超前支护桩桩后EPS垫层优化设置的数值模拟  

EPS Cushion of Forepoling Pile and Its Optimization by Numerical Simulation

作　　者：孙洪利[1] 刘元雪[2] 叶四桥[3] 冉仕平 

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710075 [2]后勤工程学院建筑工程学院,重庆400041 [3]重庆交通大学河海学院,重庆400074 [4]西藏自治区发展和改革委员会,西藏拉萨820000

出　　处：《重庆交通大学学报（自然科学版）》2011年第4期786-789,879,共5页Journal of Chongqing Jiaotong University(Natural Science)

摘　　要：出于减小高切坡超前支护桩桩身荷载、优化超前支护桩设计的目的,提出在超前支护桩后设置聚苯乙烯泡沫(EPS)垫层。运用数值模拟方法,进行了超前支护桩后设置不同厚度、不同类型的EPS垫层情形下的敏感性分析。结果表明:设置EPS垫层后,桩身所受土压力、最大弯矩、最大剪力及桩顶位移均显著减小,在0～0.8 m垫层厚度范围内,随着垫层厚度的增加减小幅度越大,其中桩身土压力减小幅度达20%～45%;对于不同类型的EPS材料而言,桩身荷载效应具有随着EPS材料密度的减小而减小的规律。Aiming at reducing the loads on forepoling piles and optimizing its design, a polystyrene foam （EPS） cushion was proposed to set up behind the forepoling pile. The sensitivity analysis was implemented under the conditions of＇ different cushion thickness, different types of EPS by numerical simulation. The research results show that： After setting EPS cushion, the soil pressure, maximum moment and maximum shear force on forepoling pile and pile top displacement are signifi- cantly reduced. And in the range 0 -0.8m cushion, the thicker the cushion is, the more significant the reduction is. For example, the earth pressure on forepoling pile decreases by 20% to 45%. For different types of EPS materials, the load effect on pile decreases with EPS material density decreasing.

关 键 词：超前支护桩 EPS垫层 数值模拟 

分 类 号：P642.23[天文地球—工程地质学]