基于沉管挤密法的湿陷性黄土地基加固效果分析  

Analysis of reinforcement effect of collapsible loess foundation based on immersed pipe compaction method

作　　者：何子苗 薛鹏 李松徽 He Zimiao;Xue Peng;Li Songhui(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730072

出　　处：《山西建筑》2021年第3期54-56,共3页Shanxi Architecture

摘　　要：根据现场实测的沉管挤密桩地基处理技术试验数据,采用MIDAS/GTS对处理的复合地基进行数值模拟,计算出不同受力与不同桩间距变量下的沉管挤密桩的受力与沉降情况。从而得到了桩体位移的衰减规律,判定沉管挤密桩的影响范围为3倍的桩间距。桩身的上半部分承担了复合地基的大部分荷载及刚度变化,具体集中在上部1/3区域处。在同一桩身深度时,桩身沉降量均随加载值增大而增大,桩间距相对较大时,其沉降比也会相对变大,且桩间距越大其沉降量变化趋势越趋近于线性增大。According to the field test data of immersed tube compact pile foundation treatment technology,MIDAS/GTS is used to simulate the treated composite foundation,and the stress and settlement of immersed tube compaction pile under different forces and different pile spacing variables are calculated.The results show that:the load and stiffness of composite foundation are mainly borne by the upper part of pile 1/3 area.At the same pile depth,the settlement ratio increases with the increase of top load,and the settlement ratio of large pile spacing is greater than that of small pile spacing;the pile spacing in pile group foundation has certain influence on the settlement ratio of pile cap top.The attenuation law of pile displacement is obtained,and the influence range of immersed tube compaction pile is 3 times of pile spacing.

关 键 词：沉管挤密桩 沉降 桩间距 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]