岩土工程学报2016，Vol.38Issue(z2)：190-197,8.DOI:10.11779/CJGE2016S2031
脆性岩体开挖损伤区范围与影响因素研究
Excavation damage zone depth and influence factors of brittle rock
摘要
Abstract
The stress-induced excavation damage occupies the main position in brittle rock mass of underground engineering. Based on the excavation damage database of underground opening, the empirical formula for damage depth of hard rock put forward by Kaiser is revised. By considering the effect of the initial stress ratio, the revised empirical formula is improved with a certain extent in the goodness of fitting and prediction accuracy. For further studies on excavation damage zone and its influencing factors, the crack initial criterion (CIC) is put forward as the mechanical index for damage zone. It is found that the damage depth assessed by CIC is coincident with the predicted values by the empirical formula and filed measured values, indicating that CIC as the index for damage zone has good feasibility. On the basis of CIC, the induced stress and damage range of the surrounding rock are analyzed under different opening shapes and orientations. It is shown that the "Harmonious hole" is not the most reasonable shape under high stress field. By setting a small radius of curvature in the minor principal stress direction, the high compression stress can be limited within a local scope, and thus a wide range of surrounding rock damage of underground engineering can be avoided. The related understanding and conclusions are of certain theoretical and engineering significance.关键词
地下洞室/开挖损伤区(EDZ)/经验公式/起裂判据(CIC)/洞室形状/曲率半径Key words
underground opening/excavation damage zone/empirical formula/crack initial criterion/opening shape/radius of curvature分类
建筑与水利引用本文复制引用
李建贺,盛谦,朱泽奇,刘世伟,程红战,周兴涛..脆性岩体开挖损伤区范围与影响因素研究[J].岩土工程学报,2016,38(z2):190-197,8.基金项目
国家重点基础研究发展计划（“973”）项目（2015CB057905）；NSFC-云南联合基金重点支持项目（U1402231）；国家自然科学基金面上项目 （）
