西南山区沟谷型软土工程特性及沉降规律  

Engineering characteristics and settlement rules of gully soft clay in mountainous areas of Southwest China

作　　者：陈继彬[1,2] 赵其华[1,2] 彭社琴[1,2] 陈子扬[1,2] 

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),四川成都610059 [2]成都理工大学环境与土木工程学院,四川成都610059

出　　处：《岩土工程学报》2013年第S2期945-950,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展计划(2011CB013501);长江学者和创新团队发展计划(IRT0812)

摘　　要：对区域性软土的工程特性及沉降规律的研究,在高速公路的建设中具有重要的现实意义。在大量土工试验的基础上,结合四川省遂—资高速公路软基变形监测数据,系统分析山区沟谷型软土工程特性,并总结软基沉降变形规律,主要结论如下:①软土分布均匀,主要为高、低液限黏土,软土物理力学指标较我国部分沿海地区低,而力学指标要高;②主要物理力学指标有较好的线性相关性,可用于软土物理力学参数的预测和控制;③固结系数随应力增大表现为非线性–线性降低的趋势。软土蠕变是非线性的,与时间相关,依据蠕变曲线的3种形态可对主次固结进行划分;④在数据分析的基础上给出了塑料排水板、碎石桩处理后,软土层厚度与沉降量在不同填高情况下的数学关系式。It is of great practical significance to study the engineering characteristics and settlement rules of soft ground. Based on the laboratory test results and observed data of settlement deformation of soft ground of Suining-Ziyang expressway in Sichuan Province, the engineering characteristics and settlement rules are analyzed. Some conclusions are drawn as follows:(1) the soft clay is uniformly distributed composed of high- and low-liquid limit clay. Its physical parameters are lower than those in part of the coastal areas of China, but its mechanical parameters are higher;(2) the main physical and mechanical parameters of the soft clay have a linear correlation. According to the correlation, the physical and mechanical parameters can be forecasted and controlled;(3) the consolidation coefficient has a nolinear to linear decrease as the stress increases. The creep of the soft clay is nonlinear and time-dependent. There are three types of creep curves, and thus the primary and secondary compressions can be distinguished;(4) the mathematical relationships between the settlement and the thickness of the soft clay are proposed based on the observated data of soft soil subgrade treated by plastic drainage plates and stone columns.

关 键 词：西南山区 沟谷型软土 工程特性 沉降规律 

分 类 号：U416.1[交通运输工程—道路与铁道工程]