CN111322093A - Deep soft rock roadway anchoring-U-shaped steel support-after-frame filling cooperative control method - Google Patents

Deep soft rock roadway anchoring-U-shaped steel support-after-frame filling cooperative control method Download PDF

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Publication number
CN111322093A
CN111322093A CN202010244523.6A CN202010244523A CN111322093A CN 111322093 A CN111322093 A CN 111322093A CN 202010244523 A CN202010244523 A CN 202010244523A CN 111322093 A CN111322093 A CN 111322093A
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CN
China
Prior art keywords
roadway
filling
shaped steel
anchoring
support
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Pending
Application number
CN202010244523.6A
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Chinese (zh)
Inventor
姜鹏飞
王志根
杨建威
刘庆波
高富强
汪向明
王海涛
张群涛
李冰冰
郑仰发
王子越
李建忠
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China Coal Xinji Energy Co ltd
Tiandi Science and Technology Co Ltd
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China Coal Xinji Energy Co ltd
Tiandi Science and Technology Co Ltd
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Publication date
Application filed by China Coal Xinji Energy Co ltd, Tiandi Science and Technology Co Ltd filed Critical China Coal Xinji Energy Co ltd
Priority to CN202010244523.6A priority Critical patent/CN111322093A/en
Publication of CN111322093A publication Critical patent/CN111322093A/en
Pending legal-status Critical Current

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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
    • E21D11/14Lining predominantly with metal
    • E21D11/18Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • E21D20/025Grouting with organic components, e.g. resin
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00Methods or devices for placing filling-up materials in underground workings

Abstract

The invention relates to the field of coal mine roadway surrounding rock control, and provides a deep soft rock roadway anchoring-U-shaped steel support-after-frame filling cooperative control method. The method comprises the following steps: s1, carrying out geomechanical test on the surrounding rock of the roadway to obtain geomechanical parameters of the surrounding rock; s2, heading towards the heading direction of the roadway; s3, based on the geomechanical parameters obtained in S1, carrying out anchoring support on a roadway top plate and a side part by adopting a high-strength anchor rod and/or an anchor cable while tunneling, applying prestress matched with the high-strength anchor rod and/or the anchor cable, and forming a prestress bearing structure section in the roadway surrounding rock; s4, lagging a distance in the prestressed bearing structure section to support a U-shaped steel bracket, erecting a plurality of U-shaped steel brackets in a roadway, and sequentially connecting and locking to form a U-shaped steel bracket supporting section; and S5, lagging the supporting section of the section of U-shaped steel bracket for a certain distance, and filling the space between the U-shaped steel bracket and the roadway wall to form a filling section. The invention solves the problems of large deformation and large control difficulty of the surrounding rock of the deep soft rock roadway.

Description

Deep soft rock roadway anchoring-U-shaped steel support-after-frame filling cooperative control method
Technical Field
The invention relates to the field of coal mine roadway surrounding rock control, relates to a deep soft rock roadway surrounding rock deformation cooperative control method, and particularly relates to a deep soft rock roadway anchoring-U-shaped steel support-after-frame filling cooperative control method.
Background
Coal resources with the burial depth of less than 1000m in China are very abundant and are mainly distributed in the middle east region. Most coal mines in the area enter deep mining, and the maximum mining depth exceeds 1500 m. Compared with a shallow coal mine, the deep mine has high ground stress, and the surrounding rock of the roadway protrudes to show rheological property and expansibility. After the tunnel is tunneled, the tunnel is characterized by large deformation, long duration and poor stability. In terms of supporting technology, in foreign countries such as the United states and Australia, the well mining coal seam burial depth is mainly bolt supporting; china mainly has various support technologies such as anchor bolt support, section steel support, concrete filled steel tube support and the like. The existing supporting technology solves the deep roadway supporting problem that the occurrence of middle and shallow parts and rock strata is stable and the condition is better, and two or more combined supporting technologies such as anchor bolt supporting, grouting and supporting and the like solve the supporting problem of partial deep roadways, but a plurality of deep roadways have large deformation and need to be repaired for many times.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a deep soft rock roadway anchoring-U-shaped steel support-after-frame filling cooperative control method, which aims to solve the problems of large deformation and large control difficulty of surrounding rocks of a deep soft rock roadway.
According to the embodiment of the invention, the deep soft rock roadway anchoring-U-shaped steel support-post-support filling cooperative control method comprises the following steps:
s1, carrying out geomechanical test on the surrounding rock of the roadway to obtain geomechanical parameters of the surrounding rock;
s2, heading towards the heading direction of the roadway;
s3, based on the geomechanical parameters obtained in S1, carrying out anchoring support on a roadway top plate and a side part by adopting a high-strength anchor rod and/or an anchor cable while tunneling, applying prestress matched with the high-strength anchor rod and/or the anchor cable, and forming a prestress bearing structure section in the roadway surrounding rock;
s4, lagging a distance in the prestressed bearing structure section to support a U-shaped steel bracket, erecting a plurality of U-shaped steel brackets in a roadway, and sequentially connecting and locking to form a U-shaped steel bracket supporting section;
and S5, lagging the supporting section of the section of U-shaped steel bracket for a certain distance, and filling the space between the U-shaped steel bracket and the roadway wall by adopting filling materials to form a filling section.
According to an embodiment of the present invention, in step S1, the performing geomechanical testing on the roadway surrounding rock specifically includes: and carrying out in-situ test on the ground stress, the coal rock strength and the structure of the surrounding rock of the roadway.
According to an embodiment of the present invention, step S2 specifically includes using the tunneling device to tunnel a clearance space toward the head of the roadway, and then using the rear transport device to transport away the crushed coal rock generated by newly-tunneled roadway.
According to an embodiment of the present invention, in step S3, the performing anchor support on the roof and the upper of the roadway by using the high-strength anchor rod and/or the anchor cable while performing the excavation includes drilling anchor holes in the roof and the side wall of the roadway, and performing the anchor support by stirring the resin anchor agent in the anchor holes through the high-strength anchor rod and/or the anchor cable.
According to one embodiment of the invention, in step S3, the yield strength of the anchor rod is above 500 MPa.
According to one embodiment of the invention, in step S4, U-shaped steel supports are laid in rows in the roadway, then supporting nets are laid on the outer sides of the U-shaped steel supports, filling and isolating cloth is laid on the upper portions of the supporting nets, and the filling and isolating cloth and the supporting nets are clamped between the U-shaped steel supports and the roadway wall.
According to one embodiment of the invention, the filling is sequentially arranged at the position of the corresponding filling section along the tunneling direction of the roadway, every two sections of the filling partition cloth are provided with a filling port, and filling materials are filled between the filling partition cloth and the roadway wall from the filling ports by using filling equipment to connect filling pipelines so as to fill the space between the U-shaped steel support and the roadway wall.
According to one embodiment of the invention, the filling material is composed of cement, fly ash, quartz sand, additives and water, is in a fluid state when being filled, fills the space between the U-shaped steel bracket and the rugged roadway wall, and is solidified to form the bearing structure after being filled for a period of time.
According to an embodiment of the invention, in step S4, the erection of the U-shaped steel brackets in the roadway and the sequential connection and locking include connecting adjacent U-shaped steel brackets by using a brace, and locking the joints by using bolts.
According to an embodiment of the present invention, in step S3, bolting and/or bolting cables are/is supported by using one of a single bolt drilling machine, a bolt trolley, a bolting platform or a bolting arm of a heading machine.
One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:
according to the cooperative control method for anchoring-U-shaped steel support-filling behind deep soft rock roadway, disclosed by the embodiment of the invention, by adopting the cooperative control method, high-prestress anchor rod and anchor cable support closely follows a tunneling working face during supporting operation, the U-shaped steel support lags behind the roadway surrounding rock condition by a certain distance, and the U-shaped steel support is filled behind the support by a certain distance, so that the cooperative operation of surrounding rock anchoring, supporting and filling in space and time of the roadway is realized. High-resistance retractable bearing structures are formed inside and on the surface of the roadway surrounding rock through the anchor rod, the anchor cable and the anchor cable, the U-shaped steel support is high-resistance retractable, the filling body transfers stress, cracks are sealed, and the coal rock mass is reinforced, so that the coupling and the cooperation of load transfer and deformation control are realized, and further the large deformation of the deep-well roadway surrounding rock is controlled.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a deep soft rock roadway anchoring-U-shaped steel support-after-frame filling cooperative control method according to an embodiment of the invention;
FIG. 2 is a schematic plan view of a horizontal cross section of a deep soft rock roadway spatial arrangement according to an embodiment of the invention;
fig. 3 is a cross-sectional view schematically illustrating the filling body of fig. 2.
Reference numerals:
the method comprises the following steps of 1-west wing rail large lane, 2-top anchor rod anchor cable, 3-side anchor rod anchor cable, 4-U-shaped steel support, 5-filling body, 6-lane surrounding rock, 7-ground and underground interface, 8-ground filling control system, 9-ground station material silo, 10-gas station, 11-underground first-level transfer station, 12-underground second-level transfer station, 13-tunnel excavation surface transfer station, 14-filling material mixing station and 15-filling pipeline.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of 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 embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The "soft rock" as referred to in the present invention means a weak rock body such as mudstone or sandy mudstone. The soft rock roadway refers to a roadway which has low strength, is loosely and weakly cemented, surrounds a rock roadway or has large deformation in engineering and cannot meet the production requirement.
As shown in fig. 1, an embodiment of the present invention provides a deep soft rock roadway anchoring-U-shaped steel bracket-post-frame filling cooperative control method, including the following steps:
s1, carrying out geomechanical test on the surrounding rock of the roadway, specifically comprising the steps of carrying out ground stress, coal rock strength and structure in-situ test on the surrounding rock of the roadway, and obtaining geomechanical parameters of the surrounding rock.
S2, heading towards the heading direction of the roadway; here, the "heading direction of the roadway" means a direction in which the coal rock layer is excavated toward the roadway.
And S3, based on the geomechanical parameters obtained in S1, carrying out anchoring support on a roadway roof and a roadway upper part by using a high-strength anchor rod and/or an anchor rope while tunneling, for example, carrying out anchoring support on a tunneling section of 1 meter after tunneling for 1 meter, applying prestress matched with the obtained geomechanical parameters, and forming a prestress bearing structure section in the roadway surrounding rock, for example, forming a prestress bearing structure section of 500 meters.
S4, performing U-shaped steel support in the section of the prestressed bearing structure section at a lagging distance, wherein the lagging means that a distance is reserved behind the head of a roadway, the distance is not subjected to U-shaped steel support, for example, the U-shaped steel support is performed forwards at the 450 th meter position of the prestressed bearing structure section with the length of 500 meters, namely, 50 meters of space is reserved without U-shaped steel support, so that tunneling equipment can be arranged in the reserved area with the length of 50 meters, the transportation and space arrangement of supporting materials are convenient, the tunneling equipment is utilized to continuously tunnel forwards, the U-shaped steel supports are required to be erected for supporting at the backward 450 meters of the reserved area, the U-shaped steel support and the roadway tunneling are not interfered with each other and can be performed synchronously, a plurality of U-shaped steel supports are erected in the roadway at intervals and are sequentially connected and locked, the shape and the size of the U, a section of U-shaped steel support supporting section is formed, and the U-shaped steel support has certain retractility, so that the support can bear certain deformation of a roadway.
S5, lagging a section of U-shaped steel support section by a distance, for example, reserving 50 meters backwards from one end close to the head of a roadway in the U-shaped steel support section with the length of 450 meters, filling materials are not filled in the reserved 50 meters, filling support is carried out in the reserved area for 400 meters backwards, and by arranging the reserved area at one end, the U-shaped steel support in front can not be influenced during filling, so that the U-shaped steel support and filling can be carried out simultaneously without mutual interference; filling a mixture of filling materials such as cement, fly ash, quartz sand, additives and water between the U-shaped steel bracket and the roadway wall, filling a space between the U-shaped steel bracket and the roadway wall to form a filling section, and solidifying the filling materials after filling for a period of time to form a bearing structure. In the embodiment, the stability of the surrounding rock of the roadway is kept by utilizing the coupling synergistic effect of the high-strength high-prestress anchor rod and anchor cable anchoring active support, the U-shaped steel support and the U-shaped steel support frame rear filling.
In the supporting operation of the embodiment, the high-prestress anchor rod and anchor cable support follows the tunneling working face, the U-shaped steel support supports and depends on the surrounding rock conditions of the roadway at a certain distance, and the U-shaped steel support supports and supports at a certain distance after the U-shaped steel support is filled behind the U-shaped steel support, so that the cooperative operation of anchoring, erecting and filling the surrounding rock of the roadway is realized. High-resistance retractable bearing structures are formed inside and on the surface of the roadway surrounding rock through the anchor rod, the anchor cable and the anchor cable, the U-shaped steel support is high-resistance retractable, the filling body transfers stress, cracks are sealed, and the coal rock mass is reinforced, so that the coupling and the cooperation of load transfer and deformation control are realized, and further the large deformation of the deep-well roadway surrounding rock is controlled.
Specifically, after the roadway driving is completed, a high prestress is applied by using a high-strength anchor rod and an anchor cable to carry out active support in time; meanwhile, the U-shaped steel bracket is supported at a certain distance behind the anchor rod and anchor cable support, so that conditions are created for filling behind the bracket; and the U-shaped steel bracket is erected at the front, and the U-shaped steel bracket erected at the rear is filled after the bracket is erected. During supporting operation, high-prestress anchor rod and anchor cable supports closely follow a tunneling working face, the lagging distance of the U-shaped steel support supports according to the surrounding rock conditions of the roadway is different and is usually 40-60m, and the lagging U-shaped steel support supports are filled behind the supports within 60m, so that the time-space cooperative operation of anchoring, erecting and filling of the surrounding rock of the roadway is realized. The high-resistance retractable bearing structure is formed by filling the high-prestress anchor rod anchor cable, the U-shaped steel bracket and the bracket into the surrounding rock of the roadway and on the surface of the surrounding rock, the functions of active support of the anchor rod anchor cable, high-resistance retractable of the U-shaped steel bracket, stress transfer of a filling body, crack sealing and coal rock mass reinforcement are fully exerted, and coupling, complementation and cooperation of load transfer and deformation control are realized, so that large deformation of the surrounding rock of the deep-well roadway is controlled.
Coupling cooperative control means that after the roadway is tunneled, a high-strength anchor rod (cable) is supported in time, and high pre-tightening force is applied to realize active support; the high-strength U-shaped steel support is a passive support, can provide higher support resistance and has certain retractility; the post-support filling is that the filling body after the filling body is solidified, an anchor rod and anchor cable support and a U-shaped steel support form a support whole, the functions of active support of the anchor rod and anchor cable, high-resistance contractibility of the U-shaped steel support, stress transfer of the filling body, crack sealing and coal rock mass reinforcement are fully exerted, the coupling, complementation and cooperation of load transfer and deformation control are realized, and the large deformation of the surrounding rock of the deep well roadway is effectively controlled. The control effect is obviously improved, the repair of the tunnel is avoided, and the maintenance cost of the tunnel is greatly reduced.
According to an embodiment of the present invention, step S2 specifically includes using the tunneling device to tunnel a clearance space toward the head of the roadway, and then using the rear transport device to transport away the crushed coal rock generated by newly-tunneled roadway.
According to an embodiment of the present invention, in step S3, the performing anchor support on the roof and the upper of the roadway by using the high-strength anchor rod and/or the anchor cable while performing the excavation includes drilling anchor holes in the roof and the side wall of the roadway, and performing the anchor support by stirring the resin anchor agent in the anchor holes through the high-strength anchor rod and/or the anchor cable.
According to an embodiment of the invention, in step S3, a high-strength anchor rod and an anchor cable are adopted to anchor the roadway head-on top plate and the roadway side wall in time, and a high prestress is applied, wherein the yield strength of the anchor rod is above 500MPa, a prestress bearing structure section is formed in the surrounding rock, the reduction of the strength of the surrounding rock is reduced, the initial expansion failure of the surrounding rock is controlled, and active supporting is realized. The method has the advantages that the bias stress and stress gradient of the shallow part of the surrounding rock are reduced, discontinuous and uncoordinated expansion deformation of the surrounding rock in the anchoring area is inhibited, the reduction of the strength of the surrounding rock is reduced, a prestress bearing structure is formed in the surrounding rock, and active supporting is realized.
In order to facilitate filling of the filling material, according to an embodiment of the present invention, in step S4, U-shaped steel supports are first laid in rows in the roadway, then a supporting net is laid outside the U-shaped steel supports, a filling spacer is laid on the supporting net, the filling spacer and the supporting net are sandwiched between the U-shaped steel supports and the roadway wall, after the filling material is filled between the filling spacer and the roadway wall, the filling spacer bears downward gravity, and at this time, the supporting net is used for supporting, so that the filling spacer can be prevented from falling downward and causing a bulge phenomenon. Here, the support mesh may be a mesh reinforcement. The filling separation cloth can cover the outer surface of the U-shaped steel support to form a corresponding U shape, the length of the filling separation cloth can be selected according to needs, two ends of the filling separation cloth can be plugged before filling, a circular filling opening with the diameter of 200-300 mm is formed in the position, close to the middle, of the filling separation cloth, of course, other parameters can be selected for the diameter of the filling opening, and the embodiment is not limited specifically.
According to one embodiment of the invention, the filling and isolating cloth is laid at the position of the corresponding filling section along the tunneling direction of the roadway, every two sections of the filling and isolating cloth are provided with a filling port, and filling materials are filled between the filling and isolating cloth and the roadway wall from the filling ports by using a filling device to connect filling pipelines so as to fill the space between the U-shaped steel bracket and the roadway wall. The filling material is in a fluid state during filling, can adapt to the rugged roadway surface, and the filling body bears and makes up the outer weakness of the anchor rod pressure arch, repairs the roadway surface pits, avoids local stress concentration damage, and completes roadway anchor rod and anchor cable support-U-shaped steel bracket-filling body coupling cooperative control after the support.
Specifically, the U-shaped steel support is installed by adopting a manual or automatic shed erecting machine and other machines. When in filling, the filling is carried out by using the after-frame filling equipment, and specifically, one of a ground-to-underground automatic filling system, an underground filling system and a grouting pump is adopted.
According to one embodiment of the invention, the filling material is a mixture of cement, fly ash, quartz sand, an additive and water, is in a fluid state when being filled, fills the space between the U-shaped steel bracket and the rugged roadway wall, and is solidified to form the bearing structure after being filled for a period of time.
According to an embodiment of the invention, in step S4, the erection of the U-shaped steel brackets in the roadway and the sequential connection and locking include connecting adjacent U-shaped steel brackets by using a brace, and locking the joints by using bolts. The U-shaped steel support below the bottom plate is fixed by cement solidification, and the front and rear adjacent frames are fixed by steel bars to form a high-resistance contractible U-shaped steel support supporting section, so that a roadway is strongly supported, and the contractible deformation is realized.
According to an embodiment of the present invention, in step S3, the anchor rod and/or anchor cable support is/are constructed by using an anchor rod and anchor cable construction device, wherein the anchor rod and anchor cable construction device is one of a single anchor rod drilling machine, an anchor rod trolley, an anchor rod support platform or a rock drilling arm of a rock drilling machine set.
The invention provides a method for high-prestress anchor rod and anchor cable support, a U-shaped steel bracket and post-support filling cooperative control of deep soft rock roadway surrounding rock.
To better illustrate the invention, a specific example is described below:
the Cumindong mine of the new energy-collecting medium coal GmbH is located in a Huainan mine area of China, the burial depth is 1000m, the top and bottom plates are mainly mudstone, and the content of clay minerals accounts for about 60% of the total content of the minerals. The tunnel is seriously deformed, the phenomena of 'before digging and after repairing, digging and repairing at the same time and repairing repeatedly' happen frequently, the repair loss rate is as high as 90 percent, the tunnel faces the risk of closing, and the tunnel belongs to a typical deep soft rock large deformation tunnel. The following description takes high pre-stressed anchor rod anchor cable anchoring-36U-shaped steel bracket supporting-post filling coupling cooperative control of the West wing rail main roadway of Cumindong mine as an example.
As shown in fig. 2 to fig. 3, the top and bottom plates of the large lane 1 of the wing rail of the chinese-western style are all mudstones, the surrounding rocks 6 of the lane are mudstones, the thickness is large, the clay mineral content is high, the surrounding rocks 6 of the lane are easily weathered and disintegrated when meeting air and water, the surrounding rocks 6 of the lane are broken after excavation, and the surrounding rocks of the lane are deformed due to long-term creep under the action of kilometer burial depth and high stress, so that the supporting of the surrounding rocks 6 of the.
The control method of the embodiment comprises the following steps:
s1, geomechanical test: carrying out in-situ test on the ground stress, the coal rock strength and the structure of the surrounding rock 6 of the large roadway 1 of the west wing rail to obtain geomechanical parameters of the surrounding rock 6, and executing the step S2 after the completion;
s2, tunneling: the tunneling device cuts a row spacing space, the rear transportation device transports the crushed coal rocks generated by the newly tunneled west wing rail main roadway 1 out, and the step S3 is executed after the crushed coal rocks are transported out;
s3, anchoring by using a high-prestress anchor rod and an anchor cable: anchoring a head-on top plate and side parts of the roadway in time by adopting high-strength anchor rods and anchor cables, wherein the top plate adopts a top anchor rod and anchor cable 2, the two sides adopt side anchor rods and anchor cables 3, and high prestress is applied, so that a prestress bearing structure is formed in the surrounding rock 6 of the roadway, the reduction of the strength of the surrounding rock 6 of the roadway is reduced, the initial expansion damage of the surrounding rock 6 of the roadway is controlled, active supporting is realized, and the step S4 is executed after the initial expansion damage is finished;
s4, supporting by a U-shaped steel bracket: supporting a U-shaped steel support 4 about 40m after lagging anchor rod and anchor cable supporting, connecting and locking a plurality of 36U-shaped steels by adopting bracing pieces and related bolts and the like, erecting the steel closely to the wall of a roadway, wherein the spacing between supports is 650mm, and the shape and the size of the steel are matched with the section of the roadway to form a high-resistance contractible 36U-shaped steel support, so that the steel support not only supports the roadway strongly, but also has contractible deformation, and after the process is finished, the step S5 is executed;
s5, filling after a rack: the lagging U-shaped steel support 4 is about 20m, two ends of a roadway pre-filling section are plugged between the U-shaped steel support 4 and a roadway wall, a dry material consisting of cement, coal ash, quartz sand and an additive with small particle size and good fluidity is mixed with water and then filled between the filling spacer cloth and the roadway wall, the filling thickness is 300-350 mm, the space between the U-shaped steel support and the roadway wall is fully filled, a filling body bears and makes up the outer side weak point of an anchor rod pressure arch, a roadway surface depression is repaired, local stress concentration damage is avoided, and the coupling cooperative control of the roadway anchor rod anchor cable support-U-shaped steel support 4-frame back filling body 5 is completed.
The yield strength of the high-strength anchor rod anchored and actively supported by the top plate and the side part high-prestress anchor rod and the anchor cable of the west wing rail main roadway 1 is more than 500MPa, and the high prestress is matched with the strength grade of the high-strength anchor rod.
According to the deep soft rock roadway anchoring-U-shaped steel support-post-erection filling cooperative control method, an automatic shed erecting machine is adopted to install the U-shaped steel support, and three supports can be installed at one time.
The post-frame filling equipment adopts one of a ground-to-underground automatic filling system, an underground filling system and a grouting pump. The filling equipment behind the frame adopts a ground-to-underground automatic filling system, and comprises a ground filling control system 8, a ground charging bin 9, a gas station 10, an underground first-level transfer station 11, an underground second-level transfer station 12, a roadway driving surface transfer station 13, a filling material stirring station 14 and a filling pipeline 15. The ground filling control system 8, the ground station material silo 9 and the gas station 10 are arranged on a ground and underground interface 7, the ground filling control system 8 is started firstly, dry materials are transported to a ground station through a concrete tank truck and are conveyed to the ground station material silo 9 from an air pressing system through the concrete tank truck under pressure; and then, conveying the dry materials to the underground by using wind power through a gas filling station 10, horizontally conveying the dry materials to a first-level underground transfer station 11 by 100-150 m, conveying the dry materials to a second-level underground transfer station 12 through an alloy wear-resistant pipeline and a hose, finally conveying the dry materials to a roadway driving face transfer station 13, adding water into the mixed materials at a filling material stirring station 14 for stirring, finally pumping the mixed materials to a filling site 5 of a west wing rail main roadway 1 through a concrete pump, and performing after-erection filling through a filling pipeline 15. The whole process from a ground station material silo 9 to a filling site 5 of a surrounding rock 6 of an underground roadway is unattended, and 1-2 people patrol; all automatic closed operation along the way is safe and has no dust.
The coupling cooperative control principle of the embodiment is as follows: after the west wing rail main roadway 1 is tunneled, the high-strength anchor rods and the anchor cables are supported in time, and high pre-tightening force is applied to realize active support; the high-strength U-shaped steel bracket 4 is a passive support, can provide higher support resistance and has certain retractility; the post-frame filling is that after the filling body is solidified, the filling body 5, the anchor rod anchor cable (comprising a top anchor rod anchor cable 2 and a side anchor rod anchor cable 3) support and the U-shaped steel support 4 support form a support whole, the functions of active support of the anchor rod anchor cable, high-resistance contractibility of the U-shaped steel support 4, stress transmission of the filling body 5, crack sealing and coal and rock mass strengthening are fully exerted, the coupling, cooperation and complementation of load transmission and deformation control are realized, and the large deformation of the roadway surrounding rock 6 of the deep-well west-wing rail large roadway 1 is effectively controlled.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims (10)

1. A deep soft rock roadway anchoring-U-shaped steel support-post-support filling cooperative control method is characterized by comprising the following steps:
s1, carrying out geomechanical test on the surrounding rock of the roadway to obtain geomechanical parameters of the surrounding rock;
s2, heading towards the heading direction of the roadway;
s3, based on the geomechanical parameters obtained in S1, carrying out anchoring support on a roadway top plate and a side part by adopting a high-strength anchor rod and/or an anchor cable while tunneling, applying prestress matched with the high-strength anchor rod and/or the anchor cable, and forming a prestress bearing structure section in the roadway surrounding rock;
s4, lagging a distance in the prestressed bearing structure section to support a U-shaped steel bracket, erecting a plurality of U-shaped steel brackets in a roadway, and sequentially connecting and locking to form a U-shaped steel bracket supporting section;
and S5, lagging the supporting section of the section of U-shaped steel bracket for a certain distance, and filling the space between the U-shaped steel bracket and the roadway wall by adopting filling materials to form a filling section.
2. The deep soft rock roadway anchoring-U-shaped steel support-post-erection filling cooperative control method according to claim 1, wherein in step S1, the geomechanical test of roadway surrounding rock specifically comprises: and carrying out in-situ test on the ground stress, the coal rock strength and the structure of the surrounding rock of the roadway.
3. The method as claimed in claim 1, wherein the step S2 comprises excavating a clearance space toward the head of the roadway with an excavating device, and then transporting the crushed coal rock generated by the newly excavated roadway with a rear transport device.
4. The method for cooperative control of anchoring-U-shaped steel bracket-post-erection in deep soft rock roadway according to claim 1, wherein in step S3, the anchoring and supporting of the roadway roof and the side wall with high-strength anchor rods and/or anchor cables is carried out while driving, specifically comprising drilling anchor holes in the roadway roof and the side wall, and stirring resin anchoring agent in the anchor holes with high-strength anchor rods and/or anchor cables to carry out the anchoring and supporting.
5. The method for cooperatively controlling anchoring-U-shaped steel bracket-post-frame filling in the deep soft rock roadway according to claim 4, wherein in step S3, the yield strength of the anchor rod is more than 500 MPa.
6. The method of claim 1, wherein in step S4, the U-shaped steel supports are laid in rows in the roadway, then the supporting net is laid on the outer side of the U-shaped steel supports, the filling spacer cloth is laid on the upper portion of the supporting net, and the filling spacer cloth and the supporting net are clamped between the U-shaped steel supports and the roadway wall.
7. The method as claimed in claim 6, wherein the filling partition cloth is laid at a position corresponding to a filling section along a driving direction of the roadway, every section of the filling partition cloth is provided with a filling port, and a filling pipeline is connected by a filling device to fill filling materials between the filling partition cloth and the roadway wall from the filling ports so as to fill a space between the U-shaped steel support and the roadway wall.
8. The method for the cooperative control of the anchoring-U-shaped steel bracket-post filling of the deep soft rock roadway according to claim 7, wherein the filling material is composed of cement, fly ash, quartz sand, an additive and water, is in a fluid state when being filled, fills a space between the U-shaped steel bracket and the wall of the rugged roadway, and is solidified to form a bearing structure after being filled for a period of time.
9. The method for cooperative control of anchoring-U-shaped steel bracket-post-frame filling in deep soft rock roadway according to claim 1, wherein in step S4, the U-shaped steel brackets are erected in the roadway and connected and locked in sequence, specifically comprising connecting adjacent U-shaped steel brackets by using brace, and locking the adjacent U-shaped steel brackets by using bolts.
10. The method for cooperative control of anchoring-U-section steel support-post-filling in deep soft rock roadway as claimed in claim 1, wherein in step S3, bolting and/or anchor cable supporting is performed by using one of single bolt drilling machine, bolt trolley, bolt supporting platform or anchor driving machine group bolt drilling arm.
CN202010244523.6A 2020-03-31 2020-03-31 Deep soft rock roadway anchoring-U-shaped steel support-after-frame filling cooperative control method Pending CN111322093A (en)

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