Method for uncovering coal seam group with zero net distance in gas tunnel

Abstract

The present application relates to the technical field of gas tunnel construction, and particularly relates to a method for uncovering zero-clearance coal seam group in gas tunnel, wherein the advanced geological prediction is performed on the geological body at the target face to obtain the geological data information of the geological body, then the outburst prevention treatment is performed on the zero-clearance coal seam group at the first face according to the geological data information, and the treatment effect of the gas outburst danger is obtained, then the uncovering scheme of the zero-clearance coal seam group is obtained according to the treatment effect of the gas outburst danger, finally the uncovering construction is performed on the zero-clearance coal seam group according to the uncovering scheme, the geological data information of the geological body is obtained through the advanced geological prediction, then the outburst prevention treatment is performed on the zero-clearance coal seam group according to the geological data information, the treatment effect of the gas outburst danger is obtained, then the uncovering scheme of the zero-clearance coal seam group is obtained according to the treatment effect of the gas outburst danger, the uncovering construction can be performed on the zero-clearance coal seam group, and the technical defect that the zero-clearance coal seam group cannot be safely constructed is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas tunnel construction, in particular to a coal uncovering method for a zero-clearance coal seam group of a gas tunnel. BACKGROUND

[0002] In the construction process of a gas-containing highway tunnel, coal uncovering operation needs to be performed on the coal seam in front of the working face of the gas tunnel. In the Technical Code for Design and Construction of Highway Gas Tunnels, the definition of coal uncovering operation is that the longitudinal length from the start of the excavation face to the distance of 5m away from the coal seam is the coal uncovering process, which is started when the distance between the excavation face and the coal seam is 20m. During the entire coal uncovering process, the anti-outburst coal uncovering workflow needs to be performed. However, the technology in the foregoing example is mainly used for single coal seam, and when facing multi-layer composite coal seam group and multi-layer zero-clearance coal seam group, the related technology cannot be directly used for safe construction. SUMMARY

[0003] The main purpose of the present application is to provide a coal uncovering method for a zero-clearance coal seam group of a gas tunnel, which aims to solve the technical problem that the related technology cannot be directly used for safe construction when facing multi-layer composite coal seam group and multi-layer zero-clearance coal seam group.

[0004] To achieve the purpose, in a first aspect, the present application provides a coal uncovering method for a zero-clearance coal seam group of a gas tunnel, the zero-clearance coal seam group is formed in a geological body, and the gas tunnel can pass through the zero-clearance coal seam group;

[0005] The method comprises the following steps:

[0006] Performing advanced geological prediction on the geological body at a target working face to obtain geological data information of the geological body; wherein the minimum distance between the target working face and the zero-clearance coal seam group is a preset target distance;

[0007] According to the geological data information, at least one anti-outburst treatment is performed on the zero-clearance coal seam group at a current working face, and the treatment effect of the gas outburst danger is obtained; wherein the minimum distance between the current working face and the zero-clearance coal seam group is a current distance, and the current distance is less than the preset target distance;

[0008] According to the treatment effect of the gas outburst danger, a coal uncovering scheme for the zero-clearance coal seam group is obtained;

[0009] According to the coal uncovering scheme, the zero-clearance coal seam group is subjected to coal uncovering construction.

[0010] Optionally, the working face comprises a first working face, and the current distance between the first working face and the zero-clearance coal seam group is a first target distance;

[0011] Before the step of performing at least one outburst prevention treatment on the zero-clearance coal seam group at the current working face according to the geological data information and obtaining a gas outburst danger treatment effect, the method further comprises:

[0012] According to the geological data information, the gas tunnel is excavated from the target working face to the first working face.

[0013] The step of performing at least one outburst prevention treatment on the zero-clearance coal seam group at the current working face according to the geological data information and obtaining a gas outburst danger treatment effect comprises:

[0014] According to the geological data information, the first outburst prevention treatment is performed on the zero-clearance coal seam group at the first working face, and a gas outburst danger treatment effect is obtained.

[0015] Optionally, the step of performing the first outburst prevention treatment on the zero-clearance coal seam group at the first working face according to the geological data information and obtaining a gas outburst danger treatment effect comprises:

[0016] According to the geological data information, the first outburst prevention treatment is performed on the zero-clearance coal seam group at the first working face, and corresponding current treatment data is obtained; wherein the current treatment data comprises a ton gas content and a drilling cuttings gas index K1 value of the zero-clearance coal seam group corresponding to the first working face after the first outburst prevention treatment.

[0017] According to the current treatment data, a treatment effect of the zero-clearance coal seam group is obtained, and the gas outburst danger treatment effect is obtained.

[0018] Optionally, the step of obtaining the treatment effect of the zero-clearance coal seam group according to the current treatment data and obtaining the gas outburst danger treatment effect comprises:

[0019] According to the current treatment data, the zero-clearance coal seam group is inspected, and a corresponding current treatment effect is obtained.

[0020] According to the current treatment effect, it is determined whether the corresponding zero-clearance coal seam group is outburst.

[0021] When the zero-clearance coal seam group is outburst, the step of performing the first outburst prevention treatment on the zero-clearance coal seam group at the first working face according to the geological data information and obtaining corresponding current treatment data is returned to be executed until the zero-clearance coal seam group is not outburst, and the gas outburst danger treatment effect is obtained.

[0022] Optionally, the working face further comprises a second working face, the current distance between the second working face and the zero-distance coal seam group is a second target distance, and the second target distance is less than the first target distance.

[0023] After the step of determining whether the corresponding zero-distance coal seam group is outburst according to the current control effect, the method further comprises:

[0024] When the zero-distance coal seam group is not outburst, the second working face is excavated from the first working face;

[0025] According to the geological data information, a first control data corresponding to the zero-distance coal seam group is obtained by detecting the outburst danger of the zero-distance coal seam group at the second working face; wherein the first control data comprises the ton gas content and the drilling cuttings gas index K1 value of the zero-distance coal seam group at the second working face.

[0026] According to the first control data, the zero-distance coal seam group is tested, and a first control effect corresponding to the zero-distance coal seam group is obtained.

[0027] According to the first control effect, an outburst result of the corresponding zero-distance coal seam group is obtained.

[0028] Optionally, the step of obtaining the outburst result of the corresponding zero-distance coal seam group according to the first control effect comprises:

[0029] According to the first control effect, it is determined whether the corresponding zero-distance coal seam group is outburst.

[0030] When the zero-distance coal seam group is outburst, a second control data corresponding to the zero-distance coal seam group is obtained by performing a second outburst prevention control on the zero-distance coal seam group at the second working face; wherein the second control data comprises the ton gas content and the drilling cuttings gas index K1 value of the second working face after the second control.

[0031] According to the second control data, the zero-distance coal seam group is tested, and a second control effect corresponding to the zero-distance coal seam group is obtained.

[0032] According to the second control effect, it is determined whether the corresponding zero-distance coal seam group is outburst.

[0033] When the zero-distance coal seam group is outburst, the step of performing the outburst prevention control on the zero-distance coal seam group at the second working face and obtaining the second control data is returned to be executed until all the zero-distance coal seam groups are not outburst.

[0034] When the zero-distance coal seam group is not outburst, an outburst result of the corresponding zero-distance coal seam group is obtained.

[0035] Optionally, when the zero net distance coal seam group is not outburst, then the step of excavating from the first working face to the second working face includes:

[0036] When the zero net distance coal seam group is not outburst, then the geological body within the first target distance is divided into at least two cycle footage sections according to the excavation direction of the tunnel;

[0037] Excavate one cycle footage section at the first working face to form a first construction face;

[0038] Test the zero net distance coal seam group at the first construction face and determine whether the corresponding zero net distance coal seam group is outburst;

[0039] When the zero net distance coal seam group is outburst, then the zero net distance coal seam group is subjected to third outburst prevention treatment at the first construction face, and the step of testing the zero net distance coal seam group at the first construction face and determining whether the corresponding zero net distance coal seam group is outburst is returned to execute until the zero net distance coal seam group is not outburst;

[0040] When the zero net distance coal seam group is not outburst, then the first construction face is taken as the first working face, and the step of excavating one cycle footage section at the first working face to form a first construction face is returned to execute until all the cycle footage sections are excavated to form the second working face.

[0041] Optionally, the step of performing coal uncovering construction on the zero net distance coal seam group according to the coal uncovering scheme includes:

[0042] According to the coal uncovering scheme, the zero net distance coal seam group is subjected to advanced support at the second working face;

[0043] The zero net distance coal seam group is taken as a single coal seam, and the coal uncovering construction is completed.

[0044] Optionally, the step of taking the zero net distance coal seam group as a single coal seam and completing the coal uncovering construction includes:

[0045] The zero net distance coal seam group is taken as a single coal seam, and the single coal seam is subjected to coal uncovering construction until a third working face is formed after a third target distance of the single coal seam is passed through;

[0046] Test the geological body at the third working face and obtain a current parameter of the geological body; wherein the current parameter includes the ton gas content of the geological body corresponding to the third working face and the drill cuttings gas index K1 value;

[0047] Determine whether the current parameter meets a preset index;

[0048] When the current parameter does not meet the preset index, the third working face carries out fourth outburst prevention management on the geological body, and returns to execute the step of testing the third working face on the geological body and obtaining the current parameter of the geological body until the current parameter meets the preset index.

[0049] When the current parameter meets the preset index, the third working face continues to excavate and construct.

[0050] Optionally, before the step of carrying out at least one outburst prevention management on the zero-clearance coal group at the working face according to the geological data information and obtaining the gas outburst hazard management effect, the method further comprises:

[0051] According to the geological data information, parameter information of each coal seam in the coal group is obtained, wherein the parameter information comprises a first minimum distance corresponding to each zero-clearance coal group and a second minimum distance between adjacent two zero-clearance coal groups.

[0052] According to the parameter information, the zero-clearance coal group is selected from the zero-clearance coal group according to a preset parameter, wherein the preset parameter comprises a first minimum distance corresponding to each coal seam of a standard zero-clearance coal group and a second minimum distance between adjacent two coal seams.

[0053] The technical scheme of the present application first carries out advanced geological prediction on the target working face to obtain geological data information of the geological body, then carries out outburst prevention management on the zero-clearance coal group at the first working face according to the geological data information and obtains the gas outburst hazard management effect, then obtains the coal uncovering scheme of the zero-clearance coal group according to the gas outburst hazard management effect, and finally carries out coal uncovering construction on the zero-clearance coal group according to the coal uncovering scheme. In the specific implementation, the geological data information of the geological body is obtained through advanced geological prediction, then the outburst prevention management is carried out on the zero-clearance coal group according to the geological data information and the gas outburst hazard management effect is obtained, then the coal uncovering scheme of the zero-clearance coal group is obtained according to the gas outburst hazard management effect, so that the technical personnel can carry out coal uncovering construction on the zero-clearance coal group when facing the zero-clearance coal group, and the technical defect that the related technology cannot directly use the related technology for safe construction when facing the zero-clearance coal group is solved. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below only show some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0055] Figure 1 Flow chart of the gas tunnel zero net distance coal seam group uncovering method of the present application example;

[0056] Figure 2 For Figure 1 Flow chart of step S300 of the present application example;

[0057] Figure 3 For Figure 2 Flow chart of step S320 of the present application example;

[0058] Figure 4 For Figure 3 Flow chart of step S327 of the present application example;

[0059] Figure 5 For Figure 4 Flow chart of step S400 of the present application example;

[0060] Figure 6 For Figure 5 Flow chart of step S420 of the present application example;

[0061] Figure 7 Flow chart of some embodiments of the present application example;

[0062] Figure 8 Flow chart of still some embodiments of the present application example;

[0063] Figure 9 Structural schematic diagram of the zero net distance coal seam group of the present application example.

[0064] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0066] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, motion condition, etc. between mechanisms in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0067] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the terms in the present application can be understood according to the specific circumstances.

[0068] In addition, if the present application has a description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. For example, "A and / or B" includes A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0069] The inventive concept of the present application will be further illustrated below in conjunction with some specific embodiments.

[0070] The present application proposes a gas tunnel zero net distance coal seam group uncovering method.

[0071] As shown in Figures 1 to 9 An embodiment of the gas tunnel zero net distance coal seam group uncovering method of the present application is proposed.

[0072] In this embodiment, please refer to Figure 1 The gas tunnel zero net distance coal seam group uncovering method of the present application, the zero net distance coal seam group is formed in a geological body, and the gas tunnel can pass through the zero net distance coal seam group;

[0073] The method comprises the following steps:

[0074] S100, performing advanced geological prediction on the target working face to the geological body to obtain geological data information of the geological body; wherein the minimum distance between the target working face and the zero-clearance coal seam group is a preset target distance;

[0075] In the embodiment, the advanced geological prediction can be performed by using a TSP, an advanced drilling, or the like, but is not limited thereto. In the exemplary technology, the obtained geological data information of the geological body at least includes a geological body material composition and a hardness integrity of the geological body, a minimum clear distance of each coal seam in the coal seam group (i.e., a thickness of the coal seam), a minimum clear distance between two adjacent coal seams (i.e., a thickness of the geological body between the coal seams), a ton gas content corresponding to the target working face, a drilling cuttings gas index K1 value, a coal seam firmness coefficient, and a coal seam damage type, and the like.

[0076] It should be particularly and explicitly noted that, in the exemplary technology, the preset target distance is 20 m.

[0077] S200, performing at least one outburst prevention treatment on the current working face to the zero-clearance coal seam group according to the geological data information, and obtaining a gas outburst hazard treatment effect; wherein a minimum distance between the current working face and the zero-clearance coal seam group is a current distance, and the current distance is less than the preset target distance.

[0078] In the embodiment, when the zero-clearance coal seam is treated, a hole is drilled in the geological body, an external discharge pipeline is installed in the hole, and the gas is discharged to reduce the gas content, so as to achieve the purpose of meeting the construction requirements.

[0079] It should be particularly and explicitly noted that, in the exemplary technology, the first target distance is 10 m.

[0080] In the exemplary technology, before the step S200 is performed, the tunnel is excavated from the target working face to the first working face, and in the process of excavating the tunnel from the target working face to the first working face, a corresponding excavation construction scheme should be formulated according to the geological data obtained in the step S100. In formulating the excavation construction scheme, a corresponding excavation construction scheme should be formulated according to the stability and integrity of the geological body where the gas tunnel is located. In the embodiment, the excavation construction scheme for excavating the tunnel from the target working face to the second working face is preferably constructed by using a bench method. In the excavation construction by using the bench method, the excavation construction is preferably performed by using a cycle footage, so that the construction safety in the process of excavating the tunnel from the target working face to the first working face can be ensured. In the embodiment, the excavation construction is preferably performed by using a mechanical crushing excavation.

[0081] S300, obtaining a coal uncovering scheme for the zero-clearance coal seam group according to the gas outburst danger control effect;

[0082] In the embodiment, when the coal uncovering scheme is obtained, the number of coal seam groups, the positions of coal seams, the number of coal seams in each coal seam group, the ton gas content corresponding to the first working face at the time and the drilling cuttings gas index K1 value and other data of the zero-clearance coal seam group need to be determined. When all these data are determined, the coal uncovering scheme for the zero-clearance coal seam group is obtained.

[0083] S400, performing coal uncovering construction on the zero-clearance coal seam group according to the coal uncovering scheme.

[0084] In the embodiment, first, the geological data information of the geological body is obtained by performing advanced geological prediction on the target working face. Then, the outburst prevention control is performed on the zero-clearance coal seam group at the first working face according to the geological data information, and the gas outburst danger control effect is obtained. Then, the coal uncovering scheme for the zero-clearance coal seam group is obtained according to the gas outburst danger control effect. Finally, the coal uncovering construction is performed on the zero-clearance coal seam group according to the coal uncovering scheme. In the specific implementation of the present application, the geological data information of the geological body is obtained by performing advanced geological prediction. Then, the outburst prevention control is performed on the zero-clearance coal seam group according to the geological data information, and the gas outburst danger control effect is obtained. Then, the coal uncovering scheme for the zero-clearance coal seam group is obtained according to the gas outburst danger control effect. When the zero-clearance coal seam group is encountered, the coal uncovering construction can be performed on the zero-clearance coal seam group, thereby solving the technical defect that the related technology cannot directly use the related technology to perform safe construction when the zero-clearance coal seam group is encountered.

[0085] In some embodiments, the working face includes a first working face, and a current distance between the first working face and the zero-clearance coal seam group is a first target distance.

[0086] Before the step of performing at least one outburst prevention control on the zero-clearance coal seam group at the current working face according to the geological data information and obtaining the gas outburst danger control effect, the method further includes:

[0087] A100, excavating and constructing a gas tunnel from the target working face to the first working face according to the geological data information;

[0088] In the embodiment, when the gas tunnel is excavated and constructed from the target working face to the first working face, the bench method can be used to excavate by means of cyclic footage. For example, the specific excavation method includes but is not limited to mechanical excavation. By this excavation method, the safety hazard of inducing gas explosion in the excavation process due to blasting can be avoided in the specific implementation of the present application.

[0089] According to the geological data information, the step of carrying out at least one outburst prevention treatment on the zero net distance coal seam group at the current working face and obtaining the gas outburst danger treatment effect, comprises:

[0090] S200, according to the geological data information, the first outburst prevention treatment is carried out on the zero net distance coal seam group at the first working face, and the gas outburst danger treatment effect is obtained.

[0091] In some embodiments, according to the geological data information, the step of carrying out outburst prevention treatment on the zero net distance coal seam group at the first working face and obtaining the gas outburst danger treatment effect, comprises:

[0092] S310, according to the geological data information, the first outburst prevention treatment is carried out on the zero net distance coal seam group at the first working face, and the corresponding current treatment data is obtained; wherein the current treatment data includes the ton gas content and the drilling gas index K1 value of the zero net distance coal seam group corresponding to the first working face after the first outburst prevention treatment;

[0093] In this embodiment, in the specific implementation, when the first outburst prevention treatment is carried out, the preferred way is to drill a hole in the geological body at the first working face, and after the drilling is completed, the pipeline discharge method is used for discharge until the ton gas content and the drilling gas index K1 value and other data meet the preset index.

[0094] S320, according to the current treatment data, the treatment effect corresponding to the zero net distance coal seam group is obtained, and the gas outburst danger treatment effect is obtained.

[0095] In this embodiment, in the specific implementation, according to the treatment data, the corresponding treatment effect of the zero net distance coal seam group is obtained, the ton gas content and the drilling gas index K1 value and other data are obtained, and the gas outburst danger treatment effect is obtained.

[0096] In some embodiments, according to the current treatment data, the corresponding treatment effect of the zero net distance coal seam group is obtained, and the gas outburst danger treatment effect is obtained.

[0097] S321, according to the current treatment data, the zero net distance coal seam group is inspected, and the corresponding current treatment effect is obtained;

[0098] In this embodiment, when the zero net distance coal seam group is inspected, the ton gas content and the drilling gas index K1 value and other data of the zero net distance coal seam group are mainly inspected.

[0099] S322, according to the current treatment effect, it is judged whether the corresponding zero net distance coal seam group is outburst;

[0100] In the embodiment, in actual implementation, it is mainly judged whether the ton gas content and the drilling cuttings gas index K1 value and other data exceed the related contents recorded in the Technical Code for Design and Construction of Highway Gas Tunnels - JTG / T 3374-2020.

[0101] S323, when the zero net distance coal group is outburst, then return to execute the step of performing the first outburst prevention treatment on the zero net distance coal group according to the geological data information at the first working face, and obtaining the corresponding current treatment data, until the zero net distance coal group is not outburst, and the gas outburst danger treatment effect is obtained.

[0102] In the embodiment, when outburst, then the outburst prevention treatment needs to be continued, and the process of the outburst prevention treatment is that once the treatment is performed, one judgment is performed, if at least one of the ton gas content and the drilling cuttings gas index K1 value and other data after the re-treatment does not meet the related provisions of the related contents recorded in the Technical Code for Design and Construction of Highway Gas Tunnels - JTG / T 3374-2020, the treatment is continued, until all the data meet the provisions, and the treatment effect can meet the preset index.

[0103] In some embodiments, the working face further includes a second working face, and a current distance between the second working face and the zero net distance coal group is a second target distance, the second target distance is less than the first target distance.

[0104] After the step of judging whether the corresponding zero net distance coal group is outburst according to the current treatment effect, the following steps are further included.

[0105] S324, when the zero net distance coal group is not outburst, then excavate from the first working face to the second working face; wherein, a minimum distance between the second working face and the zero net distance coal group is a second target distance, the second target distance is less than the first target distance.

[0106] In the embodiment, the example of the second target distance is 2m.

[0107] S325, detect the outburst danger of the zero net distance coal group at the second working face according to the geological data information, and obtain the corresponding first treatment data; wherein, the first treatment data includes the ton gas content and the drilling cuttings gas index K1 value of the zero net distance coal group obtained at the second working face.

[0108] In the embodiment, in the detection process, the ton gas content and the drilling cuttings gas index K1 value and other data of the zero net distance coal group are directly collected at the second working face.

[0109] S326, according to the first treatment data, test the zero net distance coal group, and obtain the corresponding first treatment effect.

[0110] In the embodiment, according to the first governance data, it is determined whether the ton gas content and the drilling cuttings gas index K1 value and other data meet the relevant provisions recorded in the “Highway Gas Tunnel Design and Construction Technical Specification”-JTG / T 3374-2020, and the first governance effect is obtained according to the comparison and analysis result.

[0111] S327, according to the first governance effect, the outburst result of the corresponding zero net distance coal seam group is obtained.

[0112] In some embodiments, according to the first governance effect, the step of obtaining the outburst result of the corresponding zero net distance coal seam group comprises:

[0113] S327a, according to the first governance effect, it is judged whether the corresponding zero net distance coal seam group is outburst;

[0114] S327b, when the zero net distance coal seam group is outburst, the second prevention and control governance is carried out on the zero net distance coal seam group at the second working face, and the corresponding second governance data is obtained; wherein the second governance data comprises the ton gas content and the drilling cuttings gas index K1 value corresponding to the second working face after the second governance;

[0115] S327c, according to the second governance data, the zero net distance coal seam group is tested, and the corresponding second governance effect is obtained;

[0116] S327d, according to the second governance effect, it is judged whether the corresponding zero net distance coal seam group is outburst;

[0117] S327e, when the zero net distance coal seam group is outburst, the step of carrying out the prevention and control governance on the zero net distance coal seam group at the second working face and obtaining the second governance data is returned to execute until all the zero net distance coal seam groups are not outburst;

[0118] S3227f, when the zero net distance coal seam group is not outburst, the outburst result of the corresponding zero net distance coal seam group is obtained.

[0119] In some embodiments, when the zero net distance coal seam group is not outburst, the step of excavating from the first working face to the second working face comprises:

[0120] S327g, when the zero net distance coal seam group is not outburst, the geological body in the first target distance range is divided into at least two cycle footage sections according to the excavation direction of the tunnel;

[0121] S327h, one cycle footage section is excavated at the first working face to form a first construction face;

[0122] S327i, the zero net distance coal seam group is tested at the first construction face, and it is judged whether the corresponding zero net distance coal seam group is outburst;

[0123] S327j, when the zero net distance coal group is outburst, then the zero net distance coal group is prevented and treated at the first construction face, and the step of judging whether the corresponding zero net distance coal group is outburst is returned to be executed, until the zero net distance coal group is not outburst;

[0124] S327k, when the zero net distance coal group is not outburst, then the first construction face is taken as the first working face, and the step of excavating a cycle footage section at the first working face is returned to be executed to form the first construction face, until all cycle footage sections are excavated to form the second working face.

[0125] In the embodiment, in the specific implementation, by way of example, the tunnel can be effectively ensured to be excavated and constructed under the premise that the construction process in the coal uncovering stage is carried out under the premise that the gas is not outburst, and the safety is improved.

[0126] In some embodiments, according to the coal uncovering scheme, the step of excavating and constructing the zero net distance coal group includes:

[0127] S410, according to the coal uncovering scheme, the zero net distance coal group is pre-supported at the second working face;

[0128] In the embodiment, the pre-supporting mode can be but is not limited to a pre-small-catheter mode, a pipe-shed supporting mode, a grouting supporting mode and the like.

[0129] S420, the zero net distance coal group is taken as a single coal seam, and the coal uncovering construction is completed.

[0130] It needs to be particularly and explicitly stated that in the embodiment, if at least two zero net distance coal groups are included, each zero net distance coal group needs to be taken as a corresponding single coal seam. For example, in the specific implementation, two zero net distance coal groups are included, the two zero net distance coal groups are adjacent and the distance between the two zero net distance coal groups is greater than 10 m, in the construction, the two single coal seams are sequentially and respectively subjected to the coal uncovering construction, and the specific process is that the single coal seam closest to the second working face is taken as a first coal uncovering section, the farther single coal seam is taken as a second coal uncovering section, the first coal uncovering section is subjected to once coal uncovering, until the construction working face completely passes through the first coal uncovering section, then after the coal uncovering is completed, whether the second coal uncovering section is outburst is tested at the construction working face, if the second coal uncovering section is outburst, the second coal uncovering section is treated and excavated to a position 2 m away from the second coal uncovering section after the second coal uncovering section is not outburst, whether the second coal uncovering section is outburst is tested, if the second coal uncovering section is outburst, the second coal uncovering section is continuously treated and excavated to the construction working face passing through the second coal uncovering section after the second coal uncovering section is not outburst, if the second coal uncovering section is not outburst, the construction working face is excavated to a position 2 m away from the second coal uncovering section, whether the second coal uncovering section is outburst is tested, and if the second coal uncovering section is not outburst, the construction working face is excavated to pass through the second coal uncovering section.

[0131] In some embodiments, the zero-clearance coal seam group is taken as a single coal seam, and the steps of the coal uncovering construction are completed, including:

[0132] S421, taking the zero-clearance coal seam group as a single coal seam, and performing the coal uncovering construction on the single coal seam until a third working face is formed after passing through a third target distance of the single coal seam;

[0133] In this embodiment, the example third target distance is the minimum clearance distance between the third working face and the single coal seam or the entire coal seam group. It needs to be particularly and explicitly pointed out that in this embodiment, the example third target distance is 5 m.

[0134] S422, performing the inspection on the geological body at the third working face and obtaining the current parameters of the geological body; wherein the current parameters include the ton gas content and the drilling cuttings gas index K1 value of the geological body corresponding to the third working face;

[0135] It needs to be particularly and explicitly pointed out that in this embodiment, the ton gas content and the drilling cuttings gas index K1 value of the geological body corresponding to the third working face refer to the ton gas content and the drilling cuttings gas index K1 value in the geological body in the unexcavated area in front of the third working face.

[0136] S423, judging whether the current parameters meet the preset index;

[0137] S424, when the current parameters do not meet the preset index, performing the fourth outburst prevention treatment on the geological body at the third working face, and returning to perform the step of performing the inspection on the geological body at the third working face and obtaining the current parameters of the geological body until the current parameters meet the preset index.

[0138] S425, when the current parameters meet the preset index, continuing the excavation construction at the third working face.

[0139] In some embodiments, before the step of performing the outburst prevention treatment on the zero-clearance coal seam group at the first working face according to the geological data information and obtaining the gas outburst danger treatment effect, further comprising:

[0140] A200, obtaining the parameter information of each coal seam in the coal seam group according to the geological data information; wherein the parameter information includes the first minimum clearance distance corresponding to each zero-clearance coal seam group and the second minimum clearance distance between the adjacent two zero-clearance coal seam groups;

[0141] In this embodiment, the example first minimum clearance distance and the example second minimum clearance distance are both the corresponding normal distances.

[0142] A300. According to the parameter information, screen out the zero - net - distance coal seam group from the zero - net - distance coal seam group according to the preset parameters; where the preset parameters include the first minimum net distance corresponding to each coal seam of the standard zero - net - distance coal seam group and the second minimum net distance between adjacent two coal seams.

[0143] In this embodiment, the standard for screening the zero - net - distance coal seam group is to screen based on whether the second minimum net distance between adjacent two coal seams is less than 5m. If the second minimum net distance is less than 5m, then the adjacent at least two coal seams are the zero - net - distance coal seam group.

[0144] In some specific embodiments, when a highway tunnel encounters an outburst coal seam group, when the distance between individual coal seams is greater than 20m, it is implemented according to the specifications. When the effective net distance between coal seams is less than 20m, the coal seam outburst control can be carried out according to this invention.

[0145] When the effective static distance between coal seams is greater than 10m < A < 20m, it can be treated as one layer or as staggered coal seams that meet the requirements.

[0146] Figure 2 ) and the heading face is still in the coal seam; when one of the three situations where the coal seam distance is less than 5m is not satisfied, the coal seam group composed of all coal seams is defined as the 0 - net - distance coal seam group and treated as one coal seam. Natural emission, negative - pressure gas drainage and other methods can be used to reduce the gas content and gas pressure of the coal seam. For example, the C7 and C8 coal seams in the following figure.

[0147] This invention mainly solves the problem that when a coal seam group composed of multiple coal seam groups has a vertical distance between coal seams less than the specification requirements of 10m or 5m and cannot meet the requirements of outburst prevention and control specifications. When the distance between coal seams is less than 5m, for an outburst coal seam group composed of multiple outburst coal seams, this method can provide a reference for outburst coal seam control; when the net distance between coal seams is 5 - 10m, but due to the tunneling method used in tunnel construction (such as the three - bench method or the bench method, or other methods), the minimum rock pillar between the tunnel heading face and the coal seam is less than 5m; although the method meets the 5m requirement, but the previous outburst coal seam has not completed uncovering coal ( Figure 3 ) and the heading face is still in the coal seam. When one of the three situations is not satisfied, it is treated as one layer for gas outburst control. The coal seam group composed of all coal seams is defined as the zero - net - distance coal seam group and treated as one coal seam. Natural emission, negative - pressure gas drainage and other methods can be used to reduce the gas content and gas pressure of the coal seam.

[0148] According to the tunnel design drawings, it is preliminarily judged whether the number of outburst coal seams meets the coal seam group of multi-layer coal seam group. According to the tunnel geological conditions, the appropriate construction method is selected (taking the three-step method as an example), and the geological drilling core is taken at the distance of 20m from the coal seam normal line of the tunnel face, the coal seam thickness and inclination are recorded on site, and the outburst of each coal seam is predicted to judge whether the thickness of the effective rock pillar between the coal seams meets the requirements of 5m and 10m. Combined with the coal outburst danger prediction, it is preliminarily judged whether the coal seam is treated according to the independent coal seam, the adjacent coal seam outburst prevention treatment, or the 0 net distance coal seam treatment.

[0149] Step S201: According to the design drawings, the C5, C6, C7 and C8 coal seams are advanced drilled at the distance of 20m from the C5 normal line.

[0150] Step S202: Preliminary judgment of coal classification: C5 is less than 0.3m, which is treated as non-outburst; C6 is treated as the first layer of coal, and the outburst prevention regulations are strictly implemented; C7-1, C7-2 and C7-3, the distance between the coal seams is less than 5m, which is treated as 0 net distance coal seam group and unified as C7 coal seam; C8-1, 8-2 and C8-3 coal seams, the distance between them is less than 5m, which is treated as 0 net distance coal seam group and unified as C8 coal seam, wherein the distance between C7 and C8 coal seams is less than 10m, which is defined as adjacent coal seam group.

[0151] Step S203: The outburst danger of C6, C7 and C8 coal seams is predicted at the distance of 10m from the normal line of C6 coal seam. All have outburst danger, see Table 1 for details. Outburst measures need to be taken. C6 coal seam is treated as an independent coal seam for outburst prevention according to the requirements of "Technical Specifications for Pre-construction of Highway Tunnels in Other Provinces". C7 and C8 coal seams are treated as adjacent coal seam group for outburst prevention.

[0152] Table 1: Comparison table of coal seam parameters of a certain tunnel:

[0153]

[0154] Step S204: After the outburst prevention treatment of C6 coal seam is completed, the coal uncovering construction is carried out, and the C7-1 coal seam is excavated to the distance of 10m from the normal line after passing through the C6 coal seam.

[0155] Step S205: The danger of C7 and C8 coal seams is predicted. If there is outburst danger, go to S206, if not, go to S207. The relevant parameters of the coal seam are tested to obtain: ton coal gas content, drilling gas index K1 value, coal seam firmness coefficient and coal seam damage type parameters.

[0156] Step S206: Outburst prevention management: According to the obtained coal seam related parameters, the gas outburst prevention scheme is designed according to the designed coal seam parameters and the coal seam thickness. In view of the large gas pressure, large gas content and large coal seam thickness of the C8 coal seam, a conservative design is adopted, and the coal seams within 12m of the excavation contour line are all treated. Considering that the coal seam is soft and the coal seam permeability is crossed, hydraulic slotting and hydraulic punching are adopted to increase the coal seam gas overflow channel and speed up the drainage effect. The gas is strictly drained according to the design scheme, and the gas drainage effect is detected by technical means during the process to meet the design requirements and specifications.

[0157] Step S207: The coal seam is not outburst, and the gas tunnel is normally excavated.

[0158] Step S208: The outburst prevention effect is tested. The detection index is mainly the gas content per ton of coal, and the drilling cuttings gas analysis index K1 is verified. After the effect is achieved, if the effect is not achieved or the normal part is locally outburst, supplementary outburst prevention measures are taken for continuous treatment until the treatment measures are effective, the test detection index is up to standard, and then S209 is executed.

[0159] Step S209: After the treatment is up to standard, continue to excavate to the C7-1 coal seam 5m normal line.

[0160] Step S210: At the C7-1 coal seam 5m normal line, the outburst danger of each layer of the C7 and C8 coal seam group is verified again. After the effect is achieved, S211 is executed, if the effect is not achieved or the normal part is locally outburst, supplementary outburst prevention measures are taken for continuous treatment until the treatment measures are effective, the test detection index is up to standard, and then S211 is executed.

[0161] Step S211: After the verification treatment is up to standard, continue to excavate to the C7-1 coal seam 2m normal line.

[0162] Step S212: The outburst prevention effect is tested. After the effect is achieved, S213 is executed, if the effect is not achieved or the normal part is locally outburst, supplementary outburst prevention measures are taken for continuous treatment, and after the treatment is completed, S213 is executed for effect verification, until the treatment measures are effective and the test detection index is up to standard after the coal seam is uncovered.

[0163] Step S213: Implement advanced support measures. Small advanced pipes or advanced pipe roof.

[0164] Step S214: Uncover the coal seam or locally uncover the coal seam at the 2m normal line.

[0165] Step S215: after uncovering the coal seam, the gas content in the air of the working face is detected, and the treatment effect verification of the coal and gas outburst is performed after the detection reaches the standard. If the effect is achieved, S216 is executed. If the effect is not achieved or the outburst is local, the outburst prevention measures are supplemented, and the treatment is continued until the treatment measures are effective, the test detection index is reached, and S216 is executed.

[0166] Step S216: the excavation is performed in C7-1, C7-2 and C7-3 coal seams in turn, and the coal seam sampling test is performed every time the excavation is performed, and the outburst treatment effect verification is performed. The construction and verification are performed simultaneously, and the construction and verification are performed simultaneously until the construction and excavation are performed to a distance of 5m from the C8-1 coal seam. Regardless of whether the working face is in the coal seam, part of the working face is in the coal seam or the working face is away from the coal seam, the outburst effect verification of the C8 coal seam must be performed. According to the effect verification, the construction is organized according to the C7 coal seam.

[0167] The technical scheme of the present application first performs advanced geological prediction on the geological body at the target working face to obtain geological data information of the geological body, then performs outburst prevention treatment on the zero-clearance coal seam group at the first working face according to the geological data information, and obtains the gas outburst danger treatment effect, and then obtains the coal uncovering scheme of the zero-clearance coal seam group according to the gas outburst danger treatment effect, and finally performs coal uncovering construction on the zero-clearance coal seam group according to the coal uncovering scheme. In the specific implementation of the present application, the geological data information of the geological body is obtained through advanced geological prediction, and then the zero-clearance coal seam group is treated according to the geological data information, and the gas outburst danger treatment effect is obtained, and then the coal uncovering scheme of the zero-clearance coal seam group is obtained according to the gas outburst danger treatment effect, so that the technical personnel can perform coal uncovering construction on the zero-clearance coal seam group when facing the zero-clearance coal seam group, and the technical defect that the related technology cannot directly use the related technology for safe construction when facing the zero-clearance coal seam group is solved.

[0168] The above is only an optional embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields based on the inventive concept of the present application and the contents of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A method for uncovering a coal seam group with zero net distance in a gas tunnel, characterized in that, The zero net distance coal seam group is formed in a geological body, and the gas tunnel can pass through the zero net distance coal seam group; The method comprises the following steps: Performing advanced geological prediction on the target working face to obtain geological data information of the geological body; wherein the minimum distance between the target working face and the zero net distance coal seam group is a preset target distance; According to the geological data information, obtaining parameter information of each coal seam in the coal seam group; wherein the parameter information comprises a first minimum distance corresponding to each zero net distance coal seam group and a second minimum distance between two adjacent zero net distance coal seam groups; According to the parameter information, filtering out the zero net distance coal seam group from the zero net distance coal seam group according to a preset parameter; wherein the preset parameter comprises a first minimum distance corresponding to each coal seam of a standard zero net distance coal seam group and a second minimum distance between two adjacent coal seams; According to the geological data information, performing at least one outburst prevention treatment on the zero net distance coal seam group at the current working face, and obtaining a gas outburst danger treatment effect; wherein the minimum distance between the current working face and the zero net distance coal seam group is a current distance, and the current distance is smaller than the preset target distance; According to the gas outburst danger treatment effect, obtaining a coal uncovering scheme of the zero net distance coal seam group; According to the coal uncovering scheme, performing coal uncovering construction on the zero net distance coal seam group.

2. The gas tunnel zero net distance coal seam group uncovering method according to claim 1, characterized in that, The working face comprises a first working face, and the current distance between the first working face and the zero net distance coal seam group is a first target distance; Before the step of performing at least one outburst prevention treatment on the zero net distance coal seam group at the current working face according to the geological data information, and obtaining a gas outburst danger treatment effect, the method further comprises: According to the geological data information, excavating and constructing the gas tunnel from the target working face to the first working face; The step of performing at least one outburst prevention treatment on the zero net distance coal seam group at the current working face according to the geological data information, and obtaining a gas outburst danger treatment effect, comprises: According to the geological data information, performing a first outburst prevention treatment on the zero net distance coal seam group at the first working face, and obtaining a gas outburst danger treatment effect.

3. The method for uncovering coal seams of a gas tunnel zero net distance coal seam group according to claim 2, characterized in that, The step of performing a first outburst prevention treatment on the zero net distance coal seam group at the first working face according to the geological data information, and obtaining a gas outburst danger treatment effect, comprises: According to the geological data information, performing a first outburst prevention treatment on the zero net distance coal seam group at the first working face, and obtaining corresponding current treatment data; wherein the current treatment data comprises a ton gas content corresponding to the zero net distance coal seam group corresponding to the first working face after the first outburst prevention treatment and a drilling cuttings gas index K1 value; According to the current treatment data, obtaining a treatment effect corresponding to the zero net distance coal seam group, to obtain the gas outburst danger treatment effect.

4. The method for uncovering coal seams of a gas tunnel zero net distance coal seam group according to claim 3, characterized in that, The step of obtaining a treatment effect corresponding to the zero net distance coal seam group according to the current treatment data, to obtain the gas outburst danger treatment effect, comprises: According to the current governance data, the zero net distance coal seam group is tested, and the corresponding current governance effect is obtained; According to the current governance effect, it is judged whether the corresponding zero net distance coal seam group is outburst; When the zero net distance coal seam group is outburst, the step of performing the first outburst prevention governance on the zero net distance coal seam group at the first working face according to the geological data information and obtaining the corresponding current governance data is returned until all the zero net distance coal seam groups are not outburst, and the gas outburst danger governance effect is obtained.

5. The method for uncovering coal seams of a gas tunnel zero net distance coal seam group according to claim 4, characterized in that, The working face further includes a second working face, and the current distance between the second working face and the zero net distance coal seam group is a second target distance, which is less than the first target distance; After the step of judging whether the corresponding zero net distance coal seam group is outburst according to the current governance effect, the following steps are further included: When the zero net distance coal seam group is not outburst, the first working face is excavated to the second working face; According to the geological data information, the outburst danger of the zero net distance coal seam group at the second working face is detected, and the corresponding first governance data is obtained; wherein the first governance data includes the ton gas content and the drill cuttings gas index K1 value of the zero net distance coal seam group obtained at the second working face; According to the first governance data, the zero net distance coal seam group is tested, and the corresponding first governance effect is obtained; According to the first governance effect, the outburst result of the corresponding zero net distance coal seam group is obtained.

6. The method for uncovering coal seams of a gas tunnel zero net distance coal seam group according to claim 5, characterized in that, The step of obtaining the outburst result of the corresponding zero net distance coal seam group according to the first governance effect includes: According to the first governance effect, it is judged whether the corresponding zero net distance coal seam group is outburst; When the zero net distance coal seam group is outburst, the second outburst prevention governance is performed on the zero net distance coal seam group at the second working face, and the corresponding second governance data is obtained; wherein the second governance data includes the ton gas content and the drill cuttings gas index K1 value of the second working face after the second governance; According to the second governance data, the zero net distance coal seam group is tested, and the corresponding second governance effect is obtained; According to the second governance effect, it is judged whether the corresponding zero net distance coal seam group is outburst; When the zero net distance coal seam group is outburst, the step of performing the outburst prevention governance on the zero net distance coal seam group at the second working face and obtaining the second governance data is returned until all the zero net distance coal seam groups are not outburst; When the zero net distance coal seam group is not outburst, the outburst result of the corresponding zero net distance coal seam group is obtained.

7. The method for uncovering coal seams of a gas tunnel zero net distance coal seam group according to claim 5, characterized in that, The step of excavating the first working face to the second working face when the zero net distance coal seam group is not outburst includes: When the zero net distance coal seam group is not outburst, the geological body within the first target distance is divided into at least two cycle footage segments according to the excavation direction of the tunnel; A cycle footage segment is excavated at the first working face to form a first construction face; The first construction face is used to test the zero-clearance coal seam group, and it is determined whether the corresponding zero-clearance coal seam group is outburst; When the zero-clearance coal seam group is outburst, the third outburst prevention treatment is performed on the zero-clearance coal seam group at the first construction face, and the step of testing the zero-clearance coal seam group at the first construction face and determining whether the corresponding zero-clearance coal seam group is outburst is returned to be executed until the zero-clearance coal seam group is not outburst; When the zero-clearance coal seam group is not outburst, the first construction face is used as the first working face, and the step of excavating a cycle footage section at the first working face to form the first construction face is returned to be executed until all the cycle footage sections are excavated to form the second working face.

8. The method for uncovering coal seams of a gas tunnel zero-net-to- distance coal seam group according to any one of claims 5 to 7, characterized in that, The step of performing the coal uncovering construction on the zero-clearance coal seam group according to the coal uncovering scheme includes: According to the coal uncovering scheme, the zero-clearance coal seam group is subjected to advanced support at the second working face; The zero-clearance coal seam group is treated as a single coal seam, and the coal uncovering construction is completed.

9. The method for uncovering coal seams of a gas tunnel zero net distance coal seam group according to claim 8, characterized in that, The step of treating the zero-clearance coal seam group as a single coal seam and completing the coal uncovering construction includes: The zero-clearance coal seam group is treated as a single coal seam, and the single coal seam is subjected to the coal uncovering construction until a third working face is formed after a third target distance of the single coal seam is passed through; The third working face is used to test the geological body, and the current parameters of the geological body are obtained; wherein the current parameters include the ton gas content and the drill cuttings gas index K1 value of the geological body corresponding to the third working face; It is determined whether the current parameters meet the preset index; When the current parameters do not meet the preset index, the fourth outburst prevention treatment is performed on the geological body at the third working face, and the step of testing the geological body at the third working face and obtaining the current parameters of the geological body is returned to be executed until the current parameters meet the preset index; When the current parameters meet the preset index, the excavation construction is continued at the third working face.

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