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工程力学  2013 

强结构性对湛江黏土地区CPTU原位测定结果的影响

DOI: 10.6052/j.issn.1000-4750.2011.07.0447, PP. 118-124

Keywords: 湛江黏土,强结构性,孔压静力触探,孔隙水压力,固结系数

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Abstract:

为了评价土的结构性对黏性土地区CPTU测试结果的影响。对湛江地区黏土(层)进行室内固结试验和CPTU原位试验,获得孔压静力触探响应特征,对比分析室内试验与CPTU测试结果求取固结系数的差异性。结果表明:湛江黏土的触探指标较高,qc=(2.5~3.0)MPa,Rf平均值约为1%;在强结构性黏土地区利用CPTU测定结果划分土层具有较高的准确性;受强结构性影响,土的埋深越大,CPTU的孔压消散时间越短,土的固结系数越大;浅层土试验孔压消散初期土体出现剪胀现象;利用室内试验得到湛江黏土在结构破坏前的固结系数Cv是重塑土的固结系数Cv的10倍左右;贯入过程中由于结构的破损会使探头周围土体的渗透性迅速降低出现指标失真,导致基于CPTU测试得到原状土的固结系数远小于室内试验结果;最后,考虑结构性,根据CPTU资料提出一个可用于估算结构性黏土固结系数的方法,该研究为准确获得结构性黏土地基处理设计参数提供了合理的科学依据。

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