大厚度夯填黄土场地工后变形特性研究  

Study on post-construction deformation characteristics of thick compacted loess site

作　　者：杨勇[1,2] 范文 徐张建[2] 张海峰 赵治海 Yang Yong;Fan Wen;Xu Zhangjian;Zhang Haifeng;Zhao Zhihai(Chang'an University,Xi'an 710054,China;Northwest Research Institute of Engineering Investigation and Design,Xi'an 710003,China)

机构地区：[1]长安大学,陕西西安710054 [2]西北综合勘察设计研究院,陕西西安710003

出　　处：《土木工程学报》2023年第6期117-125,共9页China Civil Engineering Journal

摘　　要：以陕北某黄土沟壑区高填方黄土场地为例,利用多重监测手段对填方体进行了长期、连续的变形监测,利用监测成果分别研究了夯填黄土场地地表和深部的沉降变形及水平位移变形特性。对影响沉降变形的压缩层厚度因素及时间因素进行分析,建立多因素沉降变形回归模型,讨论了以沉降变形速率作为稳定标准,不同填方厚度条件下的填方体沉降变形稳定时间。分析表明:分层强夯回填黄土场地的最终工后沉降量约为压缩层厚度的1.29‰,填方体的地表水平位移量较沉降变形量小,地表水平位移变形在方向上指向填方体临空面方向或填土厚度较大部位方向;在深层变形特性上,填方体表现出表层回弹、深部压缩的变形特性,填方体的深层水平位移表现出呈随深度减小的趋势。Taking a thick compacted loess site in gully area in Northern Shaanxi as an example,the long-term and continuous deformation monitoring of the filling body is carried out by using multiple monitoring means.Based on the monitoring results,the characteristics of settlement deformation and horizontal displacement deformation of compacted loess site near surface and in different depths are studied,respectively.The compression thickness factor and time factor affecting settlement deformation are analyzed,and a multi factor settlement deformation regression model is established.Taking the settlement deformation rate as the standard of settlement stability,the settlement stability time of fill with different thickness is discussed.The analysis results show that the final post construction settlement of the compacted loess site is about 1.29%o of the thickness,and the surface horizontal displacement of the filling body is smaller than that of the settlement.The surface horizontal deformation tends to point to the free face of the filling body or the position with large filling thickness.In terms of deep deformation characteristics,the filling body shows the deformation characteristics of surface rebound and deep compression.The deep horizontal displacement of the fill body decreases with the depth.

关 键 词：大厚度夯填黄土场地 工后沉降 水平位移变形 变形特性 

分 类 号：TU444[建筑科学—岩土工程]