黄土双排抗滑桩模型试验  

Research on model test of double row anti-slide piles in loess

作　　者：李阳[1] 南亚林[1] 贺海超[1] 张鹏[1] LI Yang;NAN Ya-lin;HE Hai-chao;ZHANG Peng(China Electronic Research Institute of Engineering Investigations and Design,Xi'an 710054,China)

机构地区：[1]信息产业部电子综合勘察研究院,西安710054

出　　处：《安全与环境学报》2022年第3期1315-1322,共8页Journal of Safety and Environment

基　　金：陕西省重点研发计划项目(2022SF-338,2017ZDXXL-SF-03-02,2019ZDLSF05-07,2020SF-386);信息产业部电子综合勘察研究院科研项目(2021-DKY-N01)。

摘　　要：黄土边坡具有水敏性、滑面较深呈圆弧形、滑坡推力大的特点,相较于传统单排抗滑桩,双排抗滑桩能够提供更大的抗滑力,在黄土滑坡治理中有一定优势。通过模型试验和理论分析方法,研究了多种布桩形式下双排抗滑桩的受力、变形、破坏过程。结果表明:双排抗滑桩后排桩桩后土压力在滑面以上呈梯形分布、滑面以下呈矩形分布;前排桩桩前土压力在滑面以下某处土压力达到最大,呈梯形分布;双排抗滑桩桩身弯矩整体呈“S”形分布;双排抗滑桩的破坏模式为双铰破坏。研究结果为双排抗滑桩技术推广提供了理论依据。Loess slopes are water-sensitive,the sliding surface is deep and arc-shaped,and the landslide thrust is large.Compared with traditional single-row anti-slide piles,double-row anti-slide piles can provide greater anti-sliding force and have certain advantages in the treatment of loess landslides.Through model tests and theoretical analysis,this study studies the stress,deformation,and failure processes of double-row anti-slide piles.It discovers that parallel coupling beam double-row anti-slide piles can increase the anti-sliding force by nearly two times,compared with single-row anti-slide piles;plum blossom coupling beam double-row anti-slide piles can increase the anti-sliding force by more than two times.It reveals the distribution law of front and rear piles of the double-row anti-slide piles to the landslide thrust in the loess landslide.The earth pressure behind the double-row anti-slide piles distributes along with the entire pile and reaches its maximum somewhere above the sliding surface.The earth pressure shows a trapezoidal distribution above the sliding surface and a rectangular distribution below the sliding surface.The earth pressure in front of the double-row anti-slide piles almost distributes along the entire pile body and reaches its maximum somewhere below the sliding surface.With small loads,the bending moment diagram of single-row anti-slide piles uniformly distributes.with increasing the load,the bending moment distributes in a triangular shape,with its maximum bending moment located near the sliding surface.The bending moment of double-row anti-slide piles distributes in an“S”shape.The maximum bending moment of the rear anti-slide piles is larger than that of the front anti-slide piles,and the maximum bending moment is located near the 1/4 pile length from the sliding surface.It clarifies the deformation failure mode of double-row anti-slide piles.The failure of single-row anti-slide piles is in brittle bend.The pile body is straight above and below the crack,and the final failure form

关 键 词：安全工程 黄土滑坡 双排抗滑桩 模型试验 

分 类 号：X43[环境科学与工程—灾害防治]