摘要
采用RFPA数值模拟软件对深埋垂直板裂结构岩体中洞室围岩失稳破坏过程进行了模拟,研究了在不同侧压力系数条件下板裂围岩的失稳破坏特点,并与完整岩体中相同条件下的洞室的失稳破坏情况进行了对比.研究结果表明,侧压力系数对深埋垂直板裂结构洞室围岩的破坏形式具有重要影响,边墙岩柱的溃屈失稳破坏发生在侧压力系数小于1的情况;当侧压力系数大于1时,破坏集中发生在拱顶和隧道底部,边墙岩柱不发生溃屈破坏.指出梁板理论应用于板裂结构岩体洞室稳定性评价的局限性.在深埋情况下,洞室围岩的破坏以应力控制为主,结构面的影响居于次要地位.
Using the RFPA numerical code, the failure process of vertically stratified rock mass around underground excavations is simulated and the failure characteristics between vertically stratified and intact rock mass are comparatively discussed under different lateral pressure coefficients. The results show that the lateral pressure coefficient has a significant influence on the failure mode of vertically stratified rock mass. Only if the lateral pressure coefficient is smaller than 1, would the side walls take the buckling failure mode; or else, the failure zones mainly concentrate at the crown and floor of tunnel. It is also found that the beam-slab theory in application to the structural mechanics does not entirely suit the stability evaluation of vertically stratified rock mass. Furthermore, it is found that for deep excavations the failure mode of rock mass is controlled mainly by the stress instead of structural planes. It is the stress that mainly controls the failure mode of rock mass, other than the structural plane in the rock mass.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第6期893-896,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金重点项目(40638040)
国家自然科学基金资助项目(106720285049027450674025)
关键词
层状岩体
失稳破坏
侧压力系数
数值模拟
stratified rock mass
failure
lateral pressure coefficient
numerical simulation
