考虑拉伸屈服强度折减的节理岩质边坡抗震稳定性分析

Seismic stability analysis of jointed rock slope of the tensile yield strength reduction

传统的强度折减法未对材料的抗拉强度进行同时折减,在其对含节理面岩质边坡进行稳定性分析过程中,求得的安全系数具有较大的误差,未考虑拉破坏屈服的安全系数大于考虑拉破坏屈服的安全系数.在考虑拉伸屈服强度折减理论分析基础上,采用考虑拉伸破坏的M-C准则对含结理面岩质边坡进行稳定性分析,给出塑性区的分布及发展规律,求得安全系数.并基于此采用拟静力法对地震荷载作用下含节理面岩质边坡进行分析,得出在地震荷载作用下结构的安全系数降低,塑性区分布更广,从而降低了结构的安全储备,对工程应用具有指导意义.

The traditional M-C criterion doesn＇t take the tension fracture of the rock into consideration.When using the criterion analyses of the stability of the rock slope,it will inspire a large error.The tension fracture of finite element strength reduction method is analyzed.The test,using M-C criterion considering tension fracture analyses of the stability of the rock slope with weak joint surface,shows the development and the distribution of the plastic range and gets the factor of safety.And the analysis of the stability of the rock slope with weak joint surface under the seismic load shows that the seismic load lowers the factor of safety and widens the plastic range.The seismic load lowers the safety stock of the slope,as has a guiding significance in engineering.