摘要
概述了西安地裂缝的成因、分布规律和活动速率等特征,然后对某条地裂缝特定地段附近的Q3黄土及其下面第一层古土壤进行了原状土样的常规土工试验和重塑土样的三轴流变试验。常规土工试验表明,以地裂缝为中心,越靠近地裂缝土样的天然密度、含水量、液塑限越大,孔隙比、内聚力和内摩擦角越小,均以地裂缝为中心近乎呈对称分布。重塑土样的三轴流变试验表明,地裂缝带内土的三轴流变特性较地裂缝附近黄土的流变特性明显的多。这从另一角度证明了地裂缝为一宏观不连续软弱结构面,为从力学角度研究地裂缝对工程结构的影响分析研究提供参考。
The origin and distribution character and activity rate of ground fissure in Xi＇an is represented.Furthermore,the natural soil sample of Q3 loess and its first buried fossil soil near and within a ground fissure are sampled.The routine soil mechanics test of natural soil sample and the triaxial rheological test of remoulded soil sample are accomplished.The indoor test result shows that the natural density,moisture content,liquid limit and plastic limit become higher near the ground fissure,but the porosity ratio,cohesive force,internal friction angle become lower near the ground fissure,which all is nearly symmetric to the ground fissure.The triaxial rheological test of remoulded soil sample shows that the rheological character of the ground fissure soil is more explicit than that of the loess near the ground fissure.The experimental study shows that the physical and mechanical properties of soil near and within ground fissure are very different.Therefore,the ground fissure is a discontinuous week structural plane in the soil.The laboratory test has valuable reference to the influence analysis study of ground fissure on the engineering structure from the viewpoint of mechanics.
出处
《地球科学与环境学报》
CAS
2009年第1期85-88,共4页
Journal of Earth Sciences and Environment
基金
国家自然科学基金项目(40602033)
关键词
地裂缝
试验研究
黄土
物理力学性质
ground fissure
experimental study
loess
physical mechanic property
