高压下饱和黏土B系数研究

发布时间：2019-03-21 14:30

【摘要】：为了对高压与常压固结后饱和黏土B系数之间存在差异性与否,及其影响因素展开研究,利用GDS三轴试验机开展了固结压力为2 MPa的饱和黏土等向固结试验,其中特别设计进行了高压固结前后的B系数检测试验。试验结果表明:"饱和"黏土高压固结B系数明显小于1的原因在于试样无法达到饱和度100%的理想饱和状态,而并非先前研究报道的高压固结后黏土样内孔隙水以物理性质明显不同于自由水的结合水为主。另外,饱和黏土高压固结过程中,孔压完全消散明显滞后于常规体积变形时间对数曲线上主固结完成点的出现;高压固结后饱和黏土B系数达到稳定的时间明显长于常压相应值。
[Abstract]:In order to study the difference between high pressure and normal pressure saturated clay B coefficient and its influencing factors, the isotropic consolidation test of saturated clay with 2 MPa consolidation pressure was carried out by GDS triaxial testing machine. In particular, the B coefficient test before and after high-pressure consolidation was carried out. The experimental results show that the high pressure consolidation B coefficient of saturated clay is obviously less than 1 because the specimen cannot reach the ideal saturation state of 100% saturation. It is not reported previously that pore water in clay samples after high pressure consolidation is dominated by bound water whose physical properties are obviously different from that of free water. In addition, in the process of high-pressure consolidation of saturated clay, the complete dissipation of pore pressure obviously lags behind the appearance of the main consolidation completion point on the logarithmic curve of the normal volume deformation time. The time of stability of saturated clay B coefficient after consolidation under high pressure is obviously longer than that of the corresponding value under normal pressure.
【作者单位】：中国矿业大学深部岩土与地下工程国家重点实验室;中国矿业大学力学与建筑工程学院;
【基金】：国家自然科学基金项目(51009136) 江苏省自然科学基金项目(BK2011212) 中国博士后自然科学基金项目(2012M521145)
【分类号】：TU442

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