预应力锚杆复合土钉支护边坡稳定性分析  

Stability analysis of composite soil-nailing wall with prestressed anchors

作　　者：惠趁意[1,2] 朱彦鹏[1,2] 叶帅华[1,2] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050

出　　处：《岩土工程学报》2013年第S2期325-329,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家科技支撑计划项目(2011BAK12B07);甘肃省高等学校科研项目(2013B-018);兰州理工大学建工七七基金项目(TM-QK-1304);兰州理工大学博士基金项目

摘　　要：以极限平衡理论和土钉支护结构稳定性计算的条分法为基础,根据复合土钉支护结构和稳定性安全系数的关系假定滑动面为抛物线形,利用几何关系和积分法建立了最危险滑移面搜索模型和推导了稳定性系数的求解公式,并确定了滑移面几何控制参数与稳定性安全系数之间的函数关系。运用遗传算法对兰州某基坑的预应力锚杆复合土钉支护结构最危险滑移面进行动态搜索,并算出其稳定系数,最后与基于圆弧滑动面破坏模式计算的稳定性安全系数进行对比分析,结果表明,该方法在优化设计中能避免陷入局部最小值,同时证明了该方法进行计算的效率性和一定的准确性。Based on the limit equilibrium theory and the slice analysis method for the stability of soil-nailing structure, according to the assumption of parabolic slip surface for the relationship between the composite soil-nailing support structure and the stability factor of safety, using the geometric relationship and the integration method, a searching model for the most dangerous slip surface is established, and a formula for stability factor of safety is derived. The function relations between the geometrical controlling parameters of sliding surface and the stability factor of safety are deduced. The integral stability of a foundation pit with prestressed anchor composite soil nailing structure in Lanzhou is calculated by using the genetic algorithms. Finally, based on the circular sliding failure model, the stability factor of safety is compared and analyzed. The results show that the proposed method can avoid the optimization design into the local minimum value. Therefore, it is proved that this method has the calculation efficiency and certain accuracy.

关 键 词：复合土钉 稳定性 抛物线 滑移面 遗传算法 

分 类 号：TU476[建筑科学—结构工程] TU43[建筑科学—土工工程]