锚固边坡地震动力稳定性计算方法  

Dynamic stability calculation method for anchor slope based on stress state

作　　者：董建华[1,2,3] 朱彦鹏[1,2] 马巍[3] 

机构地区：[1]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 [2]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [3]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《振动工程学报》2013年第4期633-640,共8页Journal of Vibration Engineering

基　　金：国家科技支撑计划资助项目(2011BAK12B07);国家自然科学基金资助项目(50978129,51108221,51268037);高等学校博士学科点专项科研基金联合资助项目(20116201120002);甘肃省高校基本科研业务费专项资助项目(1204ZTC058);甘肃省自然科学基金资助项目(1014RJZA016);兰州理工大学科研发展基金资助项目(BS04200901)

摘　　要：建立了均匀弹性土体边坡静力和动力简化计算模型,求解了边坡静力和动力应力场。锚固体系在一定程度上弥补了开挖卸荷引起的侧向应力的减小,将其等效为土体强度的增加。基于似粘聚力原理和极限平衡理论,推导出土体强度增量表达式。根据土体边坡滑动面的破坏模式,建立了考虑锚固作用的边坡动力稳定性计算模型。利用遗传算法对最危险滑移面的圆心进行动态搜索,实现了锚固边坡动力稳定最小安全系数的自动寻优。最后结合具体工程实例进行了分析,并和有限元时程强度折减法进行了对比,结果表明这种计算方法对土质较均匀的黄土地区是可行的。A static and dynamic simplified calculation model is established for homogeneous soil slope and the analytical solutions are obtained for slope static and dynamic stresses.As the anchorage system makes up for the lateral stress losses caused by the excavation unloading in a certain extent,its strengthening action is equivalent to soil strength increase.Based on the principle of pseudo-cohesion and limit equilibrium theory,the incremental function of strength of soil strengthened by the anchorage system is deduced.According to the soil slope failure mode,the slope dynamic stability calculation model and search model of the slip surface are set up.Dynamically search of the circle center of the most dangerous slip surface is carried out by using the genetic algorithms,to achieve automatic optimization course of the minimum dynamic stability safety coefficient of the anchored slope.Finally,the method is applied to a case record to illustrate its capability,the results show that the proposal method is reliable.

关 键 词：锚固体系 动力稳定性 边坡 似粘聚力 遗传算法 

分 类 号：TU757.2[建筑科学—建筑技术科学] TU457