论文部分内容阅读
国内外学者广泛认为原位岩体的纵波波速小于其中岩块的波速,且岩体愈破碎小得愈多。这是将岩体与岩块纵波波速比的平方定义为岩体的完整性系数并写入现行规范的认识基础。然而在部分工程围岩声波测试中却发现,用通常手段得到的大部分岩体的测井波速反而大于岩芯波速。本文围绕声波速度、岩性、坚硬程度、裂隙特征、胶结程度、完整程度、地应力情况对某地铁隧道工程基岩20余个钻孔150余块岩芯进行多种手段的对比研究和综合分析,探讨了岩芯卸荷扰动的声学敏感性及其影响因素。
Domestic and foreign scholars widely believe that the in-situ rock mass is smaller than the longitudinal wave velocity of rock mass, and the more rock crushing smaller and more. This is the basis for understanding the square of rock mass-to-rock mass squared velocity ratio as the integrity coefficient of rock mass and writing it into the current code. However, in some engineering surrounding rock sonic tests, it is found that the logging wave velocities of most of the plutons obtained by the ordinary methods are actually larger than the core wave velocities. In this paper, a contrastive study and comprehensive analysis of more than 150 cores of more than 20 holes in a subway tunnel project are carried out based on the acoustic velocity, lithology, hardness, fracture characteristics, degree of cementing, completeness and stress. The acoustic sensitivity of unloading disturbance and its influencing factors were discussed.