底板采动破坏深度微震实时获取与动态预测及应用研究
发布时间：2018-08-19 09:46
【摘要】：随着我国煤炭开采深度的增大,煤层回采后工作面底板破断、突水灾害正呈逐年递增的趋势。煤层底板采动破坏后不但易出现底臌变形,而且因其承载强度急剧降低而易发生机架下陷,增加了移架难度。此外,带压开采条件下,底板采动破坏减小了煤层底板的隔水层厚度,导致底板阻水能力降低,增大了底板突水的危险性。因此,动态实时获取和预测煤层底板采动破坏深度对于研究煤层底板阻水能力发挥着重要的作用。本文以山西平朔井工一矿9煤底板突水危险性为研究对象,综合利用理论分析、数值模拟、微震监测等技术手段,对煤层底板采动变形规律和破坏深度开展研究,并取得以下主要研究成果： (1)通过理论分析煤层底板采动应力状态,得到了支撑压力变化规律与底板岩体走向应力分布及传播规律；利用离散元数值模拟软件,获取了采动过程中煤层底板应力场与裂隙场演化规律。 (2)对山西平朔井工一矿9煤19106工作面回采过程进行微震实时监测,开展了微地震波传播规律研究。采用最短距离聚类法进行聚类,以欧氏距离表示微震事件之间的距离,通过计算微震事件之间的距离来评价其亲疏程度,根据其远近程度进行合理分类,最终构建了底板采动破坏深度微震实时获取的一般模式。 (3)基于统一强度理论,推导了底板采动破坏深度普适性公式。利用平朔井工一矿9煤19106回采工作面现场实测的底板采动破坏深度数据样本集,反演得到中间主应力参数b,构建了适用于井工一矿9煤的底板采动破坏深度公式。 (4)基于未确知数学理论,开展底板采动破坏深度动态预测研究。根据山西平朔井工一矿微震监测结果,利用未确知聚类优化法,选取采深、煤层倾角、采厚、构造影响程度4个主要影响因素作为判别指标,建立了煤层底板采动破坏深度动态预测模型,并进行了验证,验证结果表明：该方法构建的底板采动破坏深度动态预测模型是可靠实用的,可以在同类矿山进行推广应用。 (5)提出动突水系数概念并对19106回采工作面底板突水可能性进行了计算。利用突变理论,结合微地震监测结果获取底板稳定隔水层厚度,确定动突水系数,并应用于山西平朔井工一矿19106回采工作面突水可能性评价,结果表明：19106工作面回采期间突水危险性较小。
[Abstract]:With the increase of coal mining depth in China, the coal face floor is broken and the water inrush is increasing year by year. Not only floor heave deformation is easy to occur after mining failure of coal seam floor, but also the frame subsidence is easy to occur because of the sharp decrease of bearing strength, which makes it more difficult to move the frame. In addition, under the condition of mining with pressure, the mining failure of the floor reduces the thickness of the water barrier layer of the coal seam floor, which results in the decrease of the water resistance of the floor and increases the risk of the water inrush of the floor. Therefore, dynamic real-time acquisition and prediction of mining failure depth of coal seam floor plays an important role in studying the water resistance capacity of coal seam floor. Taking the risk of water inrush from No. 9 coal floor in Gongyi Mine of Pingshuo well, Shanxi Province, as the research object, this paper makes comprehensive use of technical means such as theoretical analysis, numerical simulation and microseismic monitoring to study the law of mining deformation and the depth of failure of coal seam floor. The main research results are as follows: (1) through theoretical analysis of mining stress state of coal seam floor, the variation law of supporting pressure and stress distribution and propagation law of rock mass strike are obtained, and the discrete element numerical simulation software is used. The evolution law of stress field and fracture field of coal seam floor during mining process is obtained. (2) the micro-seismic real-time monitoring of the mining process of No. 9 19106 coal face in Pingshuo Coal Mine Shanxi Province is carried out and the propagation law of micro-seismic wave is studied. The shortest distance clustering method is used to cluster, the Euclidean distance is used to represent the distance between microseismic events, and the distance between microseismic events is calculated to evaluate the degree of familiarity. Finally, a general model for real-time acquisition of mining failure depth of floor is constructed. (3) based on the unified strength theory, the universal formula for mining failure depth of floor is derived. In this paper, the sample set of floor mining failure depth measured in No. 9 coal mining face 19106 of Pingshuo mine is used. The intermediate principal stress parameter b is obtained and the mining failure depth formula suitable for No. 9 coal in Jinggong No. 1 Coal Mine is established. (4) based on the unascertained mathematical theory, the dynamic prediction of the floor mining failure depth is carried out. Based on the results of microseismic monitoring in Pingshuo Jinggong No. 1 Mine in Shanxi Province, four main influencing factors, such as mining depth, coal seam dip angle, mining thickness and structural influence degree, are selected as discriminant indexes by using unascertained clustering optimization method. The dynamic prediction model of mining failure depth of coal seam floor is established and verified. The results show that the dynamic prediction model of mining failure depth of coal seam floor is reliable and practical. It can be popularized and applied in similar mines. (5) the concept of dynamic water inrush coefficient is put forward and the possibility of water inrush on the floor of 19106 mining face is calculated. Based on the catastrophe theory and the results of microseismic monitoring, the thickness of the stable diaphragm is obtained, and the coefficient of dynamic water inrush is determined. It is applied to the evaluation of the possibility of water inrush in 19106 mining face of Pingshuo mine, Shanxi Province. The results show that the risk of water inrush is relatively small during the mining period of the working face Wei 19106.
【学位授予单位】：北京科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TD745
本文编号：2191293
[Abstract]:With the increase of coal mining depth in China, the coal face floor is broken and the water inrush is increasing year by year. Not only floor heave deformation is easy to occur after mining failure of coal seam floor, but also the frame subsidence is easy to occur because of the sharp decrease of bearing strength, which makes it more difficult to move the frame. In addition, under the condition of mining with pressure, the mining failure of the floor reduces the thickness of the water barrier layer of the coal seam floor, which results in the decrease of the water resistance of the floor and increases the risk of the water inrush of the floor. Therefore, dynamic real-time acquisition and prediction of mining failure depth of coal seam floor plays an important role in studying the water resistance capacity of coal seam floor. Taking the risk of water inrush from No. 9 coal floor in Gongyi Mine of Pingshuo well, Shanxi Province, as the research object, this paper makes comprehensive use of technical means such as theoretical analysis, numerical simulation and microseismic monitoring to study the law of mining deformation and the depth of failure of coal seam floor. The main research results are as follows: (1) through theoretical analysis of mining stress state of coal seam floor, the variation law of supporting pressure and stress distribution and propagation law of rock mass strike are obtained, and the discrete element numerical simulation software is used. The evolution law of stress field and fracture field of coal seam floor during mining process is obtained. (2) the micro-seismic real-time monitoring of the mining process of No. 9 19106 coal face in Pingshuo Coal Mine Shanxi Province is carried out and the propagation law of micro-seismic wave is studied. The shortest distance clustering method is used to cluster, the Euclidean distance is used to represent the distance between microseismic events, and the distance between microseismic events is calculated to evaluate the degree of familiarity. Finally, a general model for real-time acquisition of mining failure depth of floor is constructed. (3) based on the unified strength theory, the universal formula for mining failure depth of floor is derived. In this paper, the sample set of floor mining failure depth measured in No. 9 coal mining face 19106 of Pingshuo mine is used. The intermediate principal stress parameter b is obtained and the mining failure depth formula suitable for No. 9 coal in Jinggong No. 1 Coal Mine is established. (4) based on the unascertained mathematical theory, the dynamic prediction of the floor mining failure depth is carried out. Based on the results of microseismic monitoring in Pingshuo Jinggong No. 1 Mine in Shanxi Province, four main influencing factors, such as mining depth, coal seam dip angle, mining thickness and structural influence degree, are selected as discriminant indexes by using unascertained clustering optimization method. The dynamic prediction model of mining failure depth of coal seam floor is established and verified. The results show that the dynamic prediction model of mining failure depth of coal seam floor is reliable and practical. It can be popularized and applied in similar mines. (5) the concept of dynamic water inrush coefficient is put forward and the possibility of water inrush on the floor of 19106 mining face is calculated. Based on the catastrophe theory and the results of microseismic monitoring, the thickness of the stable diaphragm is obtained, and the coefficient of dynamic water inrush is determined. It is applied to the evaluation of the possibility of water inrush in 19106 mining face of Pingshuo mine, Shanxi Province. The results show that the risk of water inrush is relatively small during the mining period of the working face Wei 19106.
【学位授予单位】：北京科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TD745
【参考文献】
中国期刊全文数据库 前10条
1 冯启言;杨天鸿;于庆磊;唐春安;冷雪峰;;基于渗流-损伤耦合分析的煤层底板突水过程的数值模拟[J];安全与环境学报;2006年03期
2 尹尚先;武强;;陷落柱概化模式及突水力学判据[J];北京科技大学学报;2006年09期
3 吴爱祥;武力聪;刘晓辉;王春来;黄武胜;朱权洁;;矿山微地震活动时空分布[J];北京科技大学学报;2012年06期
4 左人宇,龚晓南,桂和荣;多因素影响下煤层底板变形破坏规律研究[J];东北煤炭技术;1999年05期
5 王立刚,彭苏萍,罗立平;超细灰对粉煤灰加气混凝土的增强效应[J];低温建筑技术;2001年02期
6 杨天鸿,唐春安,刘红元,朱万成,冯启言;承压水底板突水失稳过程的数值模型初探[J];地质力学学报;2003年03期
7 李海梅;关英斌;杨大兵;;邯邢地区煤层底板应力分布的相似材料模拟分析[J];矿业安全与环保;2007年06期
8 谭志祥;断层突水的力学机制浅析[J];矿业安全与环保;1999年03期
9 赵阳升,段康廉,胡耀青,杨栋,赵宝虎,马宇;块裂介质岩石流体力学研究新进展[J];辽宁工程技术大学学报(自然科学版);1999年05期
10 王希良,彭苏萍,郑世书;深部煤层开采高承压水突水预报及控制[J];辽宁工程技术大学学报;2004年06期
，本文编号：2191293
本文链接：https://www.wllwen.com/kejilunwen/anquangongcheng/2191293.html
