南通市高层建筑荷载对地面沉降的影响

发布时间：2019-03-23 15:36

【摘要】：针对长江中下游第四纪松散沉积层地区由高层建筑荷载引发的地面沉降问题,根据土体非线性流变理论,将比奥固结理论中的本构关系拓展到黏弹塑性,并考虑土体孔隙度、渗透系数及变形参数随有效应力动态变化的关系,建立了南通市高层建筑荷载、地下水渗流与土体变形三维全耦合数学模型.在对模型进行识别、验证的基础上,在地下水停采、仅有高层建筑荷载单独影响的条件下,模拟预测了2010年12月底到2025年12月底每年各含水层组地下水流场变化特征和地面沉降发展趋势.结果表明:南通市崇川区最大地面沉降量为55.28 mm,最大地面沉降速率为3.69mm·a~(-1);通州主城区最大地面沉降量为38.87 mm,最大地面沉降速率为2.59 mm·a~(-1);地面沉降量较大地区位于高层建筑荷载密集区.
[Abstract]:Based on the nonlinear rheological theory of soil, the constitutive relation of Biot's consolidation theory is extended to viscoelasto-plasticity and the porosity of soil is taken into account according to the land subsidence problem caused by high-rise building load in the Quaternary loose sedimentary layer area of the middle and lower reaches of the Yangtze River. Based on the relationship between permeability coefficient and deformation parameters with effective stress, a three-dimensional fully coupled mathematical model of load, groundwater seepage and soil deformation in Nantong high-rise building is established. On the basis of the identification and verification of the model, under the condition that the underground water is closed, only the load of the high-rise building is affected separately, The variation characteristics of groundwater flow field and the development trend of land subsidence in each aquifer group from the end of December 2010 to the end of December 2025 are simulated and predicted. The results show that the maximum land subsidence in Chongchuan area of Nantong City is 55.28 mm, and the maximum land subsidence rate is 3.69mm 路a ~ (- 1). The maximum land subsidence is 38.87 mm, and the maximum land subsidence rate is 2.59 mm 路a ~ (- 1) in the main urban area of Tongzhou, and the area with large ground subsidence is located in the high-rise building load-intensive area.
【作者单位】：河海大学地球科学与工程学院;江苏省地质矿产勘查局;江苏省南京地质工程勘察院;
【基金】：江苏省地质矿产勘查局重点科研项目(dk2012ky01)
【分类号】：P641.2

【参考文献】