Study On The Law Of Dewater Settlement Of Bottom Aquifer In Overburden

Based on a series of simulation tests and theoretical and numerical analyses, this thesis approaches deeply into the law of dewater consolidated settlement and correlated parameters of the bottom aquifer in overburden. Using the apparatus of high stress and high hydraulic pressure developed by author, a series of tests was carried out, and the expressions of dewater consolidated settlement with hydraulic pressure and coefficient of permeability with efficient stress was obtained. The important factors affecting regression coefficients made systemically analysis for the first time from characteristic grain and parameter. The positive correlativity of modulus of compressibility with hydraulic pressure drop was found. A method of measured pre-consolidation pressure was put forwarded, which was simple and handle, and the mechanical properties of deep soil was pilot studied. The analytical and semi-analytical solutions of water head or settlement displacement based on Terzaghi and Biot consolidation theory were deduced in a series of boundary conditions. The program about implicit difference method was compiled, and the numerical simulation procession that takes into account mechanic index influenced by dewatering was carried through. Finally, it was given that calculating demonstrations about dewater settlement and additional vertical force.