云南文山马鹿塘特大桥北侧岸坡稳定性评价

The bank slope stability evaluation of the north of the Malutang super-huge bridge in Wenshan,Yunnan Province

以文山马鹿塘某高速特大桥北侧岸坡为例,首先对北侧岸坡地质条件特征进行分析,然后采用赤平投影法、刚体极限平衡法及强度折减法对北侧岸坡进行稳定性分析。结果表明,刚体极限平衡法(简化Bishop法)计算的安全系数相对较低;北侧岸坡主塔上斜坡不满足稳定性控制标准,主塔下斜坡满足稳定性控制标准;需要对主塔上斜坡采取加固措施。

In this paper,taking the north bank slope of a motorway bridge in Malutang Wenshan as an example,the conditions of geological conditions in the north bank slope,and then the analysis of the north bank slope by means of stereographic projection method,rigid-body limit equilibrium method and strength reduction finite element method.It is concluded that the safety factor calculated by the rigid body limit equilibrium method(simplified Bishop method)is relatively low;the upper side slope of the north bank slope main tower don’t meet the stability control standard,and the lower slope of the main tower meets the stability control standard;it is necessary to take reinforcement measures for the upper slope of the main tower.