摘要
针对一种新型围桩-土耦合式抗滑结构,建立室内模型试验,采用应力、应变等测试手段,研究结构的加固滑坡工作机制.结果表明:黏性土介质为主滑坡体中,采用4倍围桩桩径作为围桩间距,呈正六边形布置,桩顶圈梁连接构成耦合结构,锚固深度为桩长的2/5时,在滑坡推力作用下,结构整体能够发挥较好的耦合效应,即桩土形成复合体,各围桩桩后的滑坡推力在滑面以上呈抛物线分布,在滑面以上约桩长10%附近出现最大值,滑面以下呈倒三角形分布,各围桩桩前的滑床抗力在滑面以上呈倒三角形分布,且在桩顶处出现最大值,在滑面以下呈正三角形分布,在滑动面处为最小值;各围桩的桩身最大弯矩位于滑动面以上10%桩长处,滑动面上、下圴呈抛物线分布;滑体中的土压力沿滑动方向不断减小,在桩位处土压力基本不变.其研究成果为建立这种新型抗滑结构的设计理论提供依据.
According to a new type of surrounding pile-soil coupling anti-slide structure,the indoor model tests were carried out.Using stress and strain testing tools,the work mechanism about structure strengthening landslide was studied.The coupling structure has a 4 times pile diameter as pile spacing,and hexagon shape,and adjacent piles with ring beam;the anchoring depth is 2/5 pile length in the clay landslide;under the effect of landslide thrust,the structure can play a better coupling effects,namely pile and soil can form a complex.Thrusting force after the surrounding pile has a parabola distribution above sliding surface;and it has inverted triangle distribution below sliding surface.The resistance of sliding bed before the surrounding piles distributes as inverted triangle above sliding face and equilateral triangle below sliding face;the maximum value is located in the top of the pile and the minimum value is located in the slide surface.Bending moment of surrounding piles distributes as parabolic above and below sliding surfaces： the maximum value is located at 10% pile length above sliding surface.Soil pressure is continuously reduced along the direction of sliding in slide body and in pile location is essentially unchanged.The research results will provide a basis for establishing design theory of new type of anti-slide structures.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2013年第4期494-498,518,共6页
Engineering Journal of Wuhan University
基金
国家自然科学基金资助项目(编号:51068006)
南通纺织职业技术学院科研项目(编号:FYKY/2013/20)
关键词
桩土耦合
滑坡
土压力
室内试验
pile-soil coupling
landslide
earth pressure
indoor model test
