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斜入射线弹性节理应力波传播特征的数值模拟

ISSN号：1000-7598
期刊名称：岩土力学
时间：2013.3.15
页码：901-907
分类：TU452[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071, [2]黄河勘测规划设计有限公司,郑州450003
相关基金：国家杰出青年基金（No.51025935）; 国家自然科学基金（No.11072257）; 国家973计划项目（No.2010CB732001）
相关项目：强震条件下岩体边坡变形破坏机理和安全性评价方法

关键词：应力波, 节理, 透射、反射系数, 数值模拟, 离散元数值软件, stress waves, joint, transmission and reflection coefficients, numerical simulation, UDEC

中文摘要：

依据弹性波理论,应力波斜入射线弹性节理时会发生波场分解。根据入射、透射及反射各波形的不同到时,运用离散元软件UDEC模拟应力波在含倾斜节理岩体中的传播并计算其透射、反射系数,并分析其波型转换规律。应力波斜入射单节理时,模拟得到的透射、反射系数随节理刚度、入射角度的变化规律,与已有的理论解是吻合的。应力波斜入射一组平行节理时,随着节理间距的增大,其同类波的透射系数Tpp、Tss先增大后减小,最后趋于稳定值;节理条数越多,Tpp、Tss越小。此外,不同条数的节理,透射系数达到最大值的临界节理间距值基本一致,但趋于稳定时的节理间距值随节理条数的增加而逐渐增大。

英文摘要：

Based on the elastic wave theory, the stress wave field will separate when it is oblique incidence across a linear elastic joint. The propagation of stress waves in rock mass including oblique joints is analyzed; and the computation of transmission and reflection coefficients is conducted with a universal distinct element code （UDEC）, according to different approaching times of incident, transmitted and reflected waveforms. When stress waves is oblique incidence across a single joint, the simulated relationships between transmission coefficients and joint stiffness, incident angle agree well with the classic theoretical solutions, as well as the reflection coefficients. Furthermore, the situation of stress waves propagate through a set of parallel joints is analyzed. The results show that the transmission coefficients Tpp, Tss of the same kind wave firstly increase to maximum values and then decrease to stable values with the increasing of joint space; and the stable value becomes smaller when the number of joints is larger. Additionally, the critical values of joint space when transmission coefficients approach maximum values are approximately identical for different numbers of joints; but the inflection values of joint space for the situation of stable values gradually become larger with the increasing of joints number.

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