地应力作用下复杂岩体中弹性波传播规律研究

项目名称： 地应力作用下复杂岩体中弹性波传播规律研究

项目编号： No.11272304

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 徐松林

作者单位： 中国科学技术大学

项目金额： 78万元

中文摘要： 原位岩体处于复杂地应力状态，现场声波和地震波测试结果非常复杂，严重影响到岩体评价和工程设计与施工。本项目试图探索解决此困境的途径。实验方面研究复杂应力状态（包括加卸荷过程）下，岩体中细观结构对弹性波传播规律的影响，以及卸荷的时间效应。此方面尚未见成熟工作。为克服现行理论的困难，理论研究采用多尺度分析思想，细观上研究岩体中的双裂纹、双孔洞及孔洞-裂纹组成的双"缺陷"体系对波的散射效应，宏观上则采用等效介质分析方法，研究复杂应力状态下波在"双缺陷"介质中的传播，以形成科学的现场测试技术。为探讨应用现场声波和地震波技术测试地应力水平的可能性，将引入量纲理论分析方法，结合上述理论进行更深入理论研究。本申请的多尺度模型可描述强频散问题，极大促进岩石物理理论模型的研究，推动地震波理论的发展和完善。本研究揭示的在复杂地应力状态下岩体的波动响应规律，对水利工程、矿山工程、物探等领域有十分重要的实用意义。

中文关键词： 弹性波传播；复杂岩体；多尺度分析；复杂应力状态；量纲分析

英文摘要： Since in-situ rock masss are under complex geostress state,it is difficult to get useful informations from in-situ acoustic and seismic testing results, which greatly affects the rock mass evaluation and Engineering design and construction. This project seeks to find ways to solve this problem. In the experimental research, influences of micro- and meso-structure in rock mass to the elastic wave velocity are investigated for rocks in complicated stress states, including in the loading process and in the unloading process. The hysteresis effects in unloading peocess are studied. This has yet to see a mature work. In the theoretical research, the multical scale analysis method is employed to overcome the difficulies of existing theories. At the meso scale, a "double defects" system, which consists of two cracks, two hlos, or one crack and one hole, is used to study the scattering behavior in complicated rock mass. At the macro scale, the equivalent media theory is used to study the wave propagation in "double defects" rock under complicated stress state. This theoretical research may lead to a powerful in-situ testing technology. To explore the possibility of using the acoustic and seismic method to measure the geostress, a dimensional analysis method is introduced to simplify this process. The multi scale analys

英文关键词： Elastic wave propagation；complicated rock mass；multi-scale investigation；complicated stress state；dimensional analyse