基于桩前土体抗力边坡抗滑桩内力特性数值研究

Study on Characteristics of Internal Force of Anti-slide Pile vs.Soil Resistance before Pile Based on Finite Element Software

抗滑桩在滑坡治理及边坡支护方面得到广泛应用,但在抗滑桩实际设计中,很多技术人员并未将桩前土体抗力纳入考虑机制,仅考虑滑坡推力的影响,导致材料用量大幅增多。为此,以云南某公路边坡工程作为研究对象,基于ABAQUS有限元软件对考虑和忽略桩前土体抗力两种不同情况下抗滑桩内力进行了研究,深入分析了黏聚力、内摩擦角与桩前土体坡度对抗滑桩内力的影响。结果表明:当桩前土体抗剪参数相同,桩前土体坡度越大,边坡土与抗滑桩横向位移越大;当桩前土体坡度超过40°,桩前土体抗力对边坡抗滑产生显著作用,此时边坡抗滑桩设计时必须将其作为设计考虑因素。

Anti-slide pile is widely used in landslide control and slope support,however,in the practical design,the soil resistance before pile does not taken into account,but landslide thrust considered only,which leads to substantial increase in consumption of the material.Herein the slope engineering of a highway in Yunnan Province was taken as the object to study with ABAQUS finite element software the internal force of anti-slide pile on the condition of considering and ignoring the soil resistance before pile,furthermore,to analyzed deeply the effects of cohesion,internal friction angle and soil slope before pile thereon.The results show that,in case of the same shear parameter of soil mass before pile,the larger the soil slope before pile,the larger the lateral displacement of the soil and the anti-slide pile;when the soil slope before pile is larger than 40°,the soil resistance before pile may work perfectly with slide resistance of slope,thus must be taken into consideration in the design of anti-slide pile.