抗滑桩锚固深度的可靠度与参数敏感性

Reliability and parametric sensitivity of anchorage depth of anti-slide piles

为了研究岩土体物理力学参数变异性对抗滑桩锚固深度的影响,以抗滑桩锚固深度确定的强度折减法为基础,建立了抗滑桩锚固深度可靠性分析的极限状态方程.工程实例分析表明:参数变异性对锚固深度的可靠度有较大影响,采用可靠性设计确定抗滑桩锚固深度比较合理;锚固深度可靠度对滑坡推力与剩余抗滑力之差H及锚固段岩土体密度ρ、内摩擦角φ的敏感性较强,而对桩前滑动面处的地基系数A及比例系数m的敏感性较弱.

In order to study the effect of variability of physical and mechanical parameters of rock and soil on the anchorage depth of anti-sliding piles,the limit state equations for the reliability analysis of the anchorage depth of anti-slide piles were established based on the strength reduction method.The case study shows that the variability of parameters has large effect on the anchorage depth.It is rational to determine the anchorage depth of anti-slide piles by means of the reliability design.The reliability of the anchorage depth is sensitive to the variability of difference between sliding thrust and residual sliding resistance H,density of rock and soil in anchorage section ρ and internal friction angle φ,but its sensitivity to foundation coefficient A and proportionality coefficient m is weak.