Land subsidence and pore structure of soils caused by the high-rise building group through centrifuge model test
Land subsidence and pore structure of soils caused by the high-rise building group through centrifuge model test
复制标题
高层建筑群引起的地面沉降及土壤孔隙结构的离心模型试验
DOI：
10.1016/j.enggeo.2010.02.003
复制
发表时间：
2010-05-12
影响因子：
7.4
通讯作者：
Tang, Yi-Qun
中科院分区：
文献类型：
--
作者：
Cui, Zhen-Dong;Tang, Yi-Qun
在上海市区，地下水开采受到严格控制，高层建筑群的工程环境效应成为上海地面沉降的主要原因。本文以上海软土地区某高层建筑群为工程背景，通过离心模型试验研究了其地面沉降机理。建筑群中心区沉降较大，沉降叠加效应明显。它可能会超过允许值，并造成地面沉降的危险。研究了不同建筑间距对地面沉降的影响。建筑间距越小，沉降叠加效应越明显。土的工程特性在很大程度上取决于土的孔隙结构状态。提出了比沉降参数作为分析地面沉降与土体孔隙结构关系的纽带。利用压汞法研究了各土层的孔隙结构，并利用分形理论研究了各土层的孔隙分布。上海地区第4层粉质粘土、第8层粘性土、第7层粉质砂和第9层粉质砂以大孔隙为主。在MIP试验中，侵入阶段存在墨水瓶效应。第4层粉质粘土和第8层粘性土具有四种不同的分维值，第7层和第9层粉质砂土具有三种不同的分维值。(C)2010爱思唯尔有限公司版权所有。
In the urban area of Shanghai, the dewatering of groundwater was controlled strictly and the engineering environment effect of the high-rise building group became to be the main cause of land subsidence in Shanghai. Based on the high-rise building group in the soft soil area in Shanghai, the mechanism of land subsidence was studied in this paper by the centrifuge model test. The central area of the building group has larger subsidence and the subsidence superimposition effect is obvious. It can exceed the allowance and cause land subsidence hazard. The land subsidence affected by the different building distances was also studied. For smaller building distances, the subsidence superimposition effect is more obvious. The engineering characteristics of soils are controlled by the state of pore structure of soils to a great extent. The parameter of specific subsidence was put forward as a tie to analyze the relationship between land subsidence and pore structure of soils. The pore structure of each soil layer was studied by the mercury intrusion porosimetry test (MIP) and the pore distribution of each soil layer was studied by the fractal theory. There are mainly macropores in silty clay of layer no. 4, clayey soil of layer no. 8, silty sand of layer no. 7 and layer no. 9 in Shanghai. The ink-bottle effect exists in the intrusion stage in the MIP test. There are four different fractal dimensions in silty clay of layer no. 4 and clayey soil of layer no. 8 and three different fractal dimensions in silty sand of layer no. 7 and layer no. 9. (C) 2010 Elsevier B.V. All rights reserved.