高速铁路中低压缩性土物理力学特性试验研究

发布时间：2018-01-02 10:28

本文关键词：高速铁路中低压缩性土物理力学特性试验研究　出处：《土木工程学报》2015年S2期 　论文类型：期刊论文

【摘要】：选取宁安客运专线安庆试验工点典型中低压缩性土原状土试样为研究对象,进行了一系列的室内土工试验。对中低压缩性土的物理力学指标进行了统计分析,探讨了物理指标之间的相关性及土性分布模型。通过开展高压固结试验、长期压缩试验和三轴试验,研究了中低压缩性土的超固结特性和长期压缩特性,探讨了黏土结构性对中低压缩性土力学特性的影响。试验结果表明:部分物理指标之间可建立较好的相关性;土性指标主要集中在分布区间的前半段;先期固结压力大,超固结特性显著,在小于先期固结压力的再加载压力作用下以弹性变形为主;长期压缩试验中主固结比例大,变形较快趋于稳定;原状土试样的饱和-固结过程可以显著降低结构性对土体强度的影响。
[Abstract]:Select Ning Anqing passenger line test points, the typical low soil compressibility of undisturbed soil samples as the research object, the indoor soil test. A series of physical and mechanical indexes of low compressibility of soil are analyzed, and the correlations between soil physical distribution model between the indexes. Through the development of high pressure consolidation test, long-term compression three test and triaxial test, studied the property of low overconsolidated soil compression and long-term compression properties, discussed the influence of clay structure on mechanical properties of low compressibility soil. The experimental results show that some physical indicators can establish a good correlation; soil index mainly concentrated in the distribution range of the first half in advance; consolidation pressure, consolidation properties significantly, mainly in less than the preconsolidation pressure and load pressure by elastic deformation; long-term primary consolidation test in a large proportion of variable The shape of the original soil tends to be stable, and the saturated consolidation process of the specimen of the original soil can significantly reduce the influence of the structure on the strength of the soil.

【作者单位】：华中科技大学;中铁第四勘察设计院集团有限公司;山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室;
【基金】：国家自然科学基金项目(51278216) 铁四院科技研究开发计划课题(2010K29-1,2013K24-1)
【分类号】：TU41
【正文快照】： 3.山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,山西太原030006)引言近年来,高速铁路网建设在我国大规模展开,路基工程作为高速铁路工程的重要组成部分,是制约列车能否高速、安全和舒适运行的关键。《高速铁路设计规范(试行)》(TB 10621—2009)要求无

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