摘要
通过现场开挖边坡卸倚岩体不同距离的声波测试，研究了卸荷岩体的声波传播特性，并采用卸荷岩体力学的观点和方法，对声波测试结果进行了分析，得到了不同方向声波速度的变化规律，并发现其具有明显的正交异性特征，然后根据声波的传播特性，划分了边坡开挖后岩体不同的卸荷区域，确定了各卸荷区岩体宏观力学参数，最后与试验结果进行了比较，得到了比较一致的结论。
In order to study the acoustic wave propagation properties and the ratio of dynamic elastic moduli to static one for unloading rock mass of Three Gorges Project, based on the results of the acoustic wave measurement on the unloading rock mass in the digged slope of the Three Gorges Project, firstly the propagation characteristics of the acoustic wave in rock mass are studied, and the testing results of acoustic wave method are obtained. Taking the ideas and methods of unloading rock mass mechanics, the results of acoustic wave measurement are analyzed and the corresponding changing laws of acoustic wave in different directions and the different wave speed at different altitude of unloading rock slope, which have obvious orthogonal-anisotropy characteristics, are gained. Then different unloading regions are classified based on the propagation characteristics of the acoustic wave, and the macro-mechanical parameters of unloading rocks of each unloading region are determined. Finally the relation between stress and strain in tfiaxial unloading test is given, and the relation between the relative elasticity modulus Ei and L gained by the finite element analyses is listed. Comparison between the results of the acoustic wave measurement and those of exoeriment shows good arreement.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A01期4642-4646,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目（50379023）
湖北省高等学校优秀中青年科技团队计划资助项目（鄂教科[2004]7号）
关键词
岩土工程
三峡工程
卸荷岩体
声波测试
正交异性
宏观力学参数
geotechnical engineering
Three Gorges Project
unloading rock mass
acoustic wave method
orthogonal anisotropy
macro-mechanical parameters
