裂隙岩体工程爆破动力响应规律研究

发布时间：2018-01-02 14:34

本文关键词：裂隙岩体工程爆破动力响应规律研究　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：自然界的岩体通常发育有大量的节理裂隙等结构面,结构面相互交叉将岩体切割成不同形状的岩块。根据块体理论将块体进行稳定性评价,划分为稳定、可能失稳及失稳三种类型。可能失稳的块体通常暴露于临空面中,并且在地下重复爆破开采扰动下可能沿结构面发生破坏,造成岩体工程的破坏。因此研究爆破动力对裂隙岩体工程的影响具有重要的实际意义。以铜坑矿为工程研究背景,通过实地测量、现场试验、ANSYS数值模拟及理论分析相综合,分析了裂隙巷道在爆破动力扰动下的响应规律,主要研究内容与结果： (1)通过地质调查,确定了节理裂隙发育情况,选定了某巷道为研究对象；基于块体理论,对巷道周围的可能失稳岩块进行提取和划分。 (2)通过现场现场爆破振动测试获取了振动数据,并利用MATLAB软件计算出与波衰减系数有关的k,α值。 (3)通过建立结构面不同状态下的有限元分析模型,分析了结构面厚度、角度和材料特性对应力波传播影响。结果显示波的衰减程度与结构面厚度成近似正比关系；结构面角度值越大,对应力波的阻碍作用越大；结构面充填物物理性质与两侧岩石相差越大,结构面对应力波的阻碍作用越大。 (4)利用ANSYS软件建立了裂隙巷道爆破动力响应模型,分析了巷道围岩动力响应规律。通过对质点振速、位移和应力综合分析可知：质点振速峰值虽然在安全范围内,但在巷道顶部和迎爆侧的结构面材料中会产生较大的拉应力,拉应力值可能造成结构面材料破坏,导致岩块沿结构面发生失稳破坏。图53幅,表19个,参考文献74篇
[Abstract]:Absrtact: the rock mass in nature usually has a large number of structural planes such as joints and fissures. The rock mass is cut into blocks with different shapes by intersecting the structural planes. According to block theory, the block stability is evaluated and divided into stability. There are three types of possible instability and instability. Blocks which may be unstable are usually exposed to the face of the goaf and may be destroyed along the structural surface under the disturbance of underground repeated blasting mining. Therefore, it is of great practical significance to study the influence of blasting dynamics on rock mass engineering. Taking Tongkeng mine as the background of engineering research, through field measurement, field test, ANSYS numerical simulation and theoretical analysis, the response law of fractured roadway under blasting dynamic disturbance is analyzed. The main contents and results are as follows: 1) through geological investigation, the development of joints and fissures is determined, and a certain roadway is selected as the research object. Based on the block theory, the possible unstable rock blocks around the roadway are extracted and divided. (2) the vibration data are obtained by field blasting vibration test, and the K, 伪 values related to wave attenuation coefficient are calculated by using MATLAB software. 3) the thickness of the structural plane is analyzed by establishing the finite element analysis model of the structural plane in different states. The results show that the attenuation degree of the wave is approximately proportional to the thickness of the structure plane. The bigger the angle value of the structure plane is, the greater the hindrance of the corresponding force wave is. The larger the difference between the physical properties of the filling and the rock on both sides, the greater the hindrance of the structure to the stress wave. (4) the blasting dynamic response model of fractured roadway is established by using ANSYS software, and the dynamic response law of surrounding rock of roadway is analyzed. The comprehensive analysis of displacement and stress shows that the peak value of particle vibration velocity is in the safe range, but in the top of roadway and in the face of explosion side of the structural surface material will produce a large tensile stress, tensile stress value may cause damage to the structural plane material. Results in instability failure of rock block along structural surface. 53 figure, 19 tables, 74 refs.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU452

【共引文献】