高压旋喷桩复合地基承载力研究  

Bearing Capacity of Composite Foundation of High Pressure Jet Grouting Pile

作　　者：贾剑青[1] 刘杰 赖远明 李明正 JIA Jianqing;LIU Jie;LAI Yuanming;LI Mingzheng(School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou Gansu 730000, China;Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou Gansu 730000, China;The 3rd Engineering Co., Ltd., China Railway 17th Bureau Group Co., Ltd., Shijiazhuang Hebei 050227, China)

机构地区：[1]兰州交通大学交通运输学院,甘肃兰州730000 [2]中国科学院西北生态环境资源研究院,甘肃兰州730000 [3]中铁十七局集团有限公司第三工程有限公司,河北石家庄050227

出　　处：《中国铁道科学》2018年第6期1-7,共7页China Railway Science

基　　金：国家自然科学基金资助项目(51104081);甘肃省自然科学基金资助项目(1508RJZA106);甘肃省高等学校科研项目(2015A-058);兰州交通大学'百名青年优秀人才培养计划'基金资助

摘　　要：以某铁路枢纽西南环线铁路路基为背景,运用高压旋喷桩桩体低应变动态测试试验、抽芯检测及单桩复合地基承载力静载荷试验,以及理论计算和数值分析,研究高压旋喷桩复合地基承载力。结果表明:该路基的356根高压旋喷桩中,一类桩占95.5%,二类桩占4.5%,桩体强度均大于1.6MPa;现场试验所得单桩复合地基承载力特征值为169~181kPa,理论计算所得特征值为248.7kPa,表明当现场加载未达到极限状态时,所得复合地基承载力特征值偏小;数值模拟所得单桩复合地基承载力为155kPa,其荷载—沉降曲线变化趋势与现场试验结果相同;该复合地基成桩质量及承载力能够满足工程设计要求。Taking the subgrade of the southwest loop line of a railway hub as the background,the bearing capacity of the composite foundation of high pressure jet grouting pile was studied by using the low strain dynamic test,core pulling test,the static load test of the bearing capacity of single pile composite foundation as well as the theoretical calculation and numerical analysis.Results show that,in the356high pressure jet grouting piles,the first and second class piles account for95.5%and4.5%respectively,and the strengths of all piles are greater than1.6MPa.The eigenvalue for the bearing capacity of single pile composite foundation obtained from field test is169~181kPa,and the theoretically calculated eigenvalue is248.7kPa,which indicates that when the field loading does not reach the limit state,the eigenvalue for the bearing capacity of composite foundation obtained from field test is smaller than the actual value.The bearing capacity of single pile composite foundation obtained by numerical simulation is155kPa,and the change trend of load-settlement curve is the same as the field test result.The pile quality and bearing capacity of this composite foundation can meet engineering design requirements.

关 键 词：铁路路基 高压旋喷桩 复合地基 承载力 加固 

分 类 号：TU473[建筑科学—结构工程]