地震波作用下桩-锚支护切方直立土坡的动力响应分析

DYNAMIC ANALYSIS OF THE VERTICAL SOIL SLOPE SUPPORTED WITH PILE-ANCHOR SYSTEM SUBJECTED TO EARTHQUAKE WAVE

桩-锚联合支护是边坡加固和治理工程中极为有效的支护形式。开展地震荷载作用下桩-锚支护土坡动力响应研究,对分析桩-锚支护土坡的抗震性能及在地震中的破坏机理,合理指导边坡支护抗震设计等方面都具有十分重要的意义。通过建立一个切方直立土坡概化模型,按常规设计参数建立桩-锚支护体系;通过数值分析获得边坡静力条件下应力-应变状态和桩-锚结构内力状态;在此基础上施加地震波,进行桩-锚支护边坡系统的动力分析,得到坡体速度、位移、土压力、坡顶拉应力及桩-锚结构的剪力、弯矩和锚杆轴力的动力响应,揭示桩-锚支护体系的动力特性。结果显示,桩-锚支护对边坡变形、整体稳定及坡顶拉应力都具有很好的控制作用,表明桩-锚支护体系具有相当好的抗震性能。

Pile-anchor system is widely applied in slope-reinforcing engineering.The study on dynamic response of the soil slope supported with pile-anchor system subjected to earthquake wave is very important to finding out failure mechanism and seismic character of the slope,and guiding slope reinforcing design.A vertical soil slope model with pile-anchor system was established,The stresses and strains,moments and shear forces of the pile and anchor axial force were obtained.By applying seismic wave dynamic analysis of the slope applied with piles and anchors was performed,and the velocities,displacements,soil pressures,tension stresses of the slope surface,shear forces and moments of the piles,and anchor axial forces dynamic response were obtained.Moreover,pile-anchor system dynamic character was displayed,the results showed that pile-anchor system could validly control the deformation,slope stability and tension stresses on slope top surface,and had very good anti-earthquake capability.