不同截面形态的空心抗滑桩支挡效果对比研究  

A comparative study of the retaining effect of hollow pile in different sections

作　　者：易靖松 张世林 孙金辉 鲜杰良 蔡佳君 YI Jingsong;ZHANG Shilin;SUN Jinhui;XIAN Jieliang;CAI Jiajun(Institute of Exploration Technology,CAGS/Technical Center for Geological Hazard Prevention and Control,CGS,Chengdu,Sichuan 611734,China)

机构地区：[1]中国地质科学院探矿工艺研究所/中国地质调查局地质灾害防治技术中心,四川成都611734

出　　处：《水文地质工程地质》2018年第5期121-128,135,共9页Hydrogeology & Engineering Geology

基　　金：中国地质调查局公益项目(大巴山区城镇地质灾害调查;DD20160278)

摘　　要：为了研究矩形截面空心桩和圆形截面空心桩的支挡效果及破坏模式,文章利用压力盒、应变片、钢筋计等传感器装置,开展室内模型试验。研究表明:矩形截面空心桩和圆形截面空心桩桩身最大弯矩分布在滑面上下约5 cm处,分布范围约占桩体自由段长度的1/4~1/2;空心桩桩身集水孔的布置会导致桩体承载能力有所降低,交错布置集水孔时,承载力约降低10%,竖排直线布置承载力约降低25%;圆形截面空心桩破坏时表现为沿滑面受剪破坏,而矩形截面空心桩表现为受压破坏。结果显示矩形截面空心桩的承载能力和抗弯能力优于圆形截面空心桩,在空心抗滑桩设计中应加强桩底至滑面以上1/2范围内的结构配筋,空心桩集水孔宜采用交错布置。Based on indoor model tests,the pressure box,strain gauge and reinforcement sensor are used to examine the retaining effect and failure mode of a rectangular hollow pile and a circular cross section hollow pile.The research results show that(1)the maximum bending moment of the rectangular hollow pile and the circular hollow pile occurs about 5 cm above and below the surface,with the distribution range of about 1/4 to 1/2 of the pile length of the free segment.It is suggested that the structural reinforcement in the 1/2 range above the pile bottom to the sliding surface should be strengthened in the design.(2)The bearing capacity and bending resistance of rectangular cross section hollow pile are better than that of circular cross section hollow pile.(3)The arrangement of the water hole will lead to the reduction of the bearing capacity of the pile,and water collecting holes should be arranged in the staggered arrangement.(4)The circular cross section hollow pile is subjected to shear failure along the sliding surface,while the rectangular hollow pile is subjected to compression failure.

关 键 词：抗滑桩 空心桩 弯矩 集水孔 截面形态 

分 类 号：P642.22[天文地球—工程地质学] U216.419.1[天文地球—地质矿产勘探]