单个围桩-土耦合抗滑结构的土压力试验分析  

Experimental study on earth pressure of single surround pile-soil coupled anti-slide structure

作　　者：刘伟宏[1,2] 郑明新[1] 王虹[2] 孔祥营[1] 

机构地区：[1]华东交通大学岩土与道桥工程研究所,江西南昌330013 [2]江西理工大学南昌校区建筑与资源工程系,江西南昌330013

出　　处：《河北农业大学学报》2012年第1期89-93,共5页Journal of Hebei Agricultural University

基　　金：国家自然科学基金资助项目<新型围桩-土耦合式抗滑桩作用机理与计算方法研究>(51068006);江西理工大学科研基金项目计划(jxxj11184)

摘　　要：针对新型桩-土耦合抗滑结构的工作机理研究,通过常规室内模型试验,采用土压力盒等应力测试手段,分析耦合结构中各围桩在滑体中的应力变化。结果表明:黏性土滑坡体中,采用围桩间距为4倍桩径,呈正六边形布置的耦合结构,锚固深度为桩长的2/5,在滑坡推力作用下,抗滑段内各围桩后土压力近似呈抛物线分布,在滑面以上约桩长的10%附近出现最大值。各围桩与桩中土压力值大致相等,围桩与桩间土体能够形成桩土耦合体共同来抵抗外荷载。锚固段内土压力值普遍较小,大致呈三角形分布,为讨论这种耦合结构的计算理论提供依据。To examine the coupled anti-slide structure of surround pile-soil＇s working mecha- nism, normal indoor model test and stress testing by soil pressure box are used to analyze the stress change on coupling structure of each surrounding pile in landslide. Results show that incohesive soil landslide, using the surrounding pile spacing is 4 times the pile diameter, hexa- gonal arrangement coupled structure, anchorage depth of pile length 2/5, anti-slide pile earth pressure behind the surround pile is approximately parabolic distribution in the landslidethrust, on the surface above the pile length of 10% occur maximum, soil stress value approxi- mately equal at surrounding pile and in the middle of structure, between pile and around pile soil can form pile-soil coupling body to resist external load, anchoring inner soil pressure val-ue is generally small, with roughly triangular distribution. It is hoped that paper can provide the basis for this coupling pile-soil structure calculation theory.

关 键 词：耦合抗滑结构 滑坡 土压力 试验 

分 类 号：TV223.2[水利工程—水工结构工程]