微型组合抗滑桩力学特性模型试验  

A model test of the mechanical characteristics of the micro-pile combined structure

作　　者：李乾坤[1] 石胜伟[1] 韩新强[1] 蔡强[1] 

机构地区：[1]中国地质调查局地质灾害防治技术中心,中国地质科学院探矿工艺研究所,成都611734

出　　处：《兰州大学学报（自然科学版）》2015年第6期841-844,共4页Journal of Lanzhou University(Natural Sciences)

基　　金：中国地质调查局项目(1212011220170)

摘　　要：通过特定距径比条件下的微型组合抗滑桩室外模型试验，分析微型桩前后土压力和桩身弯矩，研究微型组合抗滑桩力学特性．结果表明当外部荷载加载至150kN时，桩前土压力骤减，桩土发生脱离，模型失稳破坏；桩体滑面以上1／3-4／2长度范围为主要受荷段，所受滑坡推力约为其余部分的2—3倍；靠近滑坡后缘的桩，最大弯矩出现在滑面附近，靠近前缘的桩，最大弯矩出现在滑面以上1／8—1／4长度范围内．提出了微型组合抗滑桩结构的一些设计建议．A model test was used to study the mechanical characteristics of the micro-pile combined structure with a specific distance-diameter ratio. When the load was increased to 150 kN, the soil pressure decreased greatly, indicating that the model failed and the soil broke away from the piles; the main bearing part was 1/3 to 1/2 Of the micro-pile above the slide surface, and the magnitude of load was about twice as much as the other part of the micro-pile. In a different row, the position of the maximum bending moment was different near the back of the model, the maximum bending moment position was near the slide surface and, in front of the model, the maximum bending moment appeared at the pile above sliding surface 1/8-1/4 length range. Some advice for the design of the micro-pile combined structure were suggested.

关 键 词：微型组合抗滑桩 物理模型试验 力学特性 距径比 

分 类 号：P642[天文地球—工程地质学] TU42[天文地球—地质矿产勘探]