含充填岩石节理对应力波透反射特征影响的机制与规律研究

项目名称： 含充填岩石节理对应力波透反射特征影响的机制与规律研究

项目编号： No.41272348

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 李建春

作者单位： 中国科学院武汉岩土力学研究所

项目金额： 85万元

中文摘要： 节理的存在使得应力波在岩体的传播过程中发生复杂的透反射现象，揭示含充填岩石节理对应力波透反射特征影响的机制与规律对于保障地震和爆破作用下岩体边坡和洞室的安全具有重要的意义。本项目首先应用霍普金森杆（SHPB）实验进行P波通过充填节理的透反射实验，研究输入杆和输出杆上的透射波和反射波，揭示影响应力波透反射特性的机制，并反映节理的充填材料、厚度和含水率对应力波透反射特性的影响。其次，根据实验结果分析应力波和节理的闭合量之间的关系，建立充填节理的动态法向力学模型。再次，通过分析两个节理面上的应力关系以及相对应的位移关系，建立考虑节理厚度效应的应力波传播方程，计算透反射应力波，并通过和实验的比较，验证理论分析的正确性。再此理论基础上分析节理对应力波透反射特性的影响机制，并研究充填节理的物理参数和应力波透反射规律的相关关系。研究成果对于深入理解应力波在节理处传播的复杂过程具有重要的意义。

中文关键词： 岩石节理；应力波；ＳＨＰＢ实验；透反射规律；透反射机制

英文摘要： Because of the existing of joints, the wave propagation across a rock mass is very complicated. It is significant to understand the transmission and reflection mechanism caused by rock joints, which is an important topic in rock dynamics and has received considerable attention in geophysics, mining and underground construction. In this regard, the split Hopkinson pressure bar (SHPB) tests will firstly be carried out for longitudinal- (P-) wave propagation across a filled joints in the present research. From the test recordings, the reflected and transmitted waves produced from the joint will be obtained. The mechanism for the effect the filled joints on wave propagation is then investigated. The parametrical study for the effects of the filling material, the thickness and the water content of the joints on wave reflection and transmission will also be studied. In order to carry out the following theoretical study, we then want to know the dynamic model of the filled joints, which can be obtained from the test results for the stress vs closure curve of the filled joints. Thirdly, we will conduct the theoretial study to analyze the transmission and reflection mechanism caused by the filled rock joint. The stresses on the two sides of the filled joints can be observed from the test, from which the current displac

英文关键词： Rock joint；Stress wave；SHPB test；Transmission and reflection mechanism；Transmission and reflection laws