WO2016107435A1 - Method operating outside of passageway for optimizing passageway regional stress field - Google Patents
Method operating outside of passageway for optimizing passageway regional stress field Download PDFInfo
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- WO2016107435A1 WO2016107435A1 PCT/CN2015/098034 CN2015098034W WO2016107435A1 WO 2016107435 A1 WO2016107435 A1 WO 2016107435A1 CN 2015098034 W CN2015098034 W CN 2015098034W WO 2016107435 A1 WO2016107435 A1 WO 2016107435A1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- the invention relates to a method for optimizing the stress field of a roadway outside the roadway, and is particularly suitable for optimizing the regional stress field of the roadway before the deep well and high ground stress roadway excavation, and belongs to the technical field of roadway support.
- the deformation of the roadway is an inevitable phenomenon in the production of coal mines. Due to the differences in specific conditions, the deformation of the roadway will result in different deformation phenomena such as roof subsidence, two-way approaching and bottom drum, so that the roadway section cannot meet the ventilation, transportation and pedestrians. Demand for production activities such as transportation. Especially after coal mining has entered deep mining, the roadway has turned into a high-stress roadway.
- the deep well high-stress roadway shows the characteristics of large pressure, large deformation and fast deformation speed, especially the large horizontal stress and the large deformation of the bottom drum.
- the roadway needs frequent renovation to meet the normal production needs. Practice has shown that the rate of roadway renovation in deep mining can reach 40%-80%, and some even up to 100%.
- the purpose of the present invention is to provide a method for drilling and blasting outside the roadway for some deep wells and high ground stress roadways that do not have the conditions for the pressure relief scheme in the roadway, and must be relieved before the tunneling. Optimize the stress field method in the roadway area.
- the method for optimizing the stress field of a roadway region outside the roadway of the present invention comprises the following steps:
- the horizontal distance a of the pressure relief lane and the pre-excavation roadway is 0-30 m, and the vertical distance b is 5-40 m.
- the vertical distance e between the stress relieving borehole and the pre-drilling tunnel is 2 to 3 times the span of the pre-digging tunnel.
- the multi-row stress optimization drilling has a spacing f of 0.6-2 m adjacent to the two rows, and the row g of the adjacent two rows is 0.6-1.2 m, the length of the stress optimized drilling l, the stress optimized drilling and the vertical direction
- the angle ⁇ is determined by the horizontal distance a, the vertical distance b, and the relative distance c.
- the charging length d of the charging zone is 1 to 3 m.
- the invention removes the ground stress in the roadway connected with the pre-excavation roadway by stress, and obtains the main stress magnitude and direction in the surrounding rock of the area where the pre-drilling roadway is located, and calculates and analyzes the roadway after the excavation roadway The position of the largest principal stress difference formed in the gang.
- a pressure relief roadway parallel to the pre-digging roadway is pre-excavated.
- the support strength of the pressure relief roadway allows large deformation of the roadway even after the completion of the borehole pressure relief. Destruction, a certain pressure relief effect on the pre-drilling roadway.
- Multi-column stress-optimized drilling is carried out from the pressure relief lane of the bottom plate to the position of the maximum principal stress difference between the left and right gangs of the pre-drilling roadway, and the drilling is performed by charging and static blasting.
- the stress-optimized drilling can be divided into a group by multiple rows, and the pressure is decompressed by means of group sequential blasting.
- the drilling, charging and blasting pressure relief are carried out, and the stress field of the roadway in the full length of the pre-excavation roadway is optimized ahead of time.
- the method is simple, the operation is convenient, and the implementation effect is good.
- the main advantages are:
- the excavation of the pressure relief roadway not only solves the problem of difficult construction of the pressure relief scheme in the roadway, but also the deformation of the pressure relief roadway also acts as a pressure relief for the pre-drilling roadway;
- the blasting pressure relief is carried out on the position of the maximum principal stress difference, and the blasting pressure relief is objective and targeted;
- the method of static blasting is used to carry out blasting and pressure relief, which will not cause damage to the surrounding rock of the shallow roadway.
- FIG. 1 is a schematic view showing a method for optimizing a stress field of a roadway region outside the roadway according to the present invention
- FIG. 2 is a schematic view showing the stress relief drilling in the method for optimizing the stress field of the roadway in the roadway construction according to the present invention
- FIG. 3 is a schematic view showing the arrangement of the top plate stress optimized drilling in the method for optimizing the stress field of the roadway in the roadway construction of the present invention.
- Excavation pressure relief roadway In the floor level of the pre-drilling roadway 1, pre-drill a pressure relief lane 2 and support it; the strength of the support allows the pressure relief lane 2 to complete the stress optimization drilling arrangement and after blasting Large deformation and damage occur, and the pre-excavation into the roadway acts as a pressure relief.
- the horizontal distance a of the pressure relief lane 2 and the pre-excavation roadway 1 is 0-30 m, and the vertical distance b is 5-40 m, as shown in FIG.
- the hole position of the multi-column stress optimization drilling 4 is arranged from the top plate of the pressure relief roadway 2 to the maximum main stress difference position 3 of the pre-excavation roadway; the final hole position falls at the position of the maximum principal stress difference 3; stress optimization of the length of the borehole l, stress optimization of the angle between the borehole 4 and the vertical direction ⁇ is determined by the horizontal distance a, the vertical distance b, the relative distance c; the multi-column stress optimization drilling 4 phase
- the pitch f of the adjacent two rows is 0.6 to 2 m
- the row g of the adjacent two rows is 0.6 to 1.2 m
- the diameter D of the drilled hole is 40 mm or more.
Abstract
Disclosed is a method operating outside of a passageway for optimizing the passageway regional stress field, said method relating to the technical field of passageway protection. First, boring a pressure-relieving passageway (2) at an appropriate location in the floor rock layer of a passageway to be bored (1); measuring, inside of a passageway (6) in communication with the passageway to be bored (1), the crustal stress; calculating and analyzing the principal stress to obtain the position of the greatest difference of principal stress (3) on the wall after the passageway is bored; constructing from the inside of the pressure-relieving passageway (2) multiple rows of stress optimization holes (4) toward the position of the greatest difference of principal stress (3); performing static blasting at the position of the greatest difference of principal stress (3), thereby optimizing the passageway regional stress field. The present method relieves the pressure for passageways that have high stress but do not meet the requirements for pressure relief from inside of the passageways, and optimizes the passageway regional stress field. The method is simple and easy to operate, and has good implementation results and a prospect for wide application.
Description
本发明涉及一种巷外施工优化巷道区域应力场的方法，尤其适用于深井、高地应力巷道掘进前对巷道进行区域应力场优化，属于巷道支护技术领域。The invention relates to a method for optimizing the stress field of a roadway outside the roadway, and is particularly suitable for optimizing the regional stress field of the roadway before the deep well and high ground stress roadway excavation, and belongs to the technical field of roadway support.
巷道的变形是煤矿生产中的必然现象，巷道因具体赋存条件的差异，会产生顶板下沉、两帮移近和底鼓等不同的变形现象，使得巷道断面不能满足通风、运输、行人、运料等生产活动的需求。尤其是煤矿开采进入深部开采以后，巷道转变为高应力巷道。深井高应力巷道表现出压力大、变形量大及变形速度快等特点，尤其是水平应力大、底鼓变形量大，巷道需要经常的翻修才能满足正常的生产需要。实践表明，深部开采的巷道翻修率可达40％-80％，有的甚至高达100％。深井、高应力巷道的有效支护问题给煤矿的正常生产带来巨大的困扰。针对以上的问题，国内外学者和煤矿工程技术人员提出了许多的卸压理论和方法，并进行了多次实践，包括支架加固、钻孔卸压、切槽等等。但是这些方法多是基于巷道内施工，滞后或平行于巷道掘进，与巷道掘进相矛盾，提高了工人的劳动强度，增加了施工工序，仅在已掘进的巷道和掘进工作面前方几米的范围内可以实施，且效果局限，深井巷道变形仍然严重。当深井巷道的赋存条件不允许巷道内施工卸压方案，但是在掘进前就必须进行卸压时，上述方法即不具有可行性，所以对于该类巷道不能采用现有的方法进行卸压，亟需提出一种巷外施工、有效可行的卸压方法。The deformation of the roadway is an inevitable phenomenon in the production of coal mines. Due to the differences in specific conditions, the deformation of the roadway will result in different deformation phenomena such as roof subsidence, two-way approaching and bottom drum, so that the roadway section cannot meet the ventilation, transportation and pedestrians. Demand for production activities such as transportation. Especially after coal mining has entered deep mining, the roadway has turned into a high-stress roadway. The deep well high-stress roadway shows the characteristics of large pressure, large deformation and fast deformation speed, especially the large horizontal stress and the large deformation of the bottom drum. The roadway needs frequent renovation to meet the normal production needs. Practice has shown that the rate of roadway renovation in deep mining can reach 40%-80%, and some even up to 100%. The effective support of deep wells and high-stress roadways has caused great problems for the normal production of coal mines. In response to the above problems, domestic and foreign scholars and coal mine engineering technicians have proposed a number of pressure relief theories and methods, and have carried out many practices, including bracket reinforcement, drilling pressure relief, grooving and so on. However, these methods are mostly based on construction in the roadway, lagging behind or parallel to the roadway, contradicting the roadway excavation, improving the labor intensity of the workers and increasing the construction process, only within a few meters in front of the excavated roadway and the heading face. It can be implemented, and the effect is limited. The deformation of the deep well roadway is still serious. When the conditions of the deep well roadway do not allow the construction of the pressure relief scheme in the roadway, but the pressure relief must be carried out before the excavation, the above method is not feasible, so the existing method cannot be used for the pressure relief of the roadway. It is urgent to propose an effective and feasible pressure relief method for construction outside the lane.
发明内容Summary of the invention
技术问题：本发明的目的是针对部分深井、高地应力巷道不具备本巷道内施工卸压方案的条件、而又必须在掘进前进行卸压的问题，提供一种在巷外施工的钻孔爆破优化巷道区域应力场方法。Technical Problem: The purpose of the present invention is to provide a method for drilling and blasting outside the roadway for some deep wells and high ground stress roadways that do not have the conditions for the pressure relief scheme in the roadway, and must be relieved before the tunneling. Optimize the stress field method in the roadway area.
技术方案：本发明的巷外施工优化巷道区域应力场的方法，包括如下步骤：Technical Solution: The method for optimizing the stress field of a roadway region outside the roadway of the present invention comprises the following steps:
(1)在与预掘进巷道相连通的巷道内，施工应力解除钻孔，利用应力解除法实测地应力，得到主应力的大小和方向分布，计算并确定预掘进巷道掘巷以后，预掘巷道两帮最大主应力差位置与预掘巷帮的相对距离c；(1) In the roadway connected with the pre-excavation roadway, the construction stress is relieved, the earth stress is measured by the stress relieving method, and the magnitude and direction distribution of the principal stress are obtained. After the pre-drilling roadway is dug, the roadway is pre-digging. The relative distance between the position of the maximum principal stress difference of the two gangs and the pre-excavation gangway c;
(2)在预掘进巷道的底板层位中，预先掘进一卸压巷，并进行支护；(2) Pre-drilling a pressure relief lane and supporting it in the floor level of the pre-drilling roadway;
(3)从卸压巷顶板向预掘巷道两帮最大主应力差位置分别布置多列应力优化钻孔的孔位；
(3) Arranging the multi-row stress-optimized drilling hole positions from the top of the pressure relief roadway to the maximum principal stress difference position of the two gangs of the pre-digging roadway;
(4)按排逐一施工应力优化钻孔，并在每个应力优化钻孔的孔底装药区装药；(4) Optimize the borehole according to the construction stress, and charge the charge in the bottom charge area of each stress optimized borehole;
(5)对应力优化钻孔进行静力爆破，优化巷道区域应力场。(5) Perform static blasting on the stress-optimized drilling to optimize the stress field in the roadway.
所述的卸压巷与预掘进巷道的水平距离a为0～30m，垂直距离b为5～40m。The horizontal distance a of the pressure relief lane and the pre-excavation roadway is 0-30 m, and the vertical distance b is 5-40 m.
所述的应力解除钻孔与预掘进巷道的垂直距离e为2～3倍的预掘进巷道跨度范围。The vertical distance e between the stress relieving borehole and the pre-drilling tunnel is 2 to 3 times the span of the pre-digging tunnel.
所述的多列应力优化钻孔相邻两列的间距f为0.6～2m，相邻两排的排距g为0.6～1.2m，应力优化钻孔的长度l、应力优化钻孔与竖直方向的夹角α通过水平距离a、垂直距离b、相对距离c确定。The multi-row stress optimization drilling has a spacing f of 0.6-2 m adjacent to the two rows, and the row g of the adjacent two rows is 0.6-1.2 m, the length of the stress optimized drilling l, the stress optimized drilling and the vertical direction The angle α is determined by the horizontal distance a, the vertical distance b, and the relative distance c.
所述的装药区的装药长度d为1～3m。The charging length d of the charging zone is 1 to 3 m.
有益效果：本发明在与预掘进巷道相连通的巷道内通过应力解除法侧地应力，得到预掘进巷道所处区域的围岩中主应力大小及方向，计算和分析得到出掘巷后巷道两帮中形成的最大主应力差位置。在预掘进巷道层位的下方合适的层位中，预先掘进一条与预掘进巷道平行的卸压巷，该卸压巷道的支护强度允许巷道发生大的变形甚至在钻孔卸压完成以后完全破坏，对预掘进巷道起到一定的卸压效果。从底板的卸压巷内分别向预掘进巷道的左右两帮最大主应力差位置处施工多列应力优化钻孔，对钻孔进行装药和静力爆破卸压。装药后可对应力优化钻孔采用多排分为一组，以组为单位顺序爆破的方式进行卸压。上一组应力优化钻孔爆破施工完成以后，循环进行钻孔、装药、爆破卸压，完成对预掘进巷道全长的巷道区域应力场超前优化，其方法简单，操作方便，实施效果好。主要优点有：The beneficial effect: the invention removes the ground stress in the roadway connected with the pre-excavation roadway by stress, and obtains the main stress magnitude and direction in the surrounding rock of the area where the pre-drilling roadway is located, and calculates and analyzes the roadway after the excavation roadway The position of the largest principal stress difference formed in the gang. In the appropriate slab below the pre-drilling roadway level, a pressure relief roadway parallel to the pre-digging roadway is pre-excavated. The support strength of the pressure relief roadway allows large deformation of the roadway even after the completion of the borehole pressure relief. Destruction, a certain pressure relief effect on the pre-drilling roadway. Multi-column stress-optimized drilling is carried out from the pressure relief lane of the bottom plate to the position of the maximum principal stress difference between the left and right gangs of the pre-drilling roadway, and the drilling is performed by charging and static blasting. After the charging, the stress-optimized drilling can be divided into a group by multiple rows, and the pressure is decompressed by means of group sequential blasting. After the completion of the last set of stress-optimized drilling and blasting, the drilling, charging and blasting pressure relief are carried out, and the stress field of the roadway in the full length of the pre-excavation roadway is optimized ahead of time. The method is simple, the operation is convenient, and the implementation effect is good. The main advantages are:
1.卸压巷的掘进不仅解决了巷内卸压方案施工困难的问题，而且卸压巷的变形对预掘进巷道也起到了卸压的作用；1. The excavation of the pressure relief roadway not only solves the problem of difficult construction of the pressure relief scheme in the roadway, but also the deformation of the pressure relief roadway also acts as a pressure relief for the pre-drilling roadway;
2.多列钻孔的施工对预掘进巷道起到了一定的卸压效果；2. The construction of multiple rows of boreholes has a certain pressure relief effect on the pre-drilling roadway;
3.对最大主应力差位置进行了爆破卸压，爆破卸压有目地性和针对性；3. The blasting pressure relief is carried out on the position of the maximum principal stress difference, and the blasting pressure relief is objective and targeted;
4.爆破时采用分组顺序爆破的方式进行卸压，卸压效果较好；4. When blasting, the method of group sequential blasting is used to relieve pressure, and the pressure relief effect is better;
5.采用静力爆破的方式进行爆破卸压，不会对浅部的巷道围岩造成破坏。5. The method of static blasting is used to carry out blasting and pressure relief, which will not cause damage to the surrounding rock of the shallow roadway.
图1为本发明的巷外施工优化巷道区域应力场的方法示意图；1 is a schematic view showing a method for optimizing a stress field of a roadway region outside the roadway according to the present invention;
图2为本发明的巷外施工优化巷道区域应力场的方法中应力解除钻孔示意图；2 is a schematic view showing the stress relief drilling in the method for optimizing the stress field of the roadway in the roadway construction according to the present invention;
图3为本发明的巷外施工优化巷道区域应力场的方法中顶板应力优化钻孔的布置示意图。FIG. 3 is a schematic view showing the arrangement of the top plate stress optimized drilling in the method for optimizing the stress field of the roadway in the roadway construction of the present invention.
图中：1-预掘进巷道；2-卸压巷；3-最大主应力差位置；4-应力优化钻孔；5-装药区；6-巷道；7-应力解除钻孔。
In the figure: 1- pre-excavation roadway; 2-pressure relief lane; 3-maximum principal stress difference position; 4-stress optimized drilling; 5-charge area; 6-lane road; 7-stress relief drilling.
下面结合附图对本发明的一个实施例作进一步的描述：An embodiment of the present invention will be further described below with reference to the accompanying drawings:
本发明的巷外施工优化巷道区域应力场的方法，具体步骤如下：The method for optimizing the stress field of the roadway region outside the lane of the invention, the specific steps are as follows:
(1)地应力的测试，得到最大主应力差位置：在与预掘进巷道1相连通的巷道6内，施工应力解除钻孔7，如图2所示，利用应力解除法实测地应力，得到主应力的大小和方向分布，计算并确定预掘进巷道1掘巷以后，预掘巷道两帮最大主应力差位置3与预掘巷帮的相对距离c；所述的应力解除钻孔7与预掘进巷道1的垂直距离e为2～3倍的预掘进巷道跨度范围。(1) Test of ground stress, the position of the maximum principal stress difference is obtained: in the roadway 6 communicating with the pre-drilling roadway 1, the construction stress is removed from the borehole 7, as shown in Fig. 2, the ground stress is measured by the stress relieving method, and The magnitude and direction distribution of the principal stress, calculate and determine the relative distance c between the maximum principal stress difference position 3 of the pre-excavation roadway and the pre-excavation roadway after the roadway is excavated in the roadway; the stress relief hole 7 and the pre-excavation The vertical distance e of the roadway 1 is 2 to 3 times the span of the pre-digging roadway.
(2)掘进卸压巷：在预掘进巷道1的底板层位中，预先掘进一卸压巷2，并进行支护；支护的强度允许卸压巷2完成应力优化钻孔布置、爆破后发生大的变形和破坏，对预掘进巷道起到卸压作用。所述的卸压巷2与预掘进巷道1的水平距离a为0～30m，垂直距离b为5～40m，如图1所示。(2) Excavation pressure relief roadway: In the floor level of the pre-drilling roadway 1, pre-drill a pressure relief lane 2 and support it; the strength of the support allows the pressure relief lane 2 to complete the stress optimization drilling arrangement and after blasting Large deformation and damage occur, and the pre-excavation into the roadway acts as a pressure relief. The horizontal distance a of the pressure relief lane 2 and the pre-excavation roadway 1 is 0-30 m, and the vertical distance b is 5-40 m, as shown in FIG.
(3)布置应力优化钻孔：从卸压巷2顶板向预掘巷道两帮最大主应力差位置3分别布置多列应力优化钻孔4的孔位；终孔位置落在最大主应力差位置3处；应力优化钻孔4的长度l、应力优化钻孔4与竖直方向的夹角α通过水平距离a、垂直距离b、相对距离c确定；所述的多列应力优化钻孔4相邻两列的间距f为0.6～2m，相邻两排的排距g为0.6～1.2m，钻孔的直径D为40mm以上。(3) Layout stress optimization drilling: the hole position of the multi-column stress optimization drilling 4 is arranged from the top plate of the pressure relief roadway 2 to the maximum main stress difference position 3 of the pre-excavation roadway; the final hole position falls at the position of the maximum principal stress difference 3; stress optimization of the length of the borehole l, stress optimization of the angle between the borehole 4 and the vertical direction α is determined by the horizontal distance a, the vertical distance b, the relative distance c; the multi-column stress optimization drilling 4 phase The pitch f of the adjacent two rows is 0.6 to 2 m, the row g of the adjacent two rows is 0.6 to 1.2 m, and the diameter D of the drilled hole is 40 mm or more.
(4)按排逐一施工应力优化钻孔4，并在每个应力优化钻孔4的孔底装药，孔底装药区5的装药长度d为1～3m。(4) Optimize the borehole 4 according to the construction stress, and charge the bottom of each hole of the borehole 4, and the charge length d of the bottom charge area 5 is 1 to 3 m.
(5)对应力优化钻孔4进行静力爆破，优化巷道区域应力场。爆破时可采用多排分组，以组为单位顺序爆破的方式进行爆破卸压，以图3为例，每五排钻孔分为一个组，编号为1#～5#；首先对3#排钻孔进行爆破，间隔一段时间后，再对2#、4#排钻孔同时静力爆破，再相隔一段时间后，再对1#、5#排钻孔同时进行静力爆破。(5) Perform static blasting on the stress-optimized drilling 4 to optimize the stress field in the roadway area. When blasting, multiple rows of groups can be used, and blasting and pressure relief can be carried out in the order of group blasting. Take Figure 3 as an example. Each five rows of drill holes are divided into one group, numbered 1#~5#; firstly, 3# row Drilling is carried out for blasting. After a period of time, the 2# and 4# row holes are drilled at the same time and statically blasted. After a period of time, the 1# and 5# row holes are drilled simultaneously for static blasting.
(6)：重复步骤(3)、(4)、(5)：上一区段钻孔爆破完以后，重复进行钻孔、装药、爆破，直到巷道全场区域内完成巷道区域应力场优化目标为止。
(6): Repeat steps (3), (4), (5): after drilling and blasting in the previous section, repeat drilling, charging, and blasting until the stress field optimization of the roadway area is completed in the whole field of the roadway. Until the goal.
Claims (5)
- 一种巷外施工优化巷道区域应力场的方法，其特在于包括如下步骤：A method for optimizing the stress field of a roadway area outside the roadway, which comprises the following steps:(1)在与预掘进巷道(1)相连通的巷道(6)内，施工应力解除钻孔(7)，利用应力解除法实测地应力，得到主应力的大小和方向分布，计算并确定预掘进巷道(1)掘巷以后，预掘巷道两帮最大主应力差位置(3)与预掘巷帮的相对距离c；(1) In the roadway (6) that communicates with the pre-drilling roadway (1), the construction stress is removed from the borehole (7), and the earth stress is measured by the stress relieving method to obtain the magnitude and direction distribution of the principal stress, and the pre-calculation is calculated and determined. Driving roadway (1) After the roadway is excavated, the relative distance between the two main slabs of the pre-excavation roadway (3) and the pre-excavation gangway c;(2)在预掘进巷道(1)的底板层位中，预先掘进一卸压巷(2)，并进行支护；(2) Pre-digging a pressure relief lane (2) in the floor level of the pre-drilling roadway (1) and supporting it;(3)从卸压巷(2)顶板向预掘巷道两帮最大主应力差位置(3)分别布置多列应力优化钻孔(4)的孔位；(3) Arranging the hole positions of the multi-row stress optimization drilling (4) from the top plate of the pressure relief roadway (2) to the position of the maximum principal stress difference of the two gangs of the pre-digging roadway (3);(4)按排逐一施工应力优化钻孔(4)，并在每个应力优化钻孔(4)的孔底装药区(5)装药；(4) Optimize the drilling hole (4) according to the construction stress, and charge the bottom hole charging area (5) in each stress optimization drilling hole (4);(5)对应力优化钻孔(4)进行静力爆破，优化巷道区域应力场。(5) Perform static blasting on the stress-optimized drilling (4) to optimize the stress field in the roadway area.
- 根据权利要求1所述的巷外施工优化巷道区域应力场的方法，其特征在于：所述的卸压巷(2)与预掘进巷道(1)的水平距离a为0～30m，垂直距离b为5～40m。The method for optimizing the stress field of a roadway region according to claim 1, wherein the horizontal distance a of the pressure relief lane (2) and the pre-excavation roadway (1) is 0-30 m, and the vertical distance b It is 5 to 40 m.
- 根据权利要求1所述的巷外施工优化巷道区域应力场的方法，其特征在于：所述的应力解除钻孔(7)与预掘进巷道(1)的垂直距离e为2～3倍的预掘进巷道跨度范围。The method for optimizing the stress field of a roadway region according to claim 1, characterized in that: the vertical distance e between the stress relief hole (7) and the pre-drilling roadway (1) is 2 to 3 times Dig into the span of the roadway.
- 根据权利要求1所述的巷外施工优化巷道区域应力场的方法，其特征在于：所述的多列应力优化钻孔(4)相邻两列的间距f为0.6～2m，相邻两排的排距g为0.6～1.2m，应力优化钻孔(4)的长度l、应力优化钻孔(4)与竖直方向的夹角α通过水平距离a、垂直距离b、相对距离c确定。The method for optimizing the stress field of a roadway region according to claim 1, wherein the multi-row stress optimization drilling hole (4) has a spacing f of 0.6 to 2 m adjacent to the two rows, and two adjacent rows The row spacing g is 0.6-1.2 m, the length of the stress-optimized drilling hole (4), the angle between the stress-optimized drilling hole (4) and the vertical direction α is determined by the horizontal distance a, the vertical distance b, and the relative distance c.
- 根据权利要求1所述的巷外施工优化巷道区域应力场的方法，其特征在于：所述的装药区(5)的装药长度d为1～3m。 The method for optimizing the stress field of a roadway region according to claim 1, characterized in that the charging length d of the charging region (5) is 1 to 3 m.
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| CN115263318A (en) * | 2022-06-29 | 2022-11-01 | 中国矿业大学 | Combined pressure relief method for head-on blasting and cracking of rock burst mine excavation roadway |
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| CN104500078B (en) * | 2014-12-29 | 2016-08-17 | 中国矿业大学 | A kind of method of construction optimization tunnel regional stress field outside lane |
| CN111578797B (en) * | 2020-07-06 | 2022-05-31 | 酒泉钢铁(集团)有限责任公司 | Underground medium-length hole blasting suspended roof processing method |
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