袁店二矿7232工作面梯形巷道帮部破坏特征研究
发布时间：2018-09-19 14:33
【摘要】：本文围绕“袁店二矿7232工作面梯形巷道低帮破坏特征”,以袁店二矿400m埋深的7232工作面巷道为研究对象,针对低帮侧中上部出现明显的鼓出,且不少区域鼓出部位的锚杆从托盘处断裂的现象,在广泛收集资料及长期现场跟踪的基础上,运用理论分析、数值模拟、现场工业性试验等综合研究手段,展开如下研究:(1)井巷围岩弹性应力分布规律研究:从轴对称圆巷围岩弹性应力状态理论推导入手,逐步过渡到一般圆巷围岩弹性应力状态,最后到非圆巷围岩弹性应力状态,以此为依据建立不同的力学模型分析倾角对弹性应力状态的影响。(2)不同顶板倾角对梯形巷道帮部应力分布的影响研究:运用FLAC3D5.0数值模拟软件模拟不同顶板倾角对巷道帮部应力分布的影响。根据顶板倾角的改变,建立三种倾角(0°,17°,30°)条件下的巷道模型。通过分析不同倾角巷道的围岩应力分布、位移量变化以及塑性区等规律,得出帮部围岩应力随顶板倾角的变化而变化的规律,进而得出顶板倾角对梯形巷道应力分布的影响规律,为各矿区不同顶板倾角支护提供一定的理论基础。(3)不同支护方案对巷道帮部围岩控制效果的研究:根据实际情况,结合以上模拟得出的顶板倾角对巷道帮部应力分布影响规律,利用数值模拟软件模拟出不同支护方式下的巷道帮部围岩控制效果。分别从增加锚杆长度、增加锚杆根数和改变锚杆间距三种形式进行模拟,全面分析并验证不同方式对巷道围岩控制的效果差异。在满足安全生产要求的前提下,选择合理的支护方式,避免盲目地对巷道进行加固修整而浪费人力和财力。(4)工业性试验及现场实测研究:在上述研究的基础上,针对袁店二矿7232工作面梯形巷道低帮中上部鼓出的案例,结合实际资金和工人劳动量等因素,对巷道低帮采用以上提出的方案进行验证。工业性试验矿压监测表明7232工作面梯形巷道低帮的工业性试验是成功的,不等强支护在不影响安全和不增加资金负担的情况下有效地遏制了巷道帮部中上部变形,证明了不等强支护是治理梯形巷道低帮中上部鼓出的有效控制手段,为此类巷道群的有效控制提供了参考和指导。
[Abstract]:This paper focuses on the "characteristics of low slope failure of trapezoidal roadway in No. 7232 face of Yuandian No.2 Mine", taking the 7232 face roadway with 400m buried depth in Yuandian No. 2 Mine as the research object, aiming at the obvious bulging out of the middle and upper part of the low side. On the basis of extensive data collection and long-term field tracking, comprehensive research means such as theoretical analysis, numerical simulation, field industrial test and so on are used. The following studies are carried out: (1) the distribution of elastic stress in surrounding rock of shaft and roadway: starting with the theoretical derivation of elastic stress state of surrounding rock in axisymmetric circular roadway, the elastic stress state of surrounding rock in general circular roadway is gradually transferred to the elastic stress state of surrounding rock in non-circular roadway. Based on this, different mechanical models were established to analyze the effect of dip angle on elastic stress state. (2) the influence of different roof dip angle on stress distribution of trapezoidal roadway was studied: FLAC3D5.0 numerical simulation software was used to simulate different roof dip angle. The influence of stress distribution on the side of roadway. According to the change of roof inclination angle, the roadway models under three kinds of inclination angles (0 掳~ 17 掳~ 30 掳) are established. By analyzing the stress distribution of surrounding rock, displacement change and plastic zone of roadway with different inclination angles, the variation of surrounding rock stress with the change of roof inclination angle is obtained. The influence of roof inclination angle on the stress distribution of trapezoidal roadway is obtained, which provides a certain theoretical basis for different roof inclination support in mining areas. (3) study on the control effect of different supporting schemes on surrounding rock of roadway roof: according to the actual situation, Combined with the influence of roof inclination angle on the stress distribution of roadway slope, numerical simulation software is used to simulate the control effect of roadway roof surrounding rock under different supporting modes. In order to analyze and verify the effects of different ways on controlling the surrounding rock of roadway, the simulation is carried out by increasing the length of anchor rod, increasing the number of bolt roots and changing the spacing of anchor rod respectively. On the premise of meeting the requirement of safe production, reasonable supporting method is chosen to avoid wasting manpower and financial resources by blindly strengthening and repairing roadway. (4) Industrial test and field measurement research: on the basis of the above research, In view of the case of the middle and upper bottom of trapezoidal roadway in No. 7232 working face of Yuan Dian No. 2 Coal Mine, combined with the factors of actual capital and labor quantity of workers, this paper verifies the scheme of the low slope of roadway adopted above. The industrial test shows that the low slope of trapezoidal roadway in 7232 face is successful in industrial test. The unequal support can effectively restrain the deformation of the upper and middle part of roadway without affecting safety and increasing the burden of funds. It is proved that unequal strength support is an effective control method for controlling the middle and upper top of trapezoidal roadway, which provides a reference and guidance for the effective control of this kind of roadway group.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353
[Abstract]:This paper focuses on the "characteristics of low slope failure of trapezoidal roadway in No. 7232 face of Yuandian No.2 Mine", taking the 7232 face roadway with 400m buried depth in Yuandian No. 2 Mine as the research object, aiming at the obvious bulging out of the middle and upper part of the low side. On the basis of extensive data collection and long-term field tracking, comprehensive research means such as theoretical analysis, numerical simulation, field industrial test and so on are used. The following studies are carried out: (1) the distribution of elastic stress in surrounding rock of shaft and roadway: starting with the theoretical derivation of elastic stress state of surrounding rock in axisymmetric circular roadway, the elastic stress state of surrounding rock in general circular roadway is gradually transferred to the elastic stress state of surrounding rock in non-circular roadway. Based on this, different mechanical models were established to analyze the effect of dip angle on elastic stress state. (2) the influence of different roof dip angle on stress distribution of trapezoidal roadway was studied: FLAC3D5.0 numerical simulation software was used to simulate different roof dip angle. The influence of stress distribution on the side of roadway. According to the change of roof inclination angle, the roadway models under three kinds of inclination angles (0 掳~ 17 掳~ 30 掳) are established. By analyzing the stress distribution of surrounding rock, displacement change and plastic zone of roadway with different inclination angles, the variation of surrounding rock stress with the change of roof inclination angle is obtained. The influence of roof inclination angle on the stress distribution of trapezoidal roadway is obtained, which provides a certain theoretical basis for different roof inclination support in mining areas. (3) study on the control effect of different supporting schemes on surrounding rock of roadway roof: according to the actual situation, Combined with the influence of roof inclination angle on the stress distribution of roadway slope, numerical simulation software is used to simulate the control effect of roadway roof surrounding rock under different supporting modes. In order to analyze and verify the effects of different ways on controlling the surrounding rock of roadway, the simulation is carried out by increasing the length of anchor rod, increasing the number of bolt roots and changing the spacing of anchor rod respectively. On the premise of meeting the requirement of safe production, reasonable supporting method is chosen to avoid wasting manpower and financial resources by blindly strengthening and repairing roadway. (4) Industrial test and field measurement research: on the basis of the above research, In view of the case of the middle and upper bottom of trapezoidal roadway in No. 7232 working face of Yuan Dian No. 2 Coal Mine, combined with the factors of actual capital and labor quantity of workers, this paper verifies the scheme of the low slope of roadway adopted above. The industrial test shows that the low slope of trapezoidal roadway in 7232 face is successful in industrial test. The unequal support can effectively restrain the deformation of the upper and middle part of roadway without affecting safety and increasing the burden of funds. It is proved that unequal strength support is an effective control method for controlling the middle and upper top of trapezoidal roadway, which provides a reference and guidance for the effective control of this kind of roadway group.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353
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