采空区地基加固承载特性的数值模拟研究

Abstract工程硕士学位论文AbstractGuizhou province is a major coal producing province in china.Almost all the coal mineis located in the mountains.The mountain caused by underground coal mining subsidencedeformation characteristics and plain areas have the obvious difference.If the existing theoryof mining subsidence is completely applied to the mountain.That would produce error andlead to the mining ground built(structure)planning and building coal pillars's unreasonable,which will cause the waste of land resources and coal resources in mountainous.The study onthe influence of underground mining on the stability of the building foundation is of greatpractical significance to improve the land utilization ratio and the mining area planning.This article take the Guizhou Hezhang Weihe Power Plant as the research object,usingprobability integral method and the key strata theory to predict the deformation of the surfaceto the plant area;simulating the deformation law and characteristics of overlying strata in theprocess of underground mining by;using the stress ratio method to analyze the sinking basinthe building (structure)building foundation stability.Further more,this paper simulate thedeformation of the foundation under the combined action of the construction (structure)andthe coal mining by using On this basis,the stability of the foundation of thebuilding in the study area is evaluated.Through the research of this subject,the followingresearch results are obtained:(1)By means of the probability integral method and the critical layer theory,it is foundthat the stability of the proposed site is mainly affected by surface tilt deformation and surfacehorizontal deformation.(2)The surface subsidence and the horizontal movement range and the value of thesurface are increasing in the process of coal mining.Meanwhile,The scope of influencemoves to the factory.(3)Under the double action of coal mining and building load,the foundation at the edgeof the subsidence basin is mainly affected by uplift deformation and horizontal deformation.(4)The theoretical prediction and numerical simulation results are used to evaluate thestability of the foundation.According to the hazard grade,the southeastern part of the coalmining area of the proposed plant is judged to be the extremely unstable area of thefoundation,and the middle and southern part of the plant is judged to be the basic stable areaof the foundation,and the western and northern parts of the plant are judged as the foundationstability zone.◇