玄武岩残积土综合原位测试与分析研究

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。

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

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.