A method for controlling deformation of soft rock roadway surrounding rock

Abstract

The application provides a method for controlling soft rock roadway surrounding rock deformation, and relates to the technical field of coal mining, and comprises the following steps: laying a supporting net assembly on the surface of the roadway; driving a plurality of rib grouting anchor cables into the rib of the roadway, and driving a plurality of roof grouting anchor cables and a plurality of roof reinforcement grouting anchor cables into the roof of the roadway respectively; and anchoring the rib grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables by using an anchoring agent. The method replaces the traditional anchor rod support with the grouting anchor cable support to increase the anchoring depth, and cooperates with the strong supporting net assembly to strengthen the surface protection strength and stiffness, grouts the surrounding rock through the grouting anchor cable, improves the mechanical properties of the shallow surrounding rock in the roadway, and forms a support body with strong bearing capacity by the shallow surrounding rock in the roadway and the grouting anchor cables with different lengths, so that the deformation and damage of the shallow surrounding rock in the roadway are reduced, and the deformation of the deep surrounding rock in the roadway is controlled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, in particular to a method for controlling deformation of soft rock roadway surrounding rock. BACKGROUND

[0002] With the development of anchor rod and anchor cable support technology, most of the roadways in coal mines are supported by anchor rods and anchor cables alone. Compared with shed support, anchor rod and anchor cable support reduces the labor intensity of workers, improves the roadway excavation speed and support effect, and is conducive to the rapid advancement of fully mechanized mining and fully mechanized caving faces, which has made a great contribution to high yield and high efficiency of coal mines in China.

[0003] Soft rock mine roadways are distributed in many regions such as Gansu, Shanxi, Shandong, and Inner Mongolia. The soft rock roadway has low surrounding rock strength, poor anchorability, and long deformation duration. When anchor rods and anchor cables are used alone, a bearing structure cannot be formed in the shallow part of the roadway surrounding rock, and auxiliary shed and other passive support methods must be used. The cross section of the soft rock mine roadway is different from the rectangular cross section commonly used in most mine roadways, and an arch-shaped cross section is generally used. The arch-shaped cross section is beneficial to the self-stability of the roadway surrounding rock and the support function of the shed. When the roadway is a mining roadway, the arch-shaped cross section leads to complex maintenance technology at the end of the mining face, and methods such as timber roof support are required to ensure the support function of the support equipment, which seriously affects the advancement speed of the working face and the effect of reinforced support. SUMMARY

[0004] The present application provides a method for controlling deformation of soft rock roadway surrounding rock to solve the problems of existing support technology, such as the inability of anchor rods and anchor cables to form a bearing structure in the shallow part of the roadway surrounding rock and low excavation speed.

[0005] The present application provides a method for controlling deformation of soft rock roadway surrounding rock, comprising the following steps:

[0006] Laying a support net assembly on the surface of the roadway;

[0007] Driving a plurality of rib grouting anchor cables into the rib of the roadway and a plurality of roof grouting anchor cables and a plurality of roof reinforcement grouting anchor cables into the roof of the roadway, respectively;

[0008] Using an anchoring agent to anchor the rib grouting anchor cables, the roof grouting anchor cables, and the roof reinforcement grouting anchor cables, respectively;

[0009] Primary tensioning the rib grouting anchor cables, the roof grouting anchor cables, and the roof reinforcement grouting anchor cables according to a first pre-tightening force;

[0010] Spraying the support net assembly;

[0011] Grouting is performed through the side wall grouting anchor cable, the roof grouting anchor cable and the roof reinforcement grouting anchor cable respectively.

[0012] Secondary tension is performed on the side wall grouting anchor cable, the roof grouting anchor cable and the roof reinforcement grouting anchor cable respectively according to a second pre-tightening force.

[0013] According to the method for controlling soft rock roadway surrounding rock deformation provided in the embodiment of the present application, before the step of laying the support net assembly on the surface of the roadway, the following steps are further included:

[0014] The parameters of the side wall grouting anchor cable, the roof grouting anchor cable and the roof reinforcement grouting anchor cable are determined according to the strength and joint fissure development of the side wall, the immediate roof and the main roof of the roadway.

[0015] According to the method for controlling soft rock roadway surrounding rock deformation provided in the embodiment of the present application, the parameters include the length of the anchor cable and the diameter of the anchor cable.

[0016] According to the method for controlling soft rock roadway surrounding rock deformation provided in the embodiment of the present application, before the step of laying the support net assembly on the surface of the roadway, the following steps are further included:

[0017] The grouting material is determined according to the strength and joint fissure development of the side wall, the immediate roof and the main roof of the roadway.

[0018] According to the method for controlling soft rock roadway surrounding rock deformation provided in the embodiment of the present application, before the step of performing the shotcreting on the support net assembly, the following steps are further included:

[0019] Anchor cable tail protection devices are respectively installed on the side wall grouting anchor cable, the roof grouting anchor cable and the roof reinforcement grouting anchor cable.

[0020] According to the method for controlling soft rock roadway surrounding rock deformation provided in the embodiment of the present application, before the step of performing the grouting through the side wall grouting anchor cable, the roof grouting anchor cable and the roof reinforcement grouting anchor cable respectively, the following steps are further included:

[0021] The anchor cable tail protection devices of the side wall grouting anchor cable, the roof grouting anchor cable and the roof reinforcement grouting anchor cable are respectively removed.

[0022] According to the method for controlling soft rock roadway surrounding rock deformation provided in the embodiment of the present application, the step of performing the grouting through the side wall grouting anchor cable, the roof grouting anchor cable and the roof reinforcement grouting anchor cable respectively includes:

[0023] Grouting is performed on each of the side wall grouting anchor cables from bottom to top;

[0024] Grouting the roof grouting anchor cable according to from both sides of the roof to the middle of the roof;

[0025] Grouting the roof grouting anchor cable according to from both sides of the roof to the middle of the roof.

[0026] According to the method for controlling soft rock roadway surrounding rock deformation provided by the embodiment of the application, the length of the roof grouting anchor cable is 4.3m-6.3m, and the length of the roof grouting anchor cable is 6.3m-8.3m.

[0027] According to the method for controlling soft rock roadway surrounding rock deformation provided by the embodiment of the application, the first pre-tightening force is less than the second pre-tightening force, and the second pre-tightening force is 30%-60% of the anchor cable breaking load.

[0028] According to the method for controlling soft rock roadway surrounding rock deformation provided by the embodiment of the application, the support net assembly includes a steel mesh and a wire mesh, and the wire mesh is located between the steel mesh and the surface of the roadway.

[0029] The method for controlling soft rock roadway surrounding rock deformation provided by the embodiment of the application replaces the anchor rod support with the grouting anchor cable support to increase the anchoring depth, cooperates with the strong support net assembly to strengthen the surface protection strength and rigidity, grouts the surrounding rock through the grouting anchor cable, improves the mechanical properties of the shallow surrounding rock in the roadway, and forms a support body with strong bearing capacity by the shallow surrounding rock in the roadway and the grouting anchor cable with different lengths, reduces the deformation and damage of the shallow surrounding rock in the roadway, and further controls the deformation of the deep surrounding rock in the roadway. The invention can avoid the soft rock roadway excavation arch section, greatly improves the roadway excavation speed and the end support technology of the mining face due to the cancellation of the shed support. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is a flow chart of the method for controlling soft rock roadway surrounding rock deformation provided by the embodiment of the application;

[0032] Figure 2 is a sectional structure schematic diagram of the soft rock roadway provided by the embodiment of the application;

[0033] Figure 3 is a structural schematic diagram of the grouting equipment provided by the embodiment of the application.

[0034] Reference signs:

[0035] 1, coal and rock mass of roadway side; 2, immediate roof of roadway; 3, basic roof of roadway; 4, grouting anchor cable of side; 5, support net assembly; 6, roof grouting anchor cable; 7, roof reinforcement support grouting anchor cable; 8, anchor cable tail protection device; 9, grout; 10, grouting reinforced surrounding rock; 11, anchor area of grouting anchor cable of side and roof grouting anchor cable; 12, anchor area of bolting support; 20, grouting pump; 21, rubber tube; 22, grout stop valve; 23, connector; 24, pressure gauge; 25, pressure relief valve; 26, hexagonal head; 27, anchorage device; 28, anchor cable. DETAILED DESCRIPTION

[0036] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0037] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0041] The present application will be described below in conjunction with Figures 1-3 The method for controlling the deformation of the surrounding rock of a soft rock roadway provided by the embodiments of the present application is described.

[0042] Figure 1 The flow chart of the method for controlling the deformation of the surrounding rock of a soft rock roadway provided by the embodiments of the present application is illustrated as shown in Figure 1 The method for controlling the deformation of the surrounding rock of a soft rock roadway includes the following steps:

[0043] Step 100, laying a support net assembly on the surface of the roadway;

[0044] After the roadway is excavated, the support net assembly is laid on the surface of the roadway because the stability of the surface of the roadway is poor. The support net assembly can cooperate with the short grouting anchor cable (i.e. the side wall grouting anchor cable 4 and the roof grouting anchor cable 6) to strengthen the strength and rigidity of the surface of the roadway after the support net assembly is grouted.

[0045] The support net assembly 5 includes a steel mesh and a wire mesh, and the wire mesh is located between the steel mesh and the surface of the roadway. The steel mesh and the wire mesh form a double-layer net, and the steel mesh is preferably a steel mesh woven by φ12mm steel bars. The use of a steel mesh with larger strength can greatly improve the strength and rigidity of the surface protection member. The wire mesh is preferably a diamond-shaped metal mesh woven by 8# iron wire.

[0046] Step 200, driving a plurality of side wall grouting anchor cables 4 into the side wall of the roadway, and driving a plurality of roof grouting anchor cables 6 and a plurality of roof reinforcement support grouting anchor cables 7 into the roof of the roadway, respectively;

[0047] Figure 2 The cross-sectional structure diagram of the soft rock roadway provided by the embodiments of the present application is illustrated as shown in Figure 2 As shown in the figure, the length of the roof reinforcement support grouting anchor cable 7 is greater than the lengths of the side wall grouting anchor cable 4 and the roof grouting anchor cable 6. The lengths of the side wall grouting anchor cable 4 and the roof grouting anchor cable 6 are both 4.3m-6.3m, and the length of the roof reinforcement support grouting anchor cable 7 is 6.3m-8.3m.

[0048] Multiple grouting anchor cables 4 are installed on the sidewalls, perpendicular to the sidewalls of the roadway, with a certain distance between adjacent grouting anchor cables 4. Multiple grouting anchor cables 6 and multiple grouting anchor cables 7 are also installed on the roof, perpendicular to the roof of the roadway. A certain distance is maintained between adjacent roof grouting anchor cables 6 and adjacent roof reinforcement grouting anchor cables 7, with one roof grouting anchor cable 6 placed between every two adjacent roof reinforcement grouting anchor cables 7.

[0049] Step 300: Anchoring agent is used to anchor the grouting anchor cable 4 in the side wall, the grouting anchor cable 6 in the top slab, and the grouting anchor cable 7 in the top slab reinforcement support, respectively.

[0050] The anchoring agent used is a conventional anchoring agent. The anchoring length of the grouting anchor cable 4 in the side slab, the grouting anchor cable 6 in the roof slab, and the grouting anchor cable 7 in the roof slab reinforcement support is 2m. Of course, the anchoring length is not limited to this, and the anchoring lengths of the grouting anchor cable 4 in the side slab, the grouting anchor cable 6 in the roof slab, and the grouting anchor cable 7 in the roof slab reinforcement support can all be different.

[0051] like Figure 1 As shown, the anchorage area 12 of traditional anchor bolts is relatively shallow, while the anchorage areas of the side grouting anchor cable and the top grouting anchor cable of the present invention are relatively deep 11. Since the anchorage depth of the short grouting anchor cable (i.e., the side grouting anchor cable 4 and the top grouting anchor cable 6) is significantly increased compared with the depth of the anchorage area 12 of traditional anchor bolts, a larger area of ​​surrounding rock is shared for bearing, which improves the stability of the support body.

[0052] Step 400: Perform initial tensioning of the grouting anchor cable 4 in the side slab, the grouting anchor cable 6 in the top slab, and the grouting anchor cable 7 in the top slab reinforcement support according to the first pre-tensioning force;

[0053] The initial pre-tensioning force is set at its maximum value without damaging the anchor ends of each grouting anchor cable. Specifically, the initial pre-tensioning force for the grouting anchor cable 4 in the side slab is set at its maximum value without damaging the anchor ends of the grouting anchor cable 4 in the side slab, the initial pre-tensioning force for the grouting anchor cable 6 in the top slab is set at its maximum value without damaging the anchor ends of the grouting anchor cable 6 in the top slab, and the initial pre-tensioning force for the grouting anchor cable 7 in the top slab reinforcement support is set at its maximum value without damaging the anchor ends of the grouting anchor cable 7 in the top slab reinforcement support.

[0054] Step 500: Apply shotcrete to the support mesh assembly;

[0055] By spraying grout onto the support mesh components, the sprayed grout 9 adheres to the surface of the tunnel and the support mesh components, ultimately encapsulating the support mesh components internally. After the grout 9 solidifies, it forms a support structure with high load-bearing capacity. The thickness of the sprayed grout is 50mm-100mm, and the specific thickness is determined according to actual needs.

[0056] Step 600, respectively through the help of grouting anchor cable 4, roof grouting anchor cable 6 and roof reinforcement support grouting anchor cable 7 grouting;

[0057] The help of grouting anchor cable 4 can grout the coal and rock mass 1 of the roadway side, so as to reinforce the coal and rock mass 1 of the roadway side. The roof grouting anchor cable 6 and the roof reinforcement support grouting anchor cable 7 can grout the surrounding rock of the roadway top, so as to reinforce the surrounding rock of the roadway top. The corresponding surrounding rock is grouted by the help of grouting anchor cable 4, roof grouting anchor cable 6 and roof reinforcement support grouting anchor cable 7, so that the grouting reinforced surrounding rock 10 is reinforced, the mechanical properties of the surrounding rock are improved, and the mechanical properties of the shallow surrounding rock in the roadway are improved obviously. The shallow surrounding rock in the roadway and the grouting anchor cable of different lengths form a support body with strong bearing capacity, reduce the deformation and damage of the shallow surrounding rock in the roadway, and further control the deformation of the deep surrounding rock in the roadway.

[0058] Figure 3 The structure diagram of the grouting device provided by the embodiment of the application is illustrated as follows, Figure 3 As shown in the figure, the grouting process adopts the grouting device for grouting, the grouting device includes a grouting pump 20, a rubber pipe 21, a stop valve 22 and a connector 23, the grouting pump 20 is provided with a pressure gauge 24 and a pressure relief valve 25, the grouting outlet of the grouting pump 20 is communicated with the stop valve 22 through the rubber pipe 21, the stop valve 22 is communicated with the connector 23, the connector 23 is communicated with the tail of the anchor cable 28 through a hexagonal head 26, and the anchoring end of the anchor cable 28 is provided with an anchor device 27. Since the grouting device is a conventional grouting device, the specific structure will not be described in detail here.

[0059] Step 700, the help of grouting anchor cable 4, roof grouting anchor cable 6 and roof reinforcement support grouting anchor cable 7 are respectively subjected to secondary tension according to the second pre-tightening force.

[0060] The second pre-tightening force of the secondary tension is greater than the first pre-tightening force of the primary tension, that is, the first pre-tightening force is less than the second pre-tightening force, and the second pre-tightening force is 30%-60% of the anchor cable breaking load. After the secondary tension of the anchor cable, the construction of one row of supports of the roadway is completed, the cutting coal and rock mass is excavated, and the next row of support construction is carried out. The grouting reinforced surrounding rock 10 and the help of grouting anchor cable 4, roof grouting anchor cable 6 and roof reinforcement support grouting anchor cable 7 form a support body with high bearing capacity, control the deformation and damage of the coal and rock mass 1 of the roadway side, the immediate roof 2 of the roadway and the basic roof 3 of the roadway, maintain the stability thereof, and meet the needs of the safety production of the working face.

[0061] The method for controlling soft rock roadway surrounding rock deformation provided by the embodiment of the present application replaces the anchor rod support with the grouting anchor cable support to increase the anchoring depth, and cooperates with the strong support net assembly to strengthen the support strength and rigidity, grouts the surrounding rock through the grouting anchor cable, improves the mechanical properties of the shallow surrounding rock in the roadway, and forms a support body with strong bearing capacity by the shallow surrounding rock in the roadway and the grouting anchor cable with different lengths, so as to reduce the deformation and damage of the shallow surrounding rock in the roadway, and further control the deformation of the deep surrounding rock in the roadway. The method for controlling soft rock roadway surrounding rock deformation can avoid the soft rock roadway tunneling arch section, and greatly improves the tunneling speed and the end support technology of the mining face due to the cancellation of the shed support.

[0062] In the embodiment of the present application, before the step of laying the support net assembly 5 on the surface of the roadway, the following steps are further included:

[0063] The parameters of the sidewall grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement support grouting anchor cable 7 are determined according to the strength and joint fissure development of the sidewall, the immediate roof 2 and the main roof 3 of the roadway.

[0064] Before the construction, the geological production conditions of the roadway need to be analyzed first, that is, the strength and joint fissure development of the sidewall, the immediate roof 2 and the main roof 3 of the roadway are obtained, which provides a basis for determining the parameters of the sidewall grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement support grouting anchor cable 7. The strength and joint fissure development can be obtained by using a small aperture geotechnical parameter testing instrument, of course, other parameter testing instruments can also be used. The parameters include the length of the anchor cable and the diameter of the anchor cable, of course, the specific types of the parameters are not limited to this, and other parameters can also be included.

[0065] In the embodiment of the present application, before the step of laying the support net assembly 5 on the surface of the roadway, the following steps are further included:

[0066] The grouting material is determined according to the strength and joint fissure development of the sidewall, the immediate roof 2 and the main roof 3 of the roadway.

[0067] Before the construction, a suitable grouting material also needs to be selected, which is determined according to the strength and joint fissure development of the sidewall, the immediate roof 2 and the main roof 3 of the roadway. The strength improvement of the soft rock after grouting is analyzed through laboratory test, and a suitable grouting material is selected to ensure that the surrounding rock after grouting can form a support body with high bearing capacity with the grouting anchor cable.

[0068] In the embodiment of the present application, before the step of spraying the support net assembly 5, the following steps are further included:

[0069] The tail protection device 8 is installed on the tail of the grouting anchor cable.

[0070] The support net assembly 5 is grouted to close the roadway. Before the step of grouting the support net assembly 5, the tail protection device 8 is installed on the tail of the grouting anchor cable.

[0071] In the embodiment of the present application, the tail protection device 8 is installed on the tail of the grouting anchor cable before the step of grouting the support net assembly 5. Therefore, before the step of grouting by the hanging wall grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7, the following steps are further included:

[0072] The tail protection device 8 of the hanging wall grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7 is removed respectively.

[0073] In the embodiment of the present application, the step of grouting by the hanging wall grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7 includes:

[0074] Grouting each hanging wall grouting anchor cable 4 from the bottom to the top;

[0075] Grouting each roof grouting anchor cable 6 from the two sides of the roof to the middle of the roof;

[0076] Grouting each roof reinforcement grouting anchor cable 7 from the two sides of the roof to the middle of the roof.

[0077] It should be noted that the grouting pressure should be paid attention to during the grouting process, and the grouting should be stopped in time once the leakage or other conditions are found.

[0078] The following will be described in combination with Figures 1 to 3 One specific embodiment of the present application is described as follows, as shown in the accompanying drawings. Figures 1 to 3 The method for controlling the deformation of the surrounding rock of the soft rock roadway includes the following steps:

[0079] The parameters of the hanging wall grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7 are determined according to the strength and joint fissure development of the hanging wall, the immediate roof 2 and the main roof 3 of the roadway.

[0080] The grouting material is determined according to the strength and joint fissure development of the hanging wall, the immediate roof 2 and the main roof 3 of the roadway.

[0081] The support net assembly 5 is laid on the surface of the roadway.

[0082] The rib part grouting anchor cable 4 is driven into the rib part of the roadway, and the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7 are driven into the roof of the roadway, respectively;

[0083] The rib part grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7 are anchored by using anchoring agent, respectively;

[0084] The rib part grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7 are initially tensioned according to the first pre-tightening force;

[0085] The anchor cable tail protection device 8 is installed on the rib part grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7, respectively;

[0086] The support net assembly 5 is sprayed;

[0087] The anchor cable tail protection device 8 is removed from the rib part grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7, respectively;

[0088] The rib part grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7 are grouted, respectively;

[0089] The rib part grouting anchor cable 4, the roof grouting anchor cable 6 and the roof reinforcement grouting anchor cable 7 are secondarily tensioned according to the second pre-tightening force, respectively.

[0090] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of controlling deformation of soft rock roadway surrounding rock, characterized in that, The method comprises the following steps: laying a support net assembly on the surface of the roadway; driving a plurality of ribbed grouting anchor cables into the rib of the roadway and a plurality of roof grouting anchor cables and a plurality of roof reinforcement grouting anchor cables into the roof of the roadway; anchoring the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables with anchoring agents; primary tensioning the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables according to a first pre-tensioning force; spraying the support net assembly; grouting through the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables; secondary tensioning the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables according to a second pre-tensioning force; before the step of laying the support net assembly on the surface of the roadway, the method further comprises the following steps: determining the parameters of the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables according to the strength and joint fissure development of the rib, immediate roof and basic roof of the roadway; the length of the ribbed grouting anchor cables and the roof grouting anchor cables is 4.3m-6.3m, and the length of the roof reinforcement grouting anchor cables is 6.3m-8.3m; the support net assembly comprises a steel mesh and a wire mesh, and the wire mesh is located between the steel mesh and the surface of the roadway.

2. The method of claim 1, wherein, The parameters include the length and diameter of the anchor cables.

3. The method of claim 1, wherein, before the step of laying the support net assembly on the surface of the roadway, the method further comprises the following steps: determining the grouting material according to the strength and joint fissure development of the rib, immediate roof and basic roof of the roadway.

4. The method of claim 1 to 3, wherein, before the step of spraying the support net assembly, the method further comprises the following steps: installing an anchor cable tail protection device for the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables respectively.

5. The method of claim 4, wherein, before the step of grouting through the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables respectively, the method further comprises the following steps: removing the anchor cable tail protection device for the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables respectively.

6. The method of claim 1 to 3, wherein, The step of grouting through the ribbed grouting anchor cables, the roof grouting anchor cables and the roof reinforcement grouting anchor cables respectively comprises: grouting each of the ribbed grouting anchor cables from bottom to top; grouting each of the roof grouting anchor cables from both sides of the roof to the middle of the roof; grouting each of the roof reinforcement grouting anchor cables from both sides of the roof to the middle of the roof.

7. The method of claim 1 to 3, wherein, The first pre-tensioning force is smaller than the second pre-tensioning force, and the second pre-tensioning force is 30%-60% of the breaking load of the anchor cable.

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