CN110700855A - Method for preventing horizontal dislocation at high roof contact rate of gob-side entry retaining roadside support - Google Patents

Method for preventing horizontal dislocation at high roof contact rate of gob-side entry retaining roadside support Download PDF

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Publication number
CN110700855A
CN110700855A CN201910852475.6A CN201910852475A CN110700855A CN 110700855 A CN110700855 A CN 110700855A CN 201910852475 A CN201910852475 A CN 201910852475A CN 110700855 A CN110700855 A CN 110700855A
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CN
China
Prior art keywords
grouting
gob
mould
entry retaining
support
Prior art date
Application number
CN201910852475.6A
Other languages
Chinese (zh)
Inventor
王仲伦
朱德福
霍昱名
宋选民
孙泽东
刘国方
曹健洁
蔚瑞
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太原理工大学
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Application filed by 太原理工大学 filed Critical 太原理工大学
Priority to CN201910852475.6A priority Critical patent/CN110700855A/en
Publication of CN110700855A publication Critical patent/CN110700855A/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • E21D11/105Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete

Abstract

The invention discloses a method for preventing horizontal dislocation of a high-roof-contact-ratio gob-side entry retaining support, which improves the stability of the gob-side entry retaining support by using a grouted concrete mold with upper and lower clamping columns, so that the gob-side entry retaining support has the capability of resisting horizontal stress; an upper grouting section is formed, and a supporting point is formed on a top plate of the roadway, so that the top plate is easy to collapse in time, and a pressure relief effect is formed; a lower grouting section is formed, and an isolation strip is formed on a roadway bottom plate, so that roadway bottom bulging is prevented to a certain extent; through the engineering plastic mould, the mould quality is reduced, and the modularization operation is easy to realize.

Description

Method for preventing horizontal dislocation at high roof contact rate of gob-side entry retaining roadside support

Technical Field

The invention relates to a waterproof translation moving method of a roadside support body during gob-side entry retaining, in particular to a gob-side entry retaining technology of an inclined coal seam, and belongs to the field of mining engineering.

Background

In order to effectively save coal resources, the gob-side entry retaining technology is widely applied, and the existing mainstream gob-side entry retaining technology is a flexible membrane concrete technology. But the waste rocks which fall in the adjacent working face goafs are accumulated on the side edge of the flexible mold concrete wall body, and certain lateral pressure is provided for the flexible mold concrete wall body; especially, when the working face is obliquely propelled, the roadside support body is subjected to a certain level of horizontal ground stress, so that the stability of the roadside support body is poor. Because the gob-side entry retaining mode is difficult to ensure better roof contact rate, the roadway support effect is poor. Simultaneously, must carry out the operation of cutting one's head when tunnel roof intensity is great to guarantee the stability of tunnel country rock and support body. The gob-side entry retaining technical process is complicated, and the stability of the roadside support body is poor, so that a new gob-side entry retaining method needs to be provided to solve the problems.

Based on the defects of the gob-side entry retaining technology, the device and the method for preventing horizontal dislocation of the gob-side entry retaining roadside support body with high roof contact rate are provided. The stability of the gob-side entry retaining roadside support body is improved by using a grouted concrete mold with upper and lower clamping columns, so that the gob-side entry retaining roadside support body has the capability of resisting horizontal stress; an upper grouting section is formed, and a supporting point is formed on a top plate of the roadway, so that the top plate is easy to collapse in time, and a pressure relief effect is formed; a lower grouting section is formed, and an isolation strip is formed on a roadway bottom plate, so that roadway bottom bulging is prevented to a certain extent; through the engineering plastic mould, the mould quality is reduced, and the modularization operation is easy to realize.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the device and the method for the gob-side entry retaining roadside supporter have the advantages of reasonable design, high roof contact rate, prevention of horizontal dislocation of the roadside supporter, roof cutting effect and prevention of certain anti-bottom heave effect.

The invention relates to a method for preventing horizontal dislocation at high roof contact rate of a gob-side entry retaining roadside support, which comprises the following steps:

actually measuring the inclination angle of the coal seam and the lithology of the rock stratum of the top floor of the roadway on site;

calculating the width of the gob-side entry retaining roadside support body, and determining the height and the width of an upper clamping column and a lower clamping column of the support body according to the lithology of a top plate and a bottom plate of the roadway;

manufacturing an engineering plastic mould, setting the inclination angle of the upper edge and the lower edge, the width of the mould, the height of the mould and the height of the upper clamping column and the lower clamping column according to the calculation result, and setting the positions of an upper grouting inlet and a lower grouting inlet on the engineering plastic mould;

digging a clamping column groove suitable for the clamping column height of an engineering plastic mould at a tunnel top plate at a preset position of a gob-side entry retaining roadside support body, and simultaneously drilling a grouting groove with the diameter of 50mm and the height of 0.5 m;

transporting the engineering plastic mold to a gob-side entry retaining working point, and installing the engineering plastic mold into a corresponding top-bottom plate column groove, wherein an upper grouting inlet and a lower grouting inlet of the engineering plastic mold are placed into grouting grooves;

after the concrete is fully stirred, the stirred concrete grout is conveyed by using a concrete conveying pump, and a concrete grouting pump is adopted to inject the concrete grout into an upper grouting groove and a lower grouting groove from an upper grouting inlet and a lower grouting inlet exposed out of a mould, wherein the grouting pressure is 2.0MPa, and the grouting time is 15 min; after concrete flows out of a liquid outlet of the mould, sealing the liquid outlet by using a paper strip, and stopping pouring the concrete;

and after the mold is stabilized, repeating the steps until all supporting along the empty roadway is completed.

Furthermore, the coal seam inclination angle measured in the actual measurement stage is the inclination angle of the direction of the stope face, and sectional statistics is carried out on the angle change section.

Further, in the theoretical calculation stage, when the surrounding rock of the roadway is mud rock with weak strength, the width of the upper and lower clamping columns of the supporting body is set to be three-fourths of the width of the supporting body, and the height is set to be 1.5 m; when the roadway surrounding rock is sandstone or limestone with high strength, the width of the upper and lower support columns of the support body is set to be one fourth of the width of the support body, and the height is set to be 1 m.

Further, in the stage of manufacturing the mold, the adopted engineering plastic raw material is polyphenyl thioether; the thickness of the mould is 5cm, and the top of the mould is provided with a grouting inlet and a grouting outlet with the diameter of 10 cm; a grouting pipeline with the inner diameter of 3cm for grouting concrete to flow is arranged in the mold, and a grouting liquid inlet hole and a grouting liquid outlet pipe for grouting with the inner diameter of 3cm are arranged on the surface of the mold; the die length is 2 m.

Further, in the roadway retaining column clamping groove and grouting groove cutting stage, the top-bottom plate clamping column groove is matched with an upper clamping column and a lower clamping column of the mold, the center line of the grouting groove is coincided with the clamping column groove, the width is 0.2m, and the height is 0.5 m.

Compared with the related art, the invention has the advantages and beneficial effects that: the design can ensure that the supporting body is provided with the upper clamping column and the lower clamping column and the grouting column can ensure that the supporting body can be completely connected with the top and the bottom, and ensure that the supporting body can completely support the roadway in time; when the inclination angle of the coal seam is larger or the horizontal stress is larger, the support body has larger stability, the roadside support body is effectively prevented from horizontal dislocation, and the support body is not easy to topple; the upper clamping column and the upper grouting column of the supporting body form an open-cut effect and a fulcrum effect, so that a separation block body of an overlying rock layer can be quickly rotated and sunk to form a roof-cutting pressure-relief effect; the lower clamping column and the lower grouting column of the support body effectively isolate the bottom plate rock stratum to form a strong bearing structure, and play a certain role in preventing bottom bulging; the supporting body mold is an engineering plastic body with the length of 2m and the wall thickness of 5cm, and is small in weight, high in strength, easy to load, process, transport and realize modular operation.

Drawings

Fig. 1 is a schematic flow chart of a method for preventing horizontal dislocation at a high roof contact rate of a gob-side entry retaining roadside support provided by the invention;

fig. 2 is a schematic view of the device configuration of the method for preventing horizontal dislocation at high roof contact rate of the gob-side entry retaining roadside support provided by the invention;

FIG. 3 is a three-view diagram of an engineering plastic mold of the method for preventing horizontal dislocation with high roof contact rate of the gob-side entry retaining roadside support provided by the invention;

reference numerals:

the method comprises the following steps of 1-gob-side entry retaining roadway, 2-support body, 3-engineering plastic mold, 4-upper grouting outlet, 5-upper grouting pipe, 6-lower grouting outlet, 7-mold upper clamping column, 8-roadway top plate, 9-roadway bottom plate, 10-lower grouting pipe, 11-in-mold concrete, 12-lower grouting groove grouting section, 13-upper grouting groove grouting section, 14-mold liquid outlet, 15-mold liquid inlet, 16-upper grouting inlet, 17-lower grouting inlet and 18-mold lower clamping column.

Detailed Description

The present invention is described in further detail below with reference to the attached drawings.

Based on the defects of the gob-side entry retaining technology in the prior art, the invention provides a method for preventing horizontal dislocation with high roof contact rate of a gob-side entry retaining roadside support. The stability of the gob-side entry retaining roadside support body is improved by using a grouted concrete mold with upper and lower clamping columns, so that the gob-side entry retaining roadside support body has the capability of resisting horizontal stress; an upper grouting section is formed, and a supporting point is formed on a top plate of the roadway, so that the top plate is easy to collapse in time, and a pressure relief effect is formed; a lower grouting section is formed, and an isolation strip is formed on a roadway bottom plate, so that roadway bottom bulging is prevented to a certain extent; through the engineering plastic mould, the mould quality is reduced, and the modularization operation is easy to realize.

As shown in fig. 1, the invention provides a method for preventing horizontal dislocation at high roof contact rate of a gob-side entry retaining roadside support, which comprises the following specific steps:

actually measuring the inclination angle of the coal seam and the lithology of the rock stratum of the top floor of the roadway on site;

calculating the width of the gob-side entry retaining roadside support body, and determining the height and the width of an upper clamping column and a lower clamping column of the support body according to the lithology of a top plate and a bottom plate of the roadway;

manufacturing an engineering plastic mould, setting the inclination angle of the upper edge and the lower edge, the width of the mould, the height of the mould and the height of the upper clamping column and the lower clamping column according to the calculation result, and setting the positions of an upper grouting inlet and a lower grouting inlet on the engineering plastic mould;

digging a clamping column groove suitable for the clamping column height of an engineering plastic mould at a tunnel top plate at a preset position of a gob-side entry retaining roadside support body, and simultaneously drilling a grouting groove with the diameter of 50mm and the height of 0.5 m;

transporting the engineering plastic mold to a gob-side entry retaining working point, and installing the engineering plastic mold into a corresponding top-bottom plate column groove, wherein an upper grouting inlet and a lower grouting inlet of the engineering plastic mold are placed into grouting grooves;

after the concrete is fully stirred, the stirred concrete grout is conveyed by using a concrete conveying pump, and a concrete grouting pump is adopted to inject the concrete grout into an upper grouting groove and a lower grouting groove from an upper grouting inlet and a lower grouting inlet exposed out of a mould, wherein the grouting pressure is 2.0MPa, and the grouting time is 15 min; after concrete flows out of a liquid outlet of the mould, sealing the liquid outlet by using a paper strip, and stopping pouring the concrete;

and after the mold is stabilized, repeating the steps until all supporting along the empty roadway is completed.

Actually measuring the coal seam inclination angle and the lithology of the roadway top and bottom plate rock stratum on site; theoretical calculation is carried out, the width of the gob-side entry retaining roadside support body 2 is calculated, and the height and the width of an upper 7-column and a lower 18-column of the support body are determined according to the lithology of a top floor of a roadway; manufacturing a mould, namely manufacturing an engineering plastic mould according to the calculation result of the previous step, wherein the upper edge and the lower edge of the engineering plastic mould are inclined, the width of the mould, the height of the mould and the heights of the upper clamping column 7 and the lower clamping column 18; and (3) performing tunnel retaining and column clamping and grouting groove cutting: digging a clamping column groove suitable for the clamping column height of an engineering plastic mould at a tunnel top plate at a preset position of a gob-side entry retaining roadside support body, and simultaneously drilling a grouting groove with the diameter of 50mm and the height of 0.5 m; mounting an engineering plastic mould, namely transporting the engineering plastic mould to a gob-side entry retaining working point, and mounting the mould into a corresponding top-bottom plate clamp column groove, wherein an upper grouting inlet 16 and a lower grouting inlet 17 of the mould are required to be placed into grouting grooves; concrete is poured into the support body, after the concrete is fully stirred, the stirred concrete slurry is conveyed by a concrete conveying pump to be poured into the mould through a mould liquid inlet 14, and after the concrete flows out of a mould liquid outlet 15, the concrete is sealed by paper strips, and then the concrete is stopped to be poured; grouting concrete, namely, injecting concrete grouting pumps into the upper and lower grouting grooves from an upper grouting inlet 16 and a lower grouting inlet 17 exposed out of the mold, wherein the grouting pressure is 2.0MPa, and the grouting time is 15 min; and after the mold is stabilized, repeating the steps until all supporting along the empty roadway is completed.

Furthermore, the coal seam inclination angle measured in the actual measurement stage is the inclination angle of the direction of the stope face, and sectional statistics is carried out on the angle change section.

Further, in the theoretical calculation stage, when the surrounding rock of the roadway is mud rock with weak strength, the width of the upper and lower clamping columns of the supporting body is set to be three-fourths of the width of the supporting body, and the height is set to be 1.5 m; when the roadway surrounding rock is sandstone or limestone with high strength, the width of the upper and lower support columns of the support body is set to be one fourth of the width of the support body, and the height is set to be 1 m.

Further, in the stage of manufacturing the mold, the adopted engineering plastic raw material is polyphenyl thioether; the thickness of the mould is 5cm, and the top of the mould is provided with a grouting inlet and a grouting outlet with the diameter of 10 cm; a grouting pipeline with the inner diameter of 3cm for grouting concrete to flow is arranged in the mold, and a grouting liquid inlet hole and a grouting liquid outlet pipe for grouting with the inner diameter of 3cm are arranged on the surface of the mold; the die length is 2 m. As shown in fig. 3.

Further, in the roadway retaining column clamping groove and grouting groove cutting stage, the top-bottom plate clamping column groove is matched with an upper clamping column and a lower clamping column of the mold, the center line of the grouting groove is coincided with the clamping column groove, the width is 0.2m, and the height is 0.5 m. As shown in fig. 2.

Compared with the related art, the invention has the advantages and beneficial effects that: the design can ensure that the supporting body is provided with the upper clamping column and the lower clamping column and the grouting column can ensure that the supporting body can be completely connected with the top and the bottom, and ensure that the supporting body can completely support the roadway in time; when the inclination angle of the coal seam is larger or the horizontal stress is larger, the support body has larger stability, the roadside support body is effectively prevented from horizontal dislocation, and the support body is not easy to topple; the upper clamping column and the upper grouting column of the supporting body form an open-cut effect and a fulcrum effect, so that a separation block body of an overlying rock layer can be quickly rotated and sunk to form a roof-cutting pressure-relief effect; the lower clamping column and the lower grouting column of the support body effectively isolate the bottom plate rock stratum to form a strong bearing structure, and play a certain role in preventing bottom bulging; the supporting body mold is an engineering plastic body with the length of 2m and the wall thickness of 5cm, and is small in weight, high in strength, easy to load, process, transport and realize modular operation.

The scope of the invention is not limited to the description of the method but only by the claims.

Claims (5)

1. A method for preventing horizontal dislocation at high roof contact rate of a gob-side entry retaining roadside support is characterized by comprising the following steps:
actually measuring the inclination angle of the coal seam and the lithology of the rock stratum of the top floor of the roadway on site;
calculating the width of the gob-side entry retaining roadside support body, and determining the height and the width of an upper clamping column and a lower clamping column of the support body according to the lithology of a top plate and a bottom plate of the roadway;
manufacturing an engineering plastic mould, setting the inclination angle of the upper edge and the lower edge, the width of the mould, the height of the mould and the height of the upper clamping column and the lower clamping column according to the calculation result, and setting the positions of an upper grouting inlet and a lower grouting inlet on the engineering plastic mould;
digging a clamping column groove suitable for the clamping column height of an engineering plastic mould at a tunnel top plate at a preset position of a gob-side entry retaining roadside support body, and simultaneously drilling a grouting groove with the diameter of 50mm and the height of 0.5 m;
transporting the engineering plastic mold to a gob-side entry retaining working point, and installing the engineering plastic mold into a corresponding top-bottom plate column groove, wherein an upper grouting inlet and a lower grouting inlet of the engineering plastic mold are placed into grouting grooves;
after the concrete is fully stirred, the stirred concrete grout is conveyed by using a concrete conveying pump, and a concrete grouting pump is adopted to inject the concrete grout into an upper grouting groove and a lower grouting groove from an upper grouting inlet and a lower grouting inlet exposed out of a mould, wherein the grouting pressure is 2.0MPa, and the grouting time is 15 min; after concrete flows out of a liquid outlet of the mould, sealing the liquid outlet by using a paper strip, and stopping pouring the concrete;
and after the mold is stabilized, repeating the steps until all supporting along the empty roadway is completed.
2. The method for preventing horizontal dislocation at high roof contact rate of the gob-side entry retaining roadside support according to claim 1, wherein: and the coal seam inclination angle measured in the actual measurement stage is the inclination angle of the direction of the stope face, and sectional statistics is carried out on the angle change section.
3. The method for preventing horizontal dislocation at high roof contact rate of the gob-side entry retaining roadside support according to claim 1, wherein: in the theoretical calculation stage, when the roadway surrounding rock is mud rock with weak strength, the width of the upper and lower clamping columns of the supporting body is set to be three-fourths of the width of the supporting body, and the height is set to be 1.5 m; when the roadway surrounding rock is sandstone or limestone with high strength, the width of the upper and lower support columns of the support body is set to be one fourth of the width of the support body, and the height is set to be 1 m.
4. The gob-side entry retaining roadside support high-roof-contact-ratio horizontal dislocation prevention and method according to claim 1, wherein: in the mold manufacturing stage, the adopted engineering plastic raw material is polyphenyl thioether; the thickness of the mould is 5cm, and the top of the mould is provided with a grouting inlet and a grouting outlet with the diameter of 10 cm; a grouting pipeline with the inner diameter of 3cm for grouting concrete to flow is arranged in the mold, and a grouting liquid inlet hole and a grouting liquid outlet pipe for grouting with the inner diameter of 3cm are arranged on the surface of the mold; the die length is 2 m.
5. The method for preventing horizontal dislocation at high roof contact rate of the gob-side entry retaining roadside support according to claim 1, wherein: and in the roadway retaining column clamping groove and grouting groove cutting stage, the top-bottom plate clamping column groove is matched with the upper clamping column and the lower clamping column of the mold, the center line of the grouting groove is superposed with the clamping column groove, the width is 0.2m, and the height is 0.5 m.
CN201910852475.6A 2019-09-10 2019-09-10 Method for preventing horizontal dislocation at high roof contact rate of gob-side entry retaining roadside support CN110700855A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2348811C1 (en) * 2007-07-06 2009-03-10 Федеральное государственное унитарное предприятие "Государственный научно-исследовательский, проектный и конструкторский институт горного дела и металлургии цветных металлов" ФГУП "Гипроцветмет" Method of supporting mine tunnels
CN105089693A (en) * 2015-09-09 2015-11-25 中国矿业大学 Goaf-side-roadway-retaining wall roof-contact improving method
CN107091091A (en) * 2017-07-03 2017-08-25 湖南科技大学 A kind of steeply-inclined seam mining gob-side entry retaining method of prefabricated arc support
CN207728376U (en) * 2018-01-05 2018-08-14 山西霍尔辛赫煤业有限责任公司 A kind of gob side entry retaining strengthening of foundation device
CN109707442A (en) * 2019-03-08 2019-05-03 杨世凡 A kind of quick grouting filling bag in the goaf synchronous with coal cutting and its coal-mining method
CN109882237A (en) * 2019-01-23 2019-06-14 西安科技大学 A kind of exploitation of strip filling connects top system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2348811C1 (en) * 2007-07-06 2009-03-10 Федеральное государственное унитарное предприятие "Государственный научно-исследовательский, проектный и конструкторский институт горного дела и металлургии цветных металлов" ФГУП "Гипроцветмет" Method of supporting mine tunnels
CN105089693A (en) * 2015-09-09 2015-11-25 中国矿业大学 Goaf-side-roadway-retaining wall roof-contact improving method
CN107091091A (en) * 2017-07-03 2017-08-25 湖南科技大学 A kind of steeply-inclined seam mining gob-side entry retaining method of prefabricated arc support
CN207728376U (en) * 2018-01-05 2018-08-14 山西霍尔辛赫煤业有限责任公司 A kind of gob side entry retaining strengthening of foundation device
CN109882237A (en) * 2019-01-23 2019-06-14 西安科技大学 A kind of exploitation of strip filling connects top system
CN109707442A (en) * 2019-03-08 2019-05-03 杨世凡 A kind of quick grouting filling bag in the goaf synchronous with coal cutting and its coal-mining method

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