玄武岩残积土综合原位测试与分析研究  

Study on in-situ comprehensive testing for the residual soil of basalt

作　　者：徐良[1] 柴寿喜[1] 魏厚振[2] 张瑞敏[1] 

机构地区：[1]天津城市建设学院天津市软土特性与工程环境重点实验室,天津300384 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《工程勘察》2012年第10期5-9,15,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(11072255);交通部西部交通建设项目(2009318802074)

摘　　要：受风化环境和成因的影响,未经水平运移的残积土结构性较强,扰动取样后的室内试验无法真实反映残积土的力学性能。在贵州玄武岩地区进行了原位旁压试验、动力触探和高密度电法试验,分析得到了残积土的原位力学参数的空间分布特征。试验结果表明:水平旁压模量EH与竖直旁压模量EV差值在15%左右,两方向的旁压模量相关性较好;该残积土边坡不同位置同一深度处力学参数差别较大;旁压试验所推算的旁压模量Em及地基承载力fk等参数在垂向上均随深度增加逐渐增大;通过高密度电法与旁压试验的对比,可在一定程度上了解残积土边坡力学参数的空间分布;将动力触探击数与旁压试验推算的地基承载力作对比,得出了该地区动力触探击数推算地基承载力的经验公式。Owing to the influence of different weathering environment, the residual solt is of me strong structural, which could influence the mechanical properties of the soil in the laboratory tests. A number of in-situ soil tests such as the pressuremeter tests, the dynamic penetration tests and the high-density resistivity survey have been carried out to get the regularity of the field mechanical properties. The results show that the difference of EH and Ev is about 15% , and they have the good relativity of the pressuremeter modulus in two directions; the mechanical properties of the soil in same depth are of the great difference; the Emand fk calculated from the pressuremeter tests increase with the depth; through the comparison with high-density resistivity survey and the pressuremeter tests, the distribution characteristics of the mechanical properties can be understood; through the comparison with the dynamic penetration tests and the pressuremeter tests, the empirical equation of dynamic penetration tests for this area is obtained.

关 键 词：旁压试验 动力触探 高密度电法 残积土 玄武岩 

分 类 号：TU413.1[建筑科学—岩土工程]