CAJ | 학술논문

针对地下水埋深较浅地区，由高层建筑荷载引起的土体变形问题，以比奥固结理论为基础，结合土体非线性流变理论，将土体本构关系推广到黏弹塑性；同时考虑土体力学参数及水力参数的动态变化关系，建立了高层建筑荷载引发地面沉降与隆起变形的三维有限元数值模型，详细研究了高层建筑荷载影响下的土体变形特征及此过程中土体力学参数及水力学参数的变化特征。结果表明：由高层建筑荷载引起的地面沉降呈现漏斗状，以建筑物中心为漏斗中心，高层建筑荷载施加初期，高层建筑周围出现隆起，到达最大值后隆起逐渐消失；高层建筑底部浅层土体孔隙度、渗透系数及泊松比均呈现缓慢减小趋势，弹性模量呈现缓慢增大趋势；而高层建筑周围浅层土体的孔隙度、渗透系数及泊松比呈现先增大后减小的变化趋势，弹性模量则呈现先减小后增大的变化趋势；高层建筑影响区域浅部土体参数的变化趋势与土体的回弹及压缩有关。
침대지하수매심교천지구，유고층건축하재인기적토체변형문제，이비오고결이론위기출，결합토체비선성류변이론，장토체본구관계추엄도점탄소성；동시고필토체역학삼수급수력삼수적동태변화관계，건립료고층건축하재인발지면침강여륭기변형적삼유유한원수치모형，상세연구료고층건축하재영향하적토체변형특정급차과정중토체역학삼수급수역학삼수적변화특정。결과표명：유고층건축하재인기적지면침강정현루두상，이건축물중심위루두중심，고층건축하재시가초기，고층건축주위출현륭기，도체최대치후륭기축점소실；고층건축저부천층토체공극도、삼투계수급박송비균정현완만감소추세，탄성모량정현완만증대추세；이고층건축주위천층토체적공극도、삼투계수급박송비정현선증대후감소적변화추세，탄성모량칙정현선감소후증대적변화추세；고층건축영향구역천부토체삼수적변화추세여토체적회탄급압축유관。
Aiming at soil deformation caused by high-rise building load in the region where groundwater buried depth is more shallow,based on the Biot’s consolidation theory and combined with the nonlinear rheological theory of soil,the constitutive relation of soil was extended to viscoelastic plasticity,and the dynamic change relationship of mechanics parameters and hydraulic parameters with pore water pressure was also considered,a three dimensional finite element numerical model of land subsidence and upheaval deformation caused by high-rise building load was established. The characteristics of soil deformation that was affected by high-rise building load and variation characteristics of soil mechanics parameters and hydraulic parameters in this process were studied and analyzed in detail.It is shown that land subsidence caused by high-rise building load is funnel-shaped and the funnel center is high-rise building center.At the early stage of application of high-rise building load, land upheaval appears around building,and land upheaval disappears gradually after land upheaval reached the maximum value.The change trend of porosity,hydraulic conductivity and Poisson’s ratio of shallow soil under high-rise building performs an evolution of decreasing.But the change trend of modulus of elasticity performs an evolution of increasing.Porosity,hydraulic conductivity and Poisson’s ratio of shallow soil around high-rise building performs the tendency of increasing firstly and then decreasing.Modulus of elasticity performs the tendency of decreasing firstly and then increasing.The change trend of shallow soil parameters around the high-rise building is related to the upheaval and the compression of soil.