大西客专湿陷性黄土的大型浸水试验和路基处理方案研究  

WATER IMMERSION TEST AT COLLAPSIBLE LOESS AREA OF DATONG-XI’AN HIGH-SPEED RAILWAY AND ITS SUBGRADE TREATMENT SCHEME

作　　者：康宁 罗奇斌[3] 郭乐 付新平 朱亮[5] KANG Ning;LUO Qibin;GUO Le;FU Xinping;ZHU Liang(China University of Mining and Technology (Beijing),Beijing 100083,China;National Engineering Research Center of Coal Mine Water Hazard Control,Beijing 100083,China;National Continental Dynamics Key Laboratories of Northwest University,Xi'an 710069,China;China Railway Design Group Co.,Ltd.,Tianjin 300142,China;Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China)

机构地区：[1]中国矿业大学(北京),北京100083 [2]国家煤矿水害防治工程技术研究中心,北京100083 [3]西北大学大陆动力学国家重点实验室,西安710069 [4]中国铁路设计集团有限公司,天津300142 [5]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《工业建筑》2018年第12期115-119,共5页Industrial Construction

基　　金：中国地质调查局项目(DD20160308);国家自然科学基金资助项目(41430318,41572222,41877186,41602262,41702261);国家重点研发计划项目(2016YFC0801800)

摘　　要：依托大西客专工程建设及其科研项目,通过在山西运城典型湿陷性黄土地区进行的现场大型试坑浸水试验,对浸水试坑的沉降变形特性、浸水变形的时间特性、基质吸力特性等做了较为深入的分析研究。试验表明:湿陷性黄土趋近饱和时,基质吸力基本消失,土压力降至最低,土体结构极易产生破坏而发生“突发性”湿陷。依据浸水试验实测最大自重湿陷量,获得了地区自重湿陷量的修正系数β0值。本次湿陷性黄土场地原位试验获得的数据与参数已应用于大西客专路基设计,其成果对湿陷性黄土区的各类工程建筑有一定的参考及借鉴价值。Based on the construction and research project of Datong-Xi* an High-speed Railway, the paper analyzed closely the settlement deformation characteristics of the immersion test excavation pit, the time characteristics of immersion deformation, and the matric suction characteristics, by conducting large scale on-site water immersion test at the collapsible loess area in Yuncheng, Shanxi Province. The results showed that when the collapsible loess was saturated by water, the matrix suction was almost disappeared, the soil pressure was reduced to the minimum, and the soil structure was easily damaged, resulting in “sudden” collapse. Moreover, the correction coefficient /3() of collapse under overburden pressure in the area was obtained, according lo the maximum collapse under overburden pressure measured during the immersion test. The data and parameters obtained from the in-situ test of the collapsible loess site were applied to the design of the roadbed of Datong-Xi' an High-speed Railway. The results of the paper were based on these data and parameters, and were valuable for future constructions at the collapsible loess area.

关 键 词：大西客专 湿陷性黄土 浸水试验 沉降变形 路基处理 

分 类 号：U213.1[交通运输工程—道路与铁道工程]