关于龙游石窟4号洞4-2号岩柱长期抗剪强度反分析问题的讨论

对于地下工程来说,围岩的长期抗剪强度从来是工程设计者和研究者所关心的课题。但历来仅根据持续时间十分 有限的试验来确定。因此从某种意义上说,由这类试验所得到的,并非真正意义上的长期抗剪强度。所以,本文提出的根据 龙游大型古地下工程即龙游石窟岩柱(包括柱础)的剪坏现象反算岩柱的长期抗剪强度的成果,是很有理论价值的。本文将 以龙游石窟4号洞的4-2号岩柱为对象作古地下工程岩柱长期抗剪强度的反演研究。为了在反演中能进一步考虑剪切面上 各部位的应力变化,作者还借助于FLAC-3D分析结果对不同部分分别进行研究,从而取得了较好的反演结果。

ON BACK ANALYSIS OF LONG-TERM SHEAR STRENGTH OF NO.4-2 ROCK PILLAR IN THE NO.4 CAVERN OF LONGYOU CAVERNS

For an underground structure, long-term shear strength of the surrounding rock always concerns engineering designers and researchers. In fact, the shear strength tested within a limited time period does not truly reflect its long-term strength. Therefore, it is very important to conversely calculate the long-term shear strength of rock pillar (including the base of pillar) of large ancient underground caverns, based on its shearing failure. In this paper the back analysis of long-term shear strength of no.4-2 rock pillar in the no.4 cavern at Longyou Caverns is presented. In order to further consider distribution of stresses in different parts of the shearing surface, the authors used FLAC-3D in simulation. The results shows.