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临江Ⅱ号崩滑体天然粒度成分滑带土三轴试验研究
供稿: 李云安;王月伟 时间: 2018-07-18 次数:

作者:李云安;王月伟

作者单位:中国地质大学(武汉)工程学院

摘要:为研究粗颗粒组分对滑带土强度的影响,使用大型三轴剪切仪对临江Ⅱ号崩滑体TP4平硐天然粒度成分滑带土进行固结不排水剪切试验,通过沿试样轴向打砂孔(直径1 cm,孔距7.5 cm),使试样内部含水条件满足试验要求,试验得到试样抗剪强度参数;然后将天然粒度成分滑带土强度参数、细粒组滑带土强度参数分别用于边坡的稳定性计算,从而验证试验结果。结果表明:粗颗粒增加后,滑带土内摩擦角变化不大,内聚力由25 k Pa增至90 k Pa;随着粗粒组增加,边坡稳定系数由0.954增至1.127,临江Ⅱ号崩滑体的稳定系数提高了18.13%,边坡由不稳定状态变为稳定状态。临江Ⅱ号崩滑体现处于稳定状态,对于该类边坡滑带土,粗颗粒组分对边坡稳定性的影响不容忽视,强度试验中不应将其剔除。

基金:国家重点基础研究发展计划(973)项目(2011CB710602);

关键词:天然粒度成分;滑带土;大型三轴试验;边坡;

Abstract:In order to study the effect of coarse particles on the strength of sliding zone soil, the sample with sand bores ( diameter is 1 cm, space between sand bores is 7. 5 cm) are perforated along axial direction. Then large-scale triaxial test equipment are used in consolidated-undrained shear test of sliding zone soil of natural grain size composition in TP4 adit in riverside slumping mass Ⅱ. To verify the test results, stability of riverside slumping mass Ⅱ is calculated separately with strength parameters of sliding zone soil with natural grain size composition and less than 2 mm fine grain group. The results show that the cohesion of sliding zone soil is increased from 25 kPa to 90 k Pa after increasing coarse particles and the internal friction angle is not changed significantly. Meanwhile, the slope stability coefficient is increased from 0. 954 to 1. 127 and the stability coefficient of riverside slumping mass Ⅱ increased by 18. 3%. The slope is changed from unstable state to stable state. Currently, riverside slumping mass Ⅱ is in stable state. For the sliding zone soil of riverside slumping mass Ⅱ, the influence of coarse particles in slope stability could not be ignored and coarse particles should not be eliminated in strength tests.

DOI:10.16186/j.cnki.1673-9787.2018.04.20

分类号:TU41

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