【作者】 邱天琦； 杨军； 吴志轩； 沈兆普； 梁宇钒；

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

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

【摘要】 最危险岩层倾角为0°~90°范围内使边坡安全系数最小的岩层倾角,该倾角是对顺层边坡稳定性最不利的岩层产状。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隐式节理模型分析了不同坡角对应的最危险岩层倾角。结果表明:最危险岩层倾角随坡角的增大而增大,对应安全系数的变化规律相反,最危险岩层倾角下的破坏均为整体顺层滑移破坏;通过极限平衡法得到最危险岩层倾角的理论公式,计算结果与有限元极限分析法偏离不超过2%;在众多岩层面中,对缓倾顺层边坡稳定性起决定性作用的为过坡脚的层面,采用单一层面简化模型得到的边坡破坏模式与常规模型相近,安全系数偏离不超过3%,缓倾顺层边坡可利用此模型进行简化的边坡稳定分析。更多还原

【Abstract】 The most dangerous dip angle is the bedding plane angle which makes the safety factor of the slope minimum. This the most unfavorable attitude of rocks for the stability of bedding slope. Taking the layered slope composed of rock mass and bedding planes as research subject, the most dangerous dip angles for slopes with different slope angles were analyzed by finite element limit analysis method applying implicit joint model. The results show that, as the increasing of the slope angle, the most dangerous dip angle of bedding planes increases while the corresponding safety factor decreases. Failures under the most dangerous dip angle are all overall shear failure. The theoretical formula of the most dangerous dip angle was deduced by limit equilibrium method. The deviation of result calculated by theoretical formula and that analyzed by finite element limit analysis method is less than 2%. Among the many bedding planes, the one through slope toe plays a critical role in the stability of gently inclined bedding slope. With the deviation of safety factors less than 3%, slope failure mode analyzed by simplified model with a single bedding plane is very close to that analyzed by normal sophisticated model, which supports the applicability of the simplified analysis method.更多还原