基于FLAC3D预应力锚杆抗滑桩支护边坡地震响应分析*
黄士奎1,赵 杰2,刘道勇2

(1.国核电力规划设计研究院,北京 100095; 2.大连大学 土木工程技术研究与开发中心,辽宁 大连 116622)

预应力锚杆抗滑桩; FLAC3D; 地震响应; 抗滑桩受力; 加速度

Seismic Response Analysis for the Prestressed Anchor Anti-slide Pile Supporting Slope Based on FLAC3D
HUANG Shikui1,ZHAO Jie2,LIU Daoyong2

(1. State Nuclear Electric Power Planning Design & Research Institute,Beijing 100095,China)(2. The R&D Center of the Civil Engineering Technology,Dalian University,Dalian 116622,Liaoning,China)

prestressed anchor anti-slide pile; FLAC3D; seismic response; anti-slide pile stress; acceleration

备注

建立预应力锚杆抗滑桩支护边坡三维模型,通过坡面监测点分析地震作用下边坡坡面监测点位移、加速度响应以及地震过程中抗滑桩所受剪力与弯矩的受力规律。结果 表明:地震作用下边坡坡面产生永久位移,最大水平位移发生在边坡中下部; 与无支护边坡相比,预应力锚杆抗滑桩支护边坡能有效抑制坡面峰值加速度PGA放大系数。地震作用下抗滑桩随地震历时的增加受力不断变大,最后趋于稳定,其中剪力呈现倒“S”型,桩身弯矩呈现“S”型。研究结论对预应力锚杆抗滑桩支护边坡的抗震设计有一定参考价值。

A3D model of prestressed anchor anti-slide pile supporting slope was built,and the displacement and acceleration response of monitoring points on the surface of side slope,and the law between the forces and bending moment of anti-slide pile under the earthquake was analyzed through the monitoring points on the side slope. The result shows that the perpetual displacement of the surface of side slope was produced under the action of earthquake,and the maximum horizontal displacement occurred in the lower-middle part of the slope. Compared with the slope without support,the prestressed anchor anti-slide pile supporting slope could control the amplification factor of slope surface peak acceleration PGA actively. Under the action of earthquake,the stress of anti-slide pile constantly became larger with the increasing of the diachronic earthquake,and became stable finally. The shear force appeared reverse “S” shape,and the bending moment of pile was appeared “S” shape. The obtained conclusion has the certain reference value for the seismic design of the prestressed anchor anti-slide pile.