合肥地铁车站基坑膨胀土有荷条件下的变形规律研究
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摘要
为了考察合肥地区膨胀土的膨胀特性,选取合肥地铁车站基坑膨胀土进行了击实土样的有荷膨胀率试验,研究膨胀土的膨胀时程曲线特征及其有荷膨胀率与初始含水率、压实度、荷载的关系。试验结果表明:有荷膨胀时程曲线可分为等速膨胀、减速膨胀、缓慢膨胀阶段,初始条件不同膨胀时程曲线特征也不同;有荷膨胀率随初始含水率的增加而线性降低,有荷膨胀率与荷载的对数呈线性关系;压实度对有荷膨胀率的影响不显著。
In order to investigate the swelling properties of expansive soil in H efei,the loading swelling ratio experiments of compacted soil in foundation pit of H efei subway station were carried out. The expansion time curve characteristics of expansive soil and the relationship between loading swelling ratio and initial moisture content,compaction degree and loading were analyzed. The results showed that the loading expansion time curve can be divided into such three phases as constant expansion,descending expansion and slowexpansion,the expansion time curve characteristics are different under different initial conditions,loading swelling ratio decreases linearly with the initial moisture content increasing,there is a linear relationship between the loading swelling ratio and loading logarithm,and the influence of the compaction degree on the loading swelling ratio is not significant.
In order to investigate the swelling properties of expansive soil in H efei,the loading swelling ratio experiments of compacted soil in foundation pit of H efei subway station were carried out. The expansion time curve characteristics of expansive soil and the relationship between loading swelling ratio and initial moisture content,compaction degree and loading were analyzed. The results showed that the loading expansion time curve can be divided into such three phases as constant expansion,descending expansion and slowexpansion,the expansion time curve characteristics are different under different initial conditions,loading swelling ratio decreases linearly with the initial moisture content increasing,there is a linear relationship between the loading swelling ratio and loading logarithm,and the influence of the compaction degree on the loading swelling ratio is not significant.
引文
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[2]胡瑾,王保田,张文慧,等.无荷和有荷条件下膨胀土变形规律研究[J].岩土工程学报,2011,31(增1):335-338.
[3]袁俊平,陈剑.膨胀土单向浸水膨胀时程特性试验与应用研究[J].河海大学学报(自然科学版),2003,31(5):547-551.
[4]徐永福,史春乐.宁夏膨胀土的膨胀变形规律[J].岩土工程学报,1997,19(3):95-98.
[5]黄华县,张春顺.膨胀土膨胀变形时程特性研究[J].湖南工业大学学报,2009,23(4):6-10.
[6]陈善雄,李伏保,孔令伟.弱膨胀土工程特性及其路基处治对策[J].岩土力学,2006,27(3):353-359.
[7]黄斌,饶锡保,王章琼,等.考虑状态含水率和密度的膨胀土膨胀模型试验研究[J].岩土力学,2011,32(增1):397-402.
[8]李献民,王永和,杨果林,等.击实膨胀土工程变形特征的试验研究[J].岩土力学,2003,24(5):826-830.
[9]章李坚,郭永春,代聪.含水率对膨胀土胀缩性能影响的试验研究[J].工程地质学报,2012,20(增):108-112.
[10]饶锡保,黄斌,吴云刚,等.膨胀土击实样膨胀特性试验研究[J].武汉大学学报,2011,44(2):211-215.
[11]张爱军,哈岸英,骆亚生.压实膨胀土的膨胀变形规律与计算模式[J].岩石力学与工程学报,2005,24(7):1236-1241.
[12]饶平平,李镜培.合肥城市地下空间开发中的若干问题分析[J].地下空间与工程学报,2010,6(3):444-448.
[13]中华人民共和国交通部.GB/T 50145—2007土的工程分类标准[S].北京:人民交通出版社,2007.
[14]中华人民共和国水利部.SL237-002—1999土工试验规程[S].北京:中国水利水电出版社,1999.
[15]BOLT G H.Physico-Chemical Analysis of the Compressibility of Pure Clays[J].Geotechnique,1956,6(2):86-93.
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