钢管抗滑短桩受力特性物理模型试验研究

doi:10.16285/j.rsm.2016.S2.086

›› 2016, Vol. 37 ›› Issue (S2): 679-684.doi: 10.16285/j.rsm.2016.S2.086

钢管抗滑短桩受力特性物理模型试验研究

蔡强^{1, 2}，李乾坤^{1, 2}，石胜伟^{1, 2}，张勇^{1, 2}

1. 中国地质调查局地质灾害防治技术中心，四川成都 611734；2. 中国地质科学院探矿工艺研究所，四川成都 611734

收稿日期:2016-03-22 出版日期:2016-11-11 发布日期:2018-06-09
作者简介:蔡强，男，1982年生，博士，高级工程师，主要从事地质灾害机理及防治技术研究方面的工作。
基金资助:
国土资源部公益性行业专项（No.201511051）

Study of mechanical characteristics of short anti-sliding steel pipe pile by physical model test

CAI Qiang^{1, 2}, LI Qian-kun^{1, 2}, SHI Sheng-wei^{1, 2}, ZHANG Yong^{1, 2}

1.Technical Center for Geological Hazard Prevention and Control, China Geological Survey, Chengdu, Sichuan 611734, China; 2. Institute of Exploration Technology, Chinese Academy of Geological Sciences, Chengdu, Sichuan 611734, China

Received:2016-03-22 Online:2016-11-11 Published:2018-06-09
Supported by:
This work was supported by the Specific Public Service Industry (201511051).

摘要/Abstract

摘要： 为研究钢管抗滑短桩加固滑坡体的受力特性，在中国地质调查局地质灾害防治技术中心完成了4组不同桩长的钢管抗滑短桩加固碎石土滑坡的室内物理模型试验。测试堆载施加的滑坡推力作用下桩后、前土压力和桩身应变，观察滑体前缘变形破坏形态，分析滑坡推力、桩前土体抗力和桩身弯矩的分布规律试验。结果表明，滑坡推力的分布和桩前土体抗力和桩身弯矩是“S”型分布，确定了抗滑短桩的危险截面。对比分析桩长变化钢管抗滑短桩的受力特性，初步拟定钢管短桩能发挥抗滑效果的桩长下限值，即钢管抗滑短桩位于滑体中的长度应不小于滑体厚度的2/3。

关键词: 钢管抗滑短桩, 堆载, 滑坡推力, 土体抗力, 桩身弯矩, 桩长下限值, 物理模型试验

Abstract: In order to study the mechanical characteristics of short anti-sliding steel pipe pile for stabilizing the slope, four groups indoor physical model tests of short anti-slide steel pipe pile for reinforcing debris landslide with different lengths are conducted in the geological disaster prevention technology center completion of China Geological Survey. Through measuring the soil pressure at the rear and fore of short anti-slide steel pipe pile with stress-strain sensors as the sliding force impelled by the heaped load, observing the deformation and failure of the leading edge of landslide in the whole experimental process, analyzing the distribution of landslide thrust, soil resistance at the fore of steel pipe pile and bending moment of short anti-slide steel pipe pile. The results show that the distribution of landslide thrust and soil resistance at the fore of steel pipe pile are triangular-quadrilateral, bending moment is S-shaped distribution; the maximum bending moment and the critical section of short anti-slide steel pipe pile which are located at the vicinity of the sliding surface. And comparative analysis of mechanical characteristics of short anti-slide steel pipe pile with length changing , the limit length value of short anti-sliding steel pipe pile can be developed which totally play the anti-sliding effect; that the length of short anti-slide steel pipe pile should be not less than 2/3 of the slip thickness.

Key words: short anti-sliding steel pipe pile, heaped load, landslide thrust, soil resistance, pile bending moment, limit length value of pile, physical model test

中图分类号:

TU 473

蔡强，李乾坤，石胜伟，张勇, . 钢管抗滑短桩受力特性物理模型试验研究[J]. , 2016, 37(S2): 679-684.

CAI Qiang, LI Qian-kun, SHI Sheng-wei, ZHANG Yong, . Study of mechanical characteristics of short anti-sliding steel pipe pile by physical model test [J]. , 2016, 37(S2): 679-684.

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钢管抗滑短桩受力特性物理模型试验研究

Study of mechanical characteristics of short anti-sliding steel pipe pile by physical model test

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