基于超软土固结试验砂井大变形固结参数变化特性  

Study on variation characteristics of large-strain consolidation parameters for vertical drain based on consolidation test of ultra-soft soil

作　　者：张明 袁敏 王威[2] ZHANG Ming;YUAN Min;WANG Wei(College of Civil Engineering,Henan Institute of Engineering,Zhengzhou 451191,China;Institute of Earthquake Resistance and Disaster Reduction,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]河南工程学院土木工程学院,郑州451191 [2]北京工业大学抗震减灾研究所,北京100124

出　　处：《南水北调与水利科技》2017年第A02期162-168,172,共8页South-to-North Water Transfers and Water Science & Technology

基　　金：河南省高等学校青年骨干教师培养计划项目(2016GGJS-155);国家自然科学基金项目(51208017)

摘　　要：基于砂井轴对称大变形固结方程,定义了5类固结参数的表达式,考虑超软土渗透系数及有效应力与孔隙比之间的半对数和幂函数2类非线性关系,结合深圳湾海相淤泥及吹填淤泥的GDS固结仪固结渗透试验,分析砂井轴对称大变形固结方程固结参数的变化特征。结果表明:(1)吹填淤泥、海相淤泥的径向与竖向大变形固结系数随固结过程中孔隙比的减小变化规律复杂,单个试样变化幅度最大分别为十几倍与十倍;(2)吹填淤泥、海相淤泥的其他3类固结参数随固结过程中孔隙比的减小变化1~2个数量级,单个试样变化幅度最大达到几十倍。5类固结参数随固结过程中孔隙比的变化发生较大变化,大变形固结方程简化求解时不能看作常量处理。Based on the axisymmetric and large-strain consolidation equation of vertical drains ground,the expressions of five consolidation parameters are defined in this paper.In order to study the variation characteristics of consolidation parameters for axisymmetric large-strain consolidation of vertical drains ground,It is introduced that the coefficient of permeability-void ratio and effective stress-void ratio follow the semilogarithm and power function nonlinear relationship for ultra-soft soil,and consolidation and permeability tests of marine silt and dredged fill in Shenzhen Bay area by GDS consolidation apparatus are carried out.The obtained results verifies that:1)The variation rules of the radial and vertical large-strain coefficient of consolidation for dredged fill and marine silt are very complex with the decrease of the void ratio in Shenzhen Qianwan area,of which the variation for a single sample is separately more than ten times and ten times;2)Other three kinds of consolidation parameters for dredged fill and marine silt varied 1-2 orders of magnitude with the decrease of the void ratio,of which the maximum amplitude of variation for a single sample is several decuples times.The great change for five kinds of consolidation parameters with the decrease of the void ratio occur,and which can not be regarded as constant when the simplified solution to large-strain consolidation equation of vertical drains ground.

关 键 词：大变形 砂井 固结参数 超软土 GDS固结仪 固结渗透试验 

分 类 号：TU411[建筑科学—岩土工程]