土工基础

›› 2015, Vol. 29 ›› Issue (5): 67-69.

• 工程实录 • 上一篇    下一篇

炭质泥岩土石混合料大型直剪试验研究

刘子昂1,满 立2   

  1. (1.中冶集团武汉勘察研究院有限公司，武汉 430080；2.贵州大学 喀斯特环境与地质灾害防治教育部重点实验室，贵阳 550003)
  • 收稿日期:2014-10-31 出版日期:2015-10-20 发布日期:2015-11-06
  • 作者简介:刘子昂（1988-），男，硕士，助理工程师，研究方向为软土地基处理、桩基加固、岩上工程勘察。

LargeScale Direct Shear Test on Carbonaceous Mudstone Mixtures

LIU Ziang1， MAN Li2   

  1. (1.Wuhan SurveyingGeotechnical Research Institute Co., Ltd. OF MCC Wuhan, 430080；
    2.Key Laboratory of Karst Environment and Geohazard Prevention, Ministry of Education, Guizhou University, Guiyang 550003)
  • Received:2014-10-31 Online:2015-10-20 Published:2015-11-06

摘要： 炭质泥岩是一种特殊的泥岩，西南地区炭质泥岩土石混合料广泛分布。通过对不同炭质泥岩含量试样的大型直剪试验，研究了30%、60%、100%三种含量的炭质泥岩土石混合料抗剪强度指标的变化规律，并对天然和饱和两种状态下炭质泥岩土石混合料进行大型剪切试验研究，试验结果表明：相同法向应力下，炭质泥岩含量越大，抗剪强度越大；随着炭质泥岩含量的增大，混合土石料的内摩擦角变小，内聚力变大；天然状态的剪应力随着水平位移增大而增加，没有明显的峰值，而饱和状态的剪应力与水平位移关系曲线趋于水平。

关键词: 炭质泥岩土石混合料, 抗剪强度指标, 大型直剪试验, 剪应力

Abstract: The carbonaceous mudstone is a special soft rock that is widely distributed in Southwestern China. The carbonaceous mudstone aggregate mixtures samples are tested by a large size direct shear test device under both saturated and unsaturated conditions. The aggregate mixtures have three different carbonaceous mudstone contents: 30%, 60% and 100%. The test results indicate that, under the same vertical stress, the shear strength increases with the increase of carbonaceous mudstone contents. With the increase of carbonaceous mudstone contents, the internal friction angle decreases and the cohesion values increases. The shear stress increases with the increase of the horizontal displacement and no obvious peak values are observed. Under the saturated condition, a flatter shear stress and horizontal displacement relationship can be found.

Key words: Aggregate of Carbonaceous Mudstone Mixtures, Shear Strength Parameters, LargeSize Direct Shear Tests, Shear Stresses