CN210033527U

CN210033527U - Filling retaining wall

Info

Publication number: CN210033527U
Application number: CN201920856228.9U
Authority: CN
Inventors: 赵恰; 王旭; 杨柱; 王军; 黄炳仁; 王亮
Original assignee: Changsha Institute of Mining Research Co Ltd
Current assignee: Changsha Institute of Mining Research Co Ltd
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-02-07
Anticipated expiration: 2029-06-06

Abstract

The utility model relates to an underground mining technical field especially relates to a fill barricade. This fill barricade includes: the two baffles are arranged in the roadway between the goaf and the rock veins, the circumferential edges of the two baffles are respectively attached to surrounding rocks of the roadway, and a filling space is formed by the two baffles and the surrounding rocks; the expansion type filler is formed by expanding and condensing expansion liquid filled in the filling space, and can fill the filling space and bond the surrounding rock and the two baffles. The filling retaining wall is formed by bonding the expansion type filler and the baffle, the filling retaining wall is condensed with the surrounding rock, and the expansion liquid has fluidity and can be diffused to each corner in the filling space in the expansion process, so that the connection strength of the connection part of the filling retaining wall and the surrounding rock can be greatly improved, the slurry leakage phenomenon in the process of filling the goaf can be effectively prevented, and the filling accidents such as collapse can be effectively avoided.

Description

Filling retaining wall

Technical Field

The utility model relates to an underground mining technical field especially relates to a fill barricade.

Background

In related technologies, in mines adopting various mining methods such as an access type cemented filling mining method, a sublevel mining method and a sublevel mining method, and a later filling method, before filling operation starts, a filling retaining wall needs to be constructed to seal an access entrance or a dead zone entrance of a stope, so that slurry does not leak to an access to be filled or other areas where stope accidents happen in the filling process. Compared with an open stope method and a caving method, the filling method has the advantages of wide adaptation conditions, low mining loss and dilution rate, contribution to maintaining the ground pressure and stabilizing the stope, easiness in realizing green mining of the mine and the like, and increasingly wide application, and almost all precious metal mines such as nonferrous metals, gold and the like adopt the filling method, even part of the mines begin to adopt the filling method.

The filling mining method can effectively reduce the discharge amount of mine tailings, reduce the dilution loss rate of the mine, improve the ore recovery amount and promote the construction of green mines, and becomes a main mining method for underground mining in China.

The filling retaining wall is a main technical link of a filling mining method, directly influences the filling efficiency of mine production, even influences the success or failure of the filling technology, and therefore becomes the primary key filling technical problem of the mine. The retaining walls adopted in the existing mines are mainly light retaining walls and gravity retaining walls. The light retaining wall mainly uses a template retaining wall, and the gravity retaining wall is a brick retaining wall, a waste stone retaining wall and a concrete retaining wall.

Among these, lightweight retaining walls have some problems in application: lightweight retaining walls are less strong, resist side pressure limitations, affect single fill height, result in low fill efficiency, and are prone to collapse events during filling.

Gravity retaining walls also present some problems in application: brick barricade and barren rock barricade because the reason of the self structure of material, the concrete barricade can not fully vibrate in pouring owing to receive construction condition's restriction, all can appear the barricade and the problem that the tunnel country rock can not bond together, easily produces the displacement at filling in-process, and then when filling the collecting space area, appears the phenomenon of running thick liquid in a large number easily, can cause the collapse even when serious, causes the filling accident.

Therefore, it is highly desirable to provide a filling retaining wall to improve the degree of condensation between the retaining wall and the surrounding rock, so as to improve the connection strength between the retaining wall and the surrounding rock, and further effectively avoid slurry leakage during the filling process of the goaf.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fill barricade to improve the degree of condensing of barricade and country rock, thereby improve the joint strength between barricade and the country rock, and then effectively avoid appearing running thick liquid phenomenon in the filling process in collecting space area.

In order to achieve the above object, the present invention provides the following technical solutions;

based on above-mentioned first purpose, the utility model provides a fill barricade, include:

the two baffles are arranged in the roadway between the goaf and the dikes, the circumferential edges of the two baffles are respectively attached to surrounding rocks of the roadway, and a filling space is formed by the two baffles and the surrounding rocks;

the expansion type filler is formed by expanding and condensing expansion liquid filled in the filling space, and can fill the filling space and bond the surrounding rock and the two baffles.

In any of the above technical solutions, optionally, the filling retaining wall further includes:

and one end of the anchor rod is fixedly arranged in the surrounding rock, and the other end of the anchor rod extends into the expansion type filler.

In any of the above technical solutions, optionally, the expansion coefficient value of the expansion liquid is 1 to 5, and the setting time is in a range of 5min to 30 min.

In any of the above solutions, optionally, the expansion fluid is a mixture of cement slurry and polyurethane slurry, the cement slurry is a mixture of water and cement, and the polyurethane slurry is a water-soluble polyurethane solution.

In any of the above embodiments, optionally, the polyester ammonia slurry is the water-soluble polyester ammonia solution having a coefficient of expansion value of 2 to 4 and a gel time of not more than 40 s.

In any of the above solutions, optionally, the pressure of the expansion fluid in the filling space is in a range of 0.05-0.1 MPa.

In any one of the above technical solutions, optionally, a liquid through hole is provided on one of the two baffles close to the dike, and the expansion liquid is filled into the filling space through the liquid through hole.

the two baffle plates are arranged on the surrounding rock, and the parts of the two baffle plates are correspondingly abutted to one side of the two baffle plates, which is far away from the filling space, so that the two baffle plates are stopped and move towards the direction far away from each other.

In any one of the above technical solutions, optionally, the stopping assembly includes a plurality of fixing columns distributed along the circumferential direction of the roadway, the fixing columns are fixedly connected with the surrounding rock, and at least a part of the fixing columns abuts against a surface of the baffle plate facing away from the filling space.

In any of the above technical solutions, optionally, the shape of the baffle is the same as the cross-sectional shape of the roadway;

the distance between the two baffles is 1-3 m.

Adopt above-mentioned technical scheme, the beneficial effects of the utility model are that:

the utility model provides a fill the barricade, make the expanded type filler form the barricade that fills of high strength with the baffle, and should fill the barricade and condense together with the country rock, because inflation liquid has mobility, inflation liquid can spread to every corner in filling the space in the inflation, can improve the joint strength who fills the connection position of barricade and country rock by a wide margin, thereby can effectively prevent to appear running thick liquid phenomenon at the in-process of filling the collecting space area, the security and the packing efficiency of filling collecting space area construction have been improved, can effectively avoid taking place to collapse etc. and fill the accident.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a flow chart of a method for constructing a filling retaining wall according to an embodiment of the present invention;

fig. 2 is a schematic view of a state in which a plurality of filling retaining walls are constructed simultaneously in the method for constructing a filling retaining wall according to the embodiment of the present invention;

fig. 3 is a schematic view of a connection structure between a hole pipe and a liquid through hole in a method for constructing a filling retaining wall according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating an installation state of a filling retaining wall according to an embodiment of the present invention;

FIG. 5 is a schematic view of the filled retaining wall of FIG. 4 at section A-A;

FIG. 6 is a schematic view of the filled retaining wall of FIG. 4 at section B-B;

fig. 7 is a schematic view of a connection structure between a retaining plate and a stopping component of a filling retaining wall according to an embodiment of the present invention.

Icon: 10-a goaf; 11-dike; 12-a roadway; 13-pillar of ore; 14-surrounding rock; 2-filling a retaining wall; 20-anchor rod; 21-a baffle plate; 210-liquid through hole; 22-an intumescent filler; 230-fixed column; 231-a connector; 30-a mixing device; 31-a conveying device; 32-cement slurry storage means; 33-a polyester ammonia slurry storage device; 34-orifice tube; 35-a first main line; 36-second main line.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Referring to fig. 1 to 7, the present embodiment provides a filling retaining wall; FIG. 1 is a flow chart of a method for constructing a filled retaining wall according to this embodiment; fig. 2 is a schematic view of a state in which a plurality of filled retaining walls are constructed simultaneously in the method for constructing a filled retaining wall according to the present embodiment; fig. 3 is a schematic view of a connection structure between a port pipe and a liquid through hole in the construction method of the filling retaining wall according to the embodiment; fig. 4 is a schematic view of the installation state of the retaining wall according to this embodiment, which clearly shows the relative position relationship between the retaining wall and the goaf, the dike, the roadway and the surrounding rock; FIG. 5 is a schematic view of the filled retaining wall of FIG. 4 at section A-A; FIG. 6 is a schematic view of the filled retaining wall of FIG. 4 at section B-B; fig. 7 is a schematic view of the connection structure between the retaining plate and the stop assembly of the filling retaining wall according to this embodiment.

The filling retaining wall provided by the embodiment is constructed in a roadway between the goaf and the dikes, so that the goaf is isolated from the dikes, the goaf is conveniently grouted to fill the goaf, and the filling mining method can be safely and smoothly constructed.

As shown in fig. 1 to 3 in combination with fig. 4 to 7, the filling retaining wall provided in this embodiment includes: the two baffles are arranged in the roadway between the goaf and the rock veins, the circumferential edges of the two baffles are respectively attached to surrounding rocks of the roadway, and a filling space is formed by the two baffles and the surrounding rocks; the expansion type filler is formed by expanding and condensing expansion liquid filled in the filling space, and can fill the filling space and bond the surrounding rock and the two baffles.

As shown in fig. 1, the filling retaining wall comprises a structure constructed by the steps of:

101, arranging two baffles 21 in a roadway 12 between a gob 10 and a dike 11, and enabling at least partial circumferential edges of the two baffles 21 to be attached to surrounding rocks 14 of the roadway 12 so as to form a filling space by surrounding the two baffles 21 and the surrounding rocks 14;

step 102, filling a preset amount of expansion liquid into the filling space, wherein the expansion liquid can expand and be condensed in the filling space to form an expansion type filler 22;

after a predetermined period of time, step 103, the expansive filler 22 fills the filling space and bonds the surrounding rock 14 and the two retaining plates 21 to form the filled retaining wall 2.

Alternatively, the distance between the two retaining plates 21 is equal everywhere, which is advantageous for improving the uniformity of the strength of filling the retaining wall 2.

In the construction method of the filling retaining wall and the filling retaining wall in the embodiment, the expansion type filler 22 and the baffle 21 are bonded to form the high-strength filling retaining wall 2, and the filling retaining wall 2 and the surrounding rock 14 are condensed together, because the expansion liquid has fluidity, the expansion liquid can be diffused to each corner in the filling space during expansion, so that the connection strength of the connection part of the filling retaining wall 2 and the surrounding rock 14 can be greatly improved, the slurry leakage phenomenon in the process of filling the goaf 10 can be effectively prevented, the construction safety and the filling efficiency of filling the goaf 10 are improved, and the filling accidents such as collapse can be effectively avoided. In addition, the filled retaining wall 2 constructed by the construction method of the filled retaining wall is advantageous in improving the strength and stability of the whole filled retaining wall 2 and the upper limit of the resistance pressure measurement that can be borne compared with a light retaining wall, on the one hand, and the setting strength between the filled retaining wall 2 and the surrounding rock 14 is significantly improved compared with a heavy retaining wall, on the other hand, no retaining wall displacement is generated.

In an alternative of this embodiment, as shown in fig. 3, a liquid through hole is provided on the baffle plate close to the dike, and the expansion liquid is filled into the filling space through the liquid through hole.

A liquid passing hole 210 for filling the inflation liquid into the filling and space is preset on the baffle plate 21, and a pressure measuring device is installed at the liquid passing hole 210 to measure the inflation liquid in the filling space by the pressure measuring device. When the pressure value measured by the pressure measuring device reaches the preset pressure, which indicates that the expansion type filler 22 obtained by expanding and condensing the expansion liquid in the filling space is enough to fill the filling space, the quantity of the expansion liquid is represented by the pressure of the expansion liquid in the filling space, and the method has the advantages of simple structure and accurate measurement, thereby being beneficial to more accurately controlling the structural strength of the formed filling retaining wall 2.

Optionally, a portion of the orifice tube 34 is extended into the filling space to intensively fill the expansion liquid in the filling space, so as to avoid excessive splashing of the expansion liquid, thereby facilitating an increase in the efficiency of the expansion liquid forming the intumescent filler 22. The pressure measuring device is sleeved on the orifice pipe 34 and is installed at the liquid through hole 210.

Alternatively, the orifice tube 34 may be a seamless steel tube to withstand the pressure inside the packed space.

Optionally, only one baffle 21 of the two baffles 21 close to the dike 11 is provided with the liquid through hole 210, and the liquid through hole 210 is positioned at the upper part of the baffle 21, which is beneficial to improving the filling efficiency of the expansion liquid in the filling space.

In an alternative of this embodiment, the shape of the baffle 21 is the same as the cross-sectional shape of the roadway 12, so that it is easy to ensure that the circumferential edges of the baffle 21 conform as closely as possible to the surrounding rock 14. Because the surface of the surrounding rock 14 is mostly uneven, a small amount of gaps exist between the baffle 21 and the surrounding rock 14, but because the expansion liquid has fluidity, the expansion liquid can fill the gaps between the baffle 21 and the surrounding rock 14 and condense the baffle 21 and the surrounding rock 14 at the gaps in the expansion process, so that the bonding strength between the filling retaining wall 2 and the surrounding rock 14 is further improved, the retaining wall and the surrounding rock 14 are integrated, and the lateral pressure of a filling body in the goaf 10 is resisted together. If the shape of the baffle 21 is different from the cross-sectional shape of the roadway 12 in the construction process, the gap between the baffle 21 and the roadway 12 is tightly plugged by woven bags or cotton yarns and the like.

In the alternative of this embodiment, the expansion coefficient value of the expansion liquid is 1-5, and the value range of the predetermined time period is 5min-30 min. By limiting the expansion coefficient of the expansion liquid to be more than or equal to 1, the expansion type filler 22 formed by the reaction, expansion and condensation of the expansion liquid can be ensured to be in full contact with the surrounding rock 14, and the expansion type filler 22 can be ensured to be firmly bonded with the surrounding rock 14; by limiting the expansion coefficient of the expansion liquid to be less than or equal to 5, the situation that the filled retaining wall 2 is insufficient in density and strength due to over expansion of the expansion liquid can be avoided. The setting range of the preset time is limited to 5-30min, so that the expansion liquid can be ensured to react and condense quickly, and the high-efficiency construction of the filling retaining wall 2 can be realized, while the setting time of the traditional concrete retaining wall is 72h, and the construction method of the filling retaining wall reduces the construction time of the retaining wall and is convenient for production organization.

It is to be explained that the expansion coefficient of the expansion fluid is the ratio of the volume of the expansion fluid at the final time of complete expansion and complete coagulation to the volume of the expansion fluid at the initial time of starting expansion.

The expansion coefficient value of the expansion liquid is defined to be 1-5, for example, the expansion coefficient value of the expansion liquid is 2, 2.8, 3, 3.4 or 4, etc., and preferably, the expansion coefficient value of the expansion liquid is 3-4.

In the alternative of the embodiment, the expanding liquid is obtained by mixing cement slurry and polyurethane slurry according to the volume ratio of 1:1-1:3, the cement slurry is obtained by mixing water and cement according to the volume ratio of 1:1-4:3, and the polyurethane slurry is water-soluble polyurethane solution with the expansion coefficient value of 2-4 and the gel time of not more than 40 s.

The expansion liquid obtained by the method has the advantages of strong fluidity, no toxicity and rapid solidification, the setting time can be controlled within 5-30min, the expansion coefficient value can be controlled within 1-5, the compressive strength of the finally obtained expansion type filler 22 is more than 2MPa, and the bonding strength is more than 0.5 MPa. That is, the expansion fluid obtained by mixing the polyurethane slurry and the cement slurry has good expansion effect, and the contact degree and the bonding strength between the expansion type filler 22 and the surrounding rock 14 can be ensured.

Alternatively, the cement is 425 portland cement.

In an alternative of this embodiment, the pressure of the expansion fluid in the filling space is in the range of 0.05-0.1MPa, i.e., the preset pressure in the method for constructing the filled retaining wall is in the range of 0.05-0.1 MPa.

When the expansion coefficient of the expansion liquid is 1-5 and the preset time is 5-30min, limiting the preset pressure to 0.05-0.1MPa can ensure that the quantity of the expansion liquid in the filling space is enough to fill the filling space and the coagulation strength among the expansion filler 22, the surrounding rock 14 and the baffle 21 can be ensured, thereby being beneficial to improving the strength of the filled retaining wall 2.

The distance between the two baffles 21 ranges from 1 to 3 m.

By limiting the distance between the two dams 21 to 1-3m, it is advantageous to increase the resistance of the filling wall 2 to lateral pressure. The filling retaining wall 2 obtained by the construction method of the filling retaining wall has the compression strength of more than 2MPa and the bonding strength with the surrounding rock 14 of more than 0.5MPa, so that the situation that the single filling height in the goaf 10 is too high can be adapted, and the section area of the roadway 12 commonly used at the present stage can be adapted.

In an alternative of this embodiment, as shown in fig. 2 in combination with fig. 4 to 7, two baffles 21 are respectively arranged in a plurality of roadways 12 corresponding to one dike 11, a plurality of mixing devices 30 are arranged in the dike 11, and the plurality of mixing devices 30 correspond to the plurality of roadways 12 one by one;

the cement slurry is sequentially supplied to the plurality of mixing devices 30 along the extending direction of the dike 11 through the first main line 35, the polyurethane slurry is sequentially supplied to the plurality of mixing devices 30 along the extending direction of the dike 11 through the second main line 36, and the cement slurry and the polyurethane slurry are mixed by the mixing devices 30 to form the inflation liquid. Usually, the same dike 11 corresponds a plurality of goafs 10 arranged in order, and adjacent goafs 10 are separated by ore pillars 13, and all communicate through a tunnel 12 between dike 11 and every goaf 10, and through setting up a mixing arrangement 30 in the dike 11 of every 12 mouths in tunnel, can pack the construction of filling retaining wall 2 in a plurality of tunnels 12 that the same dike 11 corresponds simultaneously, and then be favorable to improving retaining wall building efficiency, the production organization of being convenient for.

Alternatively, the cement slurry conveying device 31 and the polyurethane slurry conveying device 31 are both arranged in the dike 11, the inlet of the first main pipeline 35 is communicated with the outlet of the cement slurry conveying device 31, and the inlet of the second main pipeline 36 is communicated with the outlet of the polyurethane slurry conveying device 31, wherein the cement slurry conveying device 31 and the polyurethane slurry conveying device 31 are both single liquid pumps. Or, alternatively, the conveying device 31 is disposed in the dike 11, and the conveying device 31 is a two-fluid pump, that is, the conveying device 31 can convey cement slurry to the first main pipeline 35 and can convey polyurethane slurry to the second main pipeline 36.

Alternatively, as shown in fig. 2, a cement grout storage device 32 and a polyester ammonia grout storage device 33 are provided in the dike 11, thereby facilitating the delivery of the cement grout and the polyester ammonia grout to the first main pipeline 35 and the second main pipeline 36, respectively, through the delivery device 31.

Optionally, the first main pipeline 35 and the second main pipeline 36 both use a steel conveying pipe, and optionally, the steel conveying pipe has a diameter of 42 mm.

Alternatively, the speed at which the transporting device 31 transports the polyurethane slurry and the cement slurry is in the range of 50 to 200L/min and can withstand a pressure of 1MPa or more.

Alternatively, the mixing device 30 comprises two slurry inlet pipes and one slurry outlet pipe which are communicated with each other, wherein the included angle between the two slurry inlet pipes is 40-50 degrees, for example, the included angle between the two slurry inlet pipes is 45 degrees, the two slurry inlet pipes are symmetrically arranged relative to the slurry outlet pipe, the two slurry inlet pipes are respectively communicated with a first main pipeline 35 and a second main pipeline 36, and the slurry outlet pipe is communicated with the orifice pipe 34 communicated with the liquid through hole 210. Optionally, the slurry inlet pipe and the slurry outlet pipe are welded by high-pressure grouting pipes with compressive strength exceeding 2 MPa; optionally, gate valves are disposed between the grouting pipe and the first main pipeline 35, between the grouting pipe and the second main pipeline 36, and between the grout outlet pipe and the liquid through hole 210, so as to facilitate controlling on/off of the flow of at least one of cement grout, polyurethane grout, and expansion liquid.

In an alternative of this embodiment, the filling retaining wall further includes an anchor rod 20, one end of the anchor rod 20 is fixed in the surrounding rock, and the other end of the anchor rod extends into the interior of the expansive filler. That is, during the construction process, one end of the anchor rod 20 is fixed at the position of the surrounding rock 14 corresponding to the position of the retaining wall 2 to be constructed, and when the two baffles 21 and the surrounding rock 14 are enclosed to form a filling space, the other end of the anchor rod 20 is extended into the filling space.

Alternatively, the anchor rod 20 is a slit tube anchor rod 20, the outer diameter of the slit tube anchor rod 20 is 30-40mm, the slit width is 13-18mm, the total length of the slit tube anchor rod 20 is not less than 1500mm, and the length of the slit tube anchor rod 20 extending into the filling space is 400mm-600mm, for example, the length of the slit tube anchor rod 20 extending into the filling space is 500 mm.

Through the arrangement of the anchor rod 20, one end of the anchor rod 20 can be inserted into the surrounding rock 14, and the other end of the anchor rod 20 can be condensed in the expansion type filler 22, so that the adhesive force between the filling retaining wall 2 and the surrounding rock 14 can be improved through the anchor rod 20, the improvement of the filling retaining wall 2 is facilitated, and the slurry leakage phenomenon generated in the filling process of the goaf 10 is avoided.

In an alternative of this embodiment, the filling retaining wall further includes two stopping assemblies disposed on the surrounding rock, and portions of the two stopping assemblies are abutted against one side of the two blocking plates 21 away from the filling space in a one-to-one correspondence manner to stop the two blocking plates 21 from moving in a direction away from each other.

By arranging the stop component, on one hand, in the process of expanding and condensing the expansion liquid, the filling space is favorable for keeping the shape, the situation of retaining wall movement in the forming process of the filling retaining wall 2 is avoided, and the shape of the filling retaining wall 2 and the condensing force between the filling retaining wall and the surrounding rock 14 are favorable for being ensured.

Optionally, the stop assembly abuts a near circumferential edge of the surface of the baffle 21 facing away from the filling space.

Optionally, the stop assembly abuts in a net shape against the surface of the baffle 21 facing away from the filling space.

In an alternative of this embodiment, the stopping assembly comprises a plurality of fixing posts 230 distributed along the circumferential direction of the roadway 12, the fixing posts 230 are fixedly connected with the surrounding rock 14, and at least part of the fixing posts 230 abut against the surface of the baffle 21 facing away from the filling space.

Alternatively, one end of the fixing post 230 extends into and is fixed in the surrounding rock 14, or one end of the fixing post 230 is fixedly connected with the surrounding rock 14 through the anchor rod 20, and the other end of the fixing post 230 abuts against the baffle 21.

Or, alternatively, both ends of the fixing column 230 respectively extend into the opposite positions of the surrounding rock 14, or both ends of the fixing column 230 are respectively fixedly connected with the opposite positions of the surrounding rock 14 through the anchor rods 20, and the middle part of the fixing column 230 abuts against the baffle 21. Wherein, the exposed part of the anchor rod 20 is fixedly connected with the fixing column 230 through a connecting piece 231.

The stopper effect on the baffle 21 is realized through the fixing column 230, the structure is simple, the fixing and installation are easy, and the reliable stopper of the filling body in the goaf 10 can be ensured.

In summary, in an alternative embodiment, the filling retaining wall can be constructed by the following steps:

step 501, one end of an anchor rod 20 is fixedly arranged at a position to be constructed of the surrounding rock 14, corresponding to the filling retaining wall 2;

step 502, arranging two baffles 21 in the roadway 12 between the gob 10 and the dike 11, and enabling at least partial circumferential edges of the two baffles 21 to be attached to the surrounding rock 14 of the roadway 12, so that the two baffles 21 and the surrounding rock 14 are enclosed to form a filling space, and the other end of the anchor rod 20 extends into the filling space;

step 503, arranging two stopping assemblies on the surrounding rock 14, wherein parts of the two stopping assemblies are abutted against one sides of the two baffles 21 departing from the filling space in a one-to-one correspondence manner so as to stop the two baffles 21 from moving in a direction away from each other;

step 504, extending the other end of the anchor rod 20 into the expansion type filler 22;

505, mixing water and cement according to a volume ratio of 1:1-4:3 to form cement slurry, mixing water-based polyurethane with water to obtain polyurethane slurry, enabling the expansion coefficient value of the polyurethane slurry to be 2-4 and the gel time to be not more than 40 seconds, and mixing the cement slurry and the polyurethane slurry according to a volume ratio of 1:1-1:3 to form expansion liquid;

step 506, filling the expansion liquid into the filling space through the liquid through hole 210 until the pressure value measured by the pressure measuring device reaches the preset pressure, wherein the expansion liquid can expand and condense in the filling space to form the expansion type filler 22;

after a predetermined period of time, step 507, the expansive filler 22 fills the filling space and bonds the surrounding rock 14 and the two retaining plates 21 to form the filled retaining wall 2.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Claims

1. A filled retaining wall, comprising:

2. The filled retaining wall of claim 1, further comprising:

3. The filled retaining wall of claim 1,

the expansion coefficient value of the expansion liquid is 1-5, and the value range of the condensation time is 5-30 min.

4. The filled retaining wall of claim 3,

the expanding liquid is a mixture of cement slurry and polyurethane slurry, the cement slurry is a mixture of water and cement, and the polyurethane slurry is a water-soluble polyurethane solution.

5. The filled retaining wall of claim 4,

the polyester ammonia slurry is the water-soluble polyester ammonia solution with the expansion coefficient value of 2-4 and the gel time of not more than 40 s.

6. The filled retaining wall of claim 3,

the pressure intensity range of the expansion liquid in the filling space is 0.05-0.1 MPa.

7. The filled retaining wall of claim 1,

liquid through holes are formed in the two baffle plates, close to the dikes, and the expansion liquid is filled into the filling space through the liquid through holes.

8. The filled retaining wall of claim 1, further comprising:

9. The filled retaining wall of claim 8, wherein the stopping assembly comprises a plurality of fixing posts distributed along the circumferential direction of the roadway, the fixing posts are fixedly connected with the surrounding rock, and at least part of the fixing posts abut against the surface of the baffle plate facing away from the filling space.

10. The filled retaining wall of claim 1,

the shape of the baffle is the same as the shape of the cross section of the roadway;

the distance between the two baffles is 1-3 m.