地震作用下土钉支护边坡永久位移计算方法研究  

PERMANENT DISPLACEMENT ASSESSMENT OF SLOPE PROTECTED BY SOIL NAILING RETAINING WALL UNDER EARTHQUAKE

作　　者：董建华[1] 朱彦鹏[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《工程力学》2011年第10期101-110,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(50978129);甘肃省科技厅攻关项目(2GS064-A52-040);兰州理工大学科研发展基金项目(BS04200901)

摘　　要：基于拟静力稳定性分析模型,建立了地震作用下土钉支护边坡永久位移计算方法。提出了永久位移由地震作用过程中位移和震后位移两部分组成。在求解平均加速度时,将边坡考虑为弹性体对Newmark有限滑动位移法的刚性假定进行改进。采用遗传算法动态寻优实现边坡地震过程中永久位移计算。运用功能原理建立地震作用后永久位移计算模型并求解。根据土钉柔性结构特性,对土钉震后随土体滑移机理提出褶皱台阶变形来计算土钉的滑移摩阻做功。给出基于边坡永久位移控制的土钉支护结构动态设计理念及程序步骤,并用实例进行计算及数值验证,结果表明震后位移量与地震作用过程中位移的比值很大,因此震后位移不能忽略。Based on the analysis model of pseudo-static stability, a permanent displacement calculation model of slope protected by soil nailing under earthquake is established. The total permanent displacement consisted of two parts of the earthquake displacement and the post-earthquake displacement is proposed. The solution of average acceleration adopts the elastic dynamic calculating model to improve the rigidity assumptions of the Newmark method. Using genetic algorithms to search yield acceleration can achieve the permanent displacement of slope under earthquake. Employing the principle of work and energy, the calculating model of a post-earthquake permanent displacement is established and solved. According to flexible soil nailing characteristic, the ＂folding steps＂ slip deformation mechanism is proposed to calculate the sliding friction works of soil nailing after the earthquake. The dynamic design philosophy and flow chart of the soil nailing structure are given based on the control of the permanent displacement of the slope. The analytical results show that the ratio of a post-earthquake displacement to a seismic displacement is great, and the post-earthquake displacement can not be ignored.

关 键 词：土钉 边坡 地震稳定 永久位移 抗震设计 数值分析 

分 类 号：TU476[建筑科学—结构工程]