the construction of filling retaining wall is needed before the stope is filled. Common construction methods include masonry method, steel-wood splicing method, waste rock piling method, etc. The masonry method is further divided into brick masonry method, reinforced concrete construction method, and water-permeable brick masonry method. Regardless of which construction method is used, the construction material needs to be transported to the working face in advance, which consumes labor and material and has a relatively high cost. In addition, the labor intensity of workers is high, and the leakage of slurry may occur due to unstrict construction, which may even lead to the collapse of the retaining wall. The wooden retaining wall has small strength and is easy to collapse, causing the loss of slurry. The brick retaining wall has large material transportation volume and high labor intensity. The concrete retaining wall has high cost and long maintenance period. The construction process of the steel-reinforced flexible retaining wall is complex, and the quality is difficult to guarantee. These factors greatly affect the construction speed and quality of the retaining wall, and limit its application.

[0003] Patent No. ZL201110056097.4 discloses a filling retaining wall constructed by using tunneling waste rock and a construction method thereof. The tunneling waste rock is transported to the preset position of the retaining wall by a shovel-truck and is piled to form a waste rock retaining wall. Compared with the traditional construction method, the speed is faster, but the overall strength of the filling body cannot be guaranteed, the wall collapse phenomenon is easy to occur, and the cost of transporting waste rock is high, which increases the cost of retaining wall masonry. Therefore, it is only suitable for plugging work in the case of upward horizontal layering or small mining space. Patent No. ZL201611058728.5 discloses a mine underground strong water-permeable filling retaining wall and a construction method thereof. The waste rock is compacted to form a waste rock layer, and then a layer of water-permeable concrete is laid on the waste rock layer to form a water-permeable concrete layer. After the concrete of the water-permeable concrete layer is solidified, the water-permeable bricks are laid in a staggered manner. Although the water permeability is improved, the overall stability of the wall body is reduced.

[0004] In view of the shortcomings of the above methods, there is an urgent need for a retaining wall construction method with wide application range, simple process, strong bearing capacity, and low cost. SUMMARY

[0005] To solve the above technical problems, the present application provides a simple combined filling retaining wall construction method, which comprises the following steps:

[0006] Step a, two rows of short anchor rod installation holes are constructed in the lower part of the two sides of the filling position of the stop wall in the crossheading, and two rows of short anchor rods are installed, a steel bar is welded on the exposed end of the corresponding short anchor rod on the left and right sides, two discarded threaded steels are tied on the steel bar every 0.4-0.6 m, the two threaded steels are in X shape and perpendicular to the floor of the roadway, then the rock on both sides of the crossheading is blasted and collapsed at the non-filling stop wall construction position, the collapsed rock is loaded to the filling stop wall construction position by a shovel truck, the outside of the waste rock pile is at an angle of 35-45° with the floor of the crossheading, a row of vertical long anchor rods are arranged in the waste rock pile during the stacking process, and geotextile is laid on the inside of the waste rock pile, and then the first filling of the goaf is carried out, the filling height is flush with the height of the waste rock pile;

[0007] Step b, several layers of sandbags are laid on the inside of the anchor rod on the waste rock pile, the sandbags are filled with filling slurry every time a layer of sandbags is laid, and then a new layer of sandbags is laid, and the process is repeated until the sandbag wall is completed, and then geotextile is laid on the inside of the sandbag, and then the second filling of the goaf is carried out, and the filling height is the height of the sandbag wall;

[0008] Step c, a waste rock masonry wall is built on the upper part of the sandbag wall using waste rock and cement mortar to top the crossheading, a filter pipe is embedded in the wall during the masonry process, and then the third filling of the goaf is carried out and the top is connected.

[0009] Further, the height of the waste rock pile, the height of the sandbag wall and the height of the waste rock masonry wall are all 1 / 3 of the net height of the crossheading.

[0010] Further, the upper part of the waste rock pile has a width of not less than 1 m, and the amount of waste rock required is determined according to the width and height of the crossheading and the accumulation slope angle of the waste rock pile.

[0011] Preferably, in step a, the row distance of the short anchor rod installation hole is 0.3-0.5 m, the hole distance is 0.2-0.4 m, the short anchor rod is a threaded steel anchor rod, the length is 0.4-0.6 m, and the exposed length of the short anchor rod is 0.2-0.3 m.

[0012] Preferably, in step a, the length of the steel bar is 1.05-1.1 times the width of the crossheading, the length of the discarded threaded steel is 0.2-0.4 m, the angle between the two discarded threaded steels is 45-60°, and the welding length between the short anchor rod and the steel bar is not less than 10 cm.

[0013] Preferably, in the step a, the long anchor rod is a threaded steel anchor rod or a pipe joint anchor rod, the distance between the long anchor rods is 0.2-0.5m, and the long anchor rods are arranged at the outer boundary of the sandbag wall, and the exposed length is equal to 1 / 3 of the height of the connecting lane.

[0014] Further, in the step b, in order to accelerate the sandbag laying speed, the filling slurry filled into the sandbag needs to be added with a quick-setting agent.

[0015] Preferably, the water filter pipe is a pvc or pve pipe, the pipe diameter is 50-100mm, the outer side of the water filter pipe is wrapped with a hemp bag, and the wrapping thickness is 3-5mm.

[0016] Beneficial effects

[0017] Compared with the prior art and method, the simple combined filling retaining wall construction method provided by the application has the following beneficial effects:

[0018] (1) The filling retaining wall construction process is simple, the filling retaining wall construction period is short, and the cost is low. The main cost is to construct the filling retaining wall by using the caved waste rock and the filling slurry, and the entire filling retaining wall construction can be completed by using a scraper and a small amount of labor. The entire construction process is simple, the progress is fast, the main construction materials are obtained nearby, the material transportation cost is saved, it is fast and convenient, and the cost is low.

[0019] (2) The filling retaining wall has strong bearing capacity. In the filling retaining wall construction process, the overall bearing capacity of the filling retaining wall is improved by constructing the outer slope and pre-burying anchor rods and steel bars.

[0020] (3) The filling retaining wall is formed in several times, which is beneficial to observe the filling condition of the stope and improves the stope filling quality. The filling retaining wall is formed in three times from bottom to top, and is accompanied by the stope filling. In the first two filling processes of the stope, the site technical personnel can directly observe the stope filling condition, and if there is water accumulation on the surface of the filling body and other conditions affecting the filling body quality after the first two filling processes, the filling body quality can be directly treated, and the stope filling quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be further described in detail below with reference to the drawings.

[0022] Figure 1 is a side view of the simple combined filling retaining wall construction method provided by the application;

[0023] Figure 2 is a front view of the simple combined filling retaining wall construction method provided by the application;

[0024] In the figure: 1 - waste rock pile; 2 - short anchor rod; 3 - steel bar; 4 - discarded threaded steel; 5 - long anchor rod; 6 - sandbag wall; 7 - waste rock masonry wall; 8 - water filter pipe; 9 - geotextile; 10 - first filling body; 11 - second filling body; 12 - third filling body. DETAILED DESCRIPTION

[0025] The technical solutions of the embodiments of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of the present application.

[0026] The ore of the lead-zinc ore body is mainly gravel rock and sandstone type, and the mineralization is relatively uniform. The Zn grade varies in the range of 0.02-20.16%, generally 7.8-10.5%, and the average grade is 8.32%; the Pb grade varies in the range of 0-5.32%, generally 3.2-4.45%, and the average grade is 4.28%. The mine is recovered by filling method, and before the stope filling, a simple combined filling retaining wall construction method provided by the present application is used to construct the filling retaining wall of the stope, which comprises the following steps:

[0027] Step a, two rows of short anchor rod installation holes arranged in staggered manner are constructed at the lower part of the two sides of the filling retaining wall construction position in the stope connecting lane, and two rows of short anchor rods 2 are installed, the row distance of the short anchor rod 2 installation holes is 0.4 m, the hole distance is 0.4 m, the material of the short anchor rod 2 is threaded steel anchor rod, the length is 0.5 m, the exposed length of the short anchor rod 2 is 0.2 m, then a steel bar 3 is welded on the exposed end of the corresponding short anchor rod 2 on the left and right sides respectively, two discarded threaded steels 4 are tied on the steel bar 3 every 0.5 m, the two threaded steels are in X shape and perpendicular to the floor of the lane, the length of the steel bar 3 is 1.1 times the width of the connecting lane, the length of the discarded threaded steel 4 is 0.4 m, the angle between the two discarded threaded steels 4 is 45°, and the welding length between the short anchor rod 2 and the steel bar 3 is 15 cm. Then shallow holes are constructed in the connecting lane at the non-filling retaining wall construction position, the hole depth is 2.0 m, the hole diameter is 40 mm, and the rock on the two sides is collapsed by filling and blasting with rolled emulsion explosive, 2.0 m 3The shovel loader loads the collapsed rock to the filling retaining wall construction position to stack, the outside of the stacked waste rock pile 1 is at 35-45° angle with the floor of the connecting lane, the upper width of the waste rock pile 1 is 1.2m, the waste rock quantity required is determined according to the width, height of the connecting lane and the waste rock pile 1 accumulation slope angle when the waste rock pile 1 is stacked, a row of vertical long anchor rods 5 is arranged in the waste rock pile 1 during the stacking process, the long anchor rod 5 is a threaded steel anchor rod or a pipe joint type anchor rod, the spacing between the long anchor rods 5 is 0.5m, the long anchor rod 5 is arranged at the outside boundary of the sandbag wall, and the exposed length is equal to 1 / 3 of the height of the connecting lane. Then the geotextile 9 is laid on the inside of the waste rock pile 1, and then the first filling of the goaf is carried out, and the filling height is flush with the height of the waste rock pile 1.

[0028] Step b, several layers of sandbags are laid on the inside of the long anchor rod on the waste rock pile 1, the sandbags are filled with filling slurry after each layer of sandbags is laid, and then a new layer of sandbags is laid, and the cycle is repeated until the sandbags are laid, forming a sandbag wall 6, the height of the sandbag wall 6 is 1 / 3 of the net height of the connecting lane. In order to speed up the sandbag laying speed, the filling slurry filled into the sandbags needs to add a quick-setting agent, and the dosage of the quick-setting agent is 0.01%-0.05% of the cement dosage. Then the geotextile 9 is laid on the inside of the sandbag, and after the geotextile 9 is laid, the second filling of the goaf is carried out, and the filling height is the height of the sandbag wall 6.

[0029] Step c, a waste rock masonry wall 7 is built on the upper part of the sandbag wall 6 using waste rock and cement mortar, and the waste rock masonry wall 7 is in contact with the top of the connecting lane, the height of the waste rock masonry wall 7 is 1 / 3 of the net height of the connecting lane, and the filter pipe 8 is embedded in the wall during the masonry process, the filter pipe 8 is made of pvc pipe with a diameter of 80mm, the outside of the filter pipe 8 is wrapped with a cloth bag with a wrapping thickness of 5mm, and the third filling of the goaf is carried out after the waste rock masonry wall 7 is formed and the top is contacted.

[0030] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of constructing a simple composite fill retaining wall, characterized by The method comprises the following steps: Step a, two rows of short anchor rod installation holes are constructed in the lower part of the two sides of the filling position of the support wall in the crossheading, and two rows of short anchor rods are installed, a steel bar is welded on the exposed end of the corresponding short anchor rod on the left and right sides, two discarded threaded steels are tied on the steel bar every 0.4-0.6 m, the two threaded steels are in X shape and perpendicular to the floor of the crossheading, then the rock on the two sides of the crossheading is blasted and collapsed at the non-filling position of the support wall, the collapsed rock is loaded to the filling position of the support wall by a shovel truck, the outside of the rock pile is at an angle of 35-45° with the floor of the crossheading, a row of vertical long anchor rods are arranged in the rock pile during the stacking process, and geotextile is laid on the inside of the rock pile, then the first filling of the goaf is carried out, and the filling height is flush with the height of the rock pile; Step b, sandbags are laid on the inside of the long anchor rods on the rock pile, the sandbags are filled with filling slurry every time a layer of sandbags is laid, then the next layer of sandbags is laid, and the process is repeated until the sandbag wall is completed, then geotextile is laid on the inside of the sandbag wall, and the second filling of the goaf is carried out after the geotextile is laid, and the filling height is the height of the sandbag wall; Step c, a rock masonry wall is built on the upper part of the sandbag wall by using rock and cement mortar, and the rock masonry wall is connected to the top of the crossheading, a water filter pipe is embedded in the wall during the building process, and the third filling of the goaf is carried out after the rock masonry wall is formed.

2. A method of constructing a retaining wall by simple combination filling according to claim 1, characterized in that: The height of the rock pile, the height of the sandbag wall and the height of the rock masonry wall are all 1 / 3 of the net height of the crossheading.

3. The method of claim 1, wherein: The upper width of the rock pile should not be less than 1 m, and the amount of rock required is determined according to the width and height of the crossheading and the slope angle of the rock pile.

4. The method of claim 1, wherein: In step a, the row distance of the short anchor rod installation hole is 0.3-0.5 m, and the hole distance is 0.2-0.4 m, the short anchor rod is a threaded steel anchor rod, the length is 0.4-0.6 m, and the exposed length of the short anchor rod is 0.2-0.3 m.

5. The method of claim 1, wherein: In step a, the length of the steel bar is 1.05-1.1 times the width of the crossheading, the length of the discarded threaded steel is 0.2-0.4 m, the angle between the two discarded threaded steels is 45-60°, and the welding length between the short anchor rod and the steel bar is not less than 10 cm.

6. The method of claim 1, wherein: In step a, the long anchor rod is a threaded steel anchor rod or a pipe slot anchor rod, the distance between the long anchor rods is 0.2-0.5 m, and the long anchor rods are arranged at the outer boundary of the sandbag wall, and the exposed length is equal to 1 / 3 of the height of the crossheading.

7. The method of claim 1, wherein: In step b, in order to speed up the laying speed of the sandbags, the filling slurry filled into the sandbags needs to add a quick-setting agent.

8. The method of claim 1, wherein: The water filter pipe is a pvc or pve pipe with a diameter of 50-100 mm, and the outside of the water filter pipe is wrapped with a hemp bag with a thickness of 3-5 mm.

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