开采沉陷土体变形与孔隙水压相互作用研究进展

STUDY ON INTERACTION BETWEEN SOIL MASS DEFORMATION AND PORE PRESSURE DURING SUBSIDENCE BY MINING

本文通过实验、实测和理论分析研究了开采沉陷土体变形与孔隙水压力之间的相互作用，结果表明，随着开采的进行，土体的应力变形发生变化造成了超静孔隙水压力的产生和消散，反映在土体变形上出现随开采时间延续而发展的附加压缩和膨胀变形，这种压缩或膨胀在土体的不同部位相互叠加，有时还叠加了底部含水层水位下降引起的地面下沉。这些结果揭示了厚松散含水层地区开采沉陷特殊性的机理，对开采沉陷预测及水体下采煤具有重要意义。

The interaction between soil mass deformation and pore water pressure during subsidence by mining is studied in this paper by theoretical analysis,laboratory tests, and in situ measurements. The results show that the generation and dissipation of super static pore pressure are caused by the variations of stress and deformation in soil mass along with the mining progress. Compressive or expansive deformation occurs and grows with time of mining. The compression and expansion may be superimposed on each other in different parts of soil mass and sometimes on the subsidence caused by drawdown of groundwater level in bottom aquifers. The study reveals a mechanism of subsidence by mining in mines with thick water bearing soil layers and is of significance in subsidence prediction and mining under water body.