滑坡滑带土探查、强度参数反演及敏感性分析

滑带土由于成因和结构的特殊性,在实际工程中,采用钻探无法准确的揭露其埋深、分布情况和获得良好的试样,为了查明某滑坡滑体的岩土层分布情况、裂缝发育情况及滑带的埋深,并得到滑带土的抗剪强度参数,结合钻孔、探槽和探井三种方式对某滑坡进行地层结构研究,并对滑带土进行土工试验、强度参数反演计算和敏感性分析,通过研究发现:(1)钻孔、探槽和探井都可以很好的揭露滑体岩土层分布情况,此外,探槽能够揭露滑体裂缝的发展和分布情况,探井可以到达滑带,有助于滑带土的观察和取样;(2)采用规范法反演计算出来的强度参数与试验结果接近,证明了该方法具有较高的准确性,适用于工程实践;(3)强度参数C和φ值的增大都会引起滑坡稳定性系数的增大,其中稳定性系数对φ值的敏感性强于C值。

Soil Exploration,Strength Parameters Inverse Calculation and Sensitivity Analysis of Soil in Slide Zone of a Landslide

Due to the particularity of formation and structure of slide zone soil,it is difficult to accurately reveal its buried depth,distribution and obtain qualified samples only by drilling in practical projects.In order to find out the distribution of rock and soil layers,fracture development and the buried depth of the slip zone of a landslide,then obtain the shear strength parameters of the slide zone soil.The stratigraphic structure of a landslide was carried out in combination with drilling hole,exploratory trenches and exploratory wells,meanwhile,the geotechnical test,strength parameter inversion calculation and sensitivity analysis were carried out on the slide zone soil.Research findings:(1)Drilling holes,exploratory trenches and exploration wells can clearly reveal the distribution of rock and soil layers of the sliding body,in addition,exploration trenches can reveal the development and distribution of cracks in sliding body,and exploration wells can reach the slide belt,which is contributed to the observation and sampling of the slide zone soil;(2)The strength parameters calculated by the specification method are close to the test results,which proves that this method is accurate and suitable for engineering practice;(3)The increasing of strength parameter C andφwill cause an increase of landslide stability coefficient,of which the stability coefficient is more sensitive ofφthan the value of C.