深基坑锚拉支护结构地震时程分析及静动对比研究

Seismic time history analysis and static-dynamic comparative study on anchored supporting structure of deep foundation pit

通过一个经历"5.12汶川特大地震"仍处于稳定状态基坑的地震时程分析,研究了基坑锚拉支护结构体系在地震荷载作用下状态变化及其规律性,与按现行规程方法设计的锚拉支护结构在静荷载作用时的水平位移等值线、矢量特征、破坏分布特征和现场监测成果等进行对比分析,掌握了按现行规程方法设计的基坑支护结构除承受正常的静压力作用外,仍可以承受一定能级的地震等动荷载,并能维持基坑的稳定性。说明现行规程设计方法设计的锚拉支护结构具有一定的安全储备,在正常情况下存在可进一步优化的空间。

By the seismic time history of the foundation pit which is still stable after 5.12 Wenchuan Earthquake,changing rules of the state of system of anchored supporting structure during the earthquake are studied.Compared horizontal displacement contour,vector characteristics,damage distribution with the results of in-situ tests on anchored supporting structure designed by specification under the static load,it is concluded that the supporting structure designed by specification can bear the static load and endure certain seismic load and maintain the stability of foundation pit.In a word,the anchored supporting structure designed by specification has certain emergency capacity and can be optimized under normal conditions.