基于坡面锚索和坡脚抗滑桩联合加固边坡的组合设计方法研究

Combined Design Method Research Based on Slope Anchor Cable and Slope Foot Anti Slide Pile Reinforcement

建立了坡面锚索和坡脚抗滑桩联合加固的组合设计方法。通过分析坡面多束锚索预应力在边坡作用力的分布情况,并结合预应力计算边坡的稳定性,以此测算出该边坡桩位处的剩余下滑力,从而促使预应力和抗滑桩被动力之间的相互协调。算例仿真结果表明,结合预应力计算锚索加固程度,其锚索预应力的设计值宜取边坡加固前剩余下滑力的0. 5倍以内,而锚桩加固深度设计为1/3～1/2的锚桩长度为宜,且在一定范围内的主要特征为截面尺寸增大、边坡位移减小、边坡失去稳定性的可能也变小。该研究成果可为边坡稳定性加固提供一种合理的设计方法。

This paper discusses the combined design method of slope anchor cable and slope foot anti slide piles.By analyzing the stress distribution of the slope with multi beam anchor in the slope and calculating the stability of the slope with the pre-stress,the residual sliding force at the slope position is calculated and the mutual coordination between the pre-stress and the anti slide pile is promoted.The simulation results show that the design value of the anchorage cable pre-stress is 0.3- 0.5times more than the remaining sliding force before the slope reinforcement,while the reinforcement depth of the anchor pile can be designed to be 1/3-1/2of the anchor pile length,the main characteristic of the anchor pile is the cross section size and the slope displacement in a certain range.The likelihood of slope instability also decreases.The research results can provide a reasonable design method for slope stability reinforcement.