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依据太沙基固结理论,利用解析解,对单向饱和黏土加载后的超静孔压、沉降量随时间的变化特征进行计算,采用FLAC3D中的渗流模块进行了相同条件下黏土模型加载后的超静孔压消散流固耦合模拟,并与太沙基解析解进行对比。结果表明,单向固结条件下,用FLAC3D模拟饱和土的固结沉降值,与其解析解十分吻合,可采用该渗流模块来模拟排土场固结沉降问题。在排土场地基中设置竖向砂井,基于砂井固结法进行了超静孔压消散模拟,将排土场地基处理前后固结沉降达到稳定的时间进行了对比。模拟结果表明,地基经过砂井处理后,固结时间明显缩短,对露天矿排土工作的接续有显著作用。
According to the theory of consolidation of Taishaji, the analytical solution is used to calculate the over time pore pressure and settlement of the unidirectional saturated clay under the same conditions. By using the seepage module in FLAC3D, the clay model under the same conditions is loaded Of the excess pore pressure dissipation fluid-solid coupling simulation, and compared with the terrestrial analytical solution. The results show that under the condition of unidirectional consolidation, the consolidation settlement value of saturated soil simulated by FLAC3D is in good agreement with its analytical solution. This seepage module can be used to simulate the consolidation settlement of the dump. Vertical sand wells are set up in the foundation of the dump site, and the simulation of excess pore water pressure dissipation based on the sand well consolidation method is carried out. The consolidation settlement time before and after the foundation treatment in the dump site is compared. The simulation results show that the settlement time of the foundation after the sand well treatment is obviously shortened, which plays a significant role in the continuation of the drainage work of the open pit mine.