【作者】 梁宇钒； 邱天琦； 杨军； 吴志轩； 陈汉奇；

【Author】 LIANG Yu-fan;QIU Tian-qi;YANG Jun;WU Zhi-xuan;CHEN Han-qi;China Road and Bridge Corporation;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University;

【机构】 中国路桥工程有限责任公司； 清华大学土木工程安全与耐久教育部重点实验室；

【摘要】 为充分考虑复理石的层状结构对顺层边坡稳定性的影响,以由岩块和岩层面组成的层状边坡为分析对象,采用有限元极限分析法的显式、隐式节理两种模拟手段,分析了不同岩层倾角下顺层边坡安全系数变化规律与失稳破坏模式。结果表明:岩层倾角在0°～45°范围内,显式、隐式节理法得到的安全系数几乎相同,在45°～90°范围内,隐式节理法得到的安全系数略小于显式节理法,两种方法的选择对边坡破坏模式的影响不大;岩层倾角由0°增至90°,安全系数先减小后增大后略微减小,相比完整岩体均质边坡最大折减约55%,破坏模式依次为剪切-滑出式、滑移-拉裂式、整体顺层滑移式、滑移-剪出式、剪切-顺层滑裂式、整体剪切式,破坏面均过坡脚,除90°倾角外,破坏面或部分破坏面由层面组成。更多还原

【Abstract】 Aiming at fully considering the influence of layer structure of flysch on the stability of bedding slope, taking the stratified slope composed of rock mass and bedding planes as research subject, safety factors and failure mechanism of bedding slope with different dip angles of bedding planes were analyzed by finite element limit analysis method applying both explicit joint model and implicit joint model. Furthermore, the most unfavorable occurrence of bedding planes in bedding slope was discussed and a simplified analysis method for gently inclined slope was presented. The results show that with dip angle of bedding planes in the range of 0°～45°, safety factors are almost same that calculated by explicit joint slope model and that by implicit joint model. While in the range of 45°～90° the latter is smaller. The choice of two models has no significant influence on slope failure mode. As dip angle of bedding planes increases from 0° to 90°, safety factor decreases first then increases and then decreases slightly. The largest reduction of safety factor comparing with slope without bedding planes is about 55%. Failure mechanism shows a progress of shear-sliding-out failure, sliding-tensile failure, overall bedding-slip failure, slip-cut-out failure, shear-slip failure, overall shear failure. All the failure surfaces are through the toe of slope. Failure surface or part of failure surface is composed of bedding plane except when the dip angle is 90°.更多还原