双向螺旋素土挤土桩处理深厚自重湿陷性黄土地基的试验研究  

EXPERIMENTAL STUDY OF TREATMENT FOR DEEP THICKNESS SELF-WEIGHT COLLAPSIBLE LOESS FOUNDATION WITH TWO-WAY SOIL DISPLACEMENT SCREW PILES

作　　者：陈天镭 李旭东 高玉广 CHEN Tianlei;LI Xudong;GAO Yuguang(Lanzhou Engineering&Research Institute of Nonferrous Metallurgy Co.,Ltd.,Lanzhou 730000,China;Gansu Civil Engineering Research Institute Co.,Ltd.,Lanzhou 730020,China)

机构地区：[1]兰州有色冶金设计研究院有限公司,兰州730000 [2]甘肃土木工程科学研究院有限公司,兰州730020

出　　处：《工业建筑》2020年第6期1-5,28,共6页Industrial Construction

基　　金：甘肃省科技计划资助项目(18YF1GA055)。

摘　　要：为论证双向螺旋素土挤土桩消除自重湿陷性黄土地基湿陷性的可行性,在兰州黄河南岸高阶深厚自重湿陷性黄土场地上开展了双向螺旋素土挤土桩单桩和群桩的挤土试验,测得双向螺旋素土挤土桩单桩周围土体的变形以及距桩周不同距离处土体物理力学指标的变化;获得不同桩间距的双向螺旋素土挤土桩群桩桩间土物理力学指标变化以及桩间土承载力的变化情况。试验表明:经双向螺旋素土挤土桩单桩挤密后的土层土性变化最大范围为2倍桩间距,明显影响范围为1.0~1.5倍桩间距;群桩间距不大于2.5倍桩间距时,双向螺旋素土挤土桩可以消除黄土湿陷性。In order to demonstrate the feasibility of eliminating foundation collapasibility for the two-way soil displacement screw pile(SDS pile)on self-weight collapsible loess,the compaction test of the single and group pile were carried out on the site of high-order deep thickness self-weight collapsible loess on the south coast of the Yellow River in Lanzhou.The deformation of soil around the single pile and the changes of physical and mechanical indexes of soil at different distances from the pile were measured;the changes of the physical and mechanical indexes and the bearing capacity of the soil among piles were measured.The research showed that the variable maximum range of soil properties treated by the SDS pile was in 2 times pile’s diameter,the obvious influence range was 1.0 to 1.5 times pile’s diameter;when the distance between piles was not more than 2.5 times diameter.The SDS pile could eliminate the collapsibility of the loess.

关 键 词：双向螺旋素土挤土桩 大厚度自重湿陷性黄土 地基处理 挤土法 

分 类 号：TU475.3[建筑科学—结构工程] TU473.1[建筑科学—土工工程]