Microstructures of different soil layers caused by the high-rise building group in Shanghai |
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| Authors: | Zhen-Dong Cui Yiqun Tang |
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| Institution: | (1) State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221008, People’s Republic of China;(2) School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangs, 221116, People’s Republic of China;(3) Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, People’s Republic of China |
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| Abstract: | The engineering characteristics of soils are controlled by the state of the microstructure of soils to a great extent. With
the withdrawal of groundwater controlled reasonably, the engineering-environmental effect of the high-rise building group
becomes the main cause of land subsidence in Shanghai. This paper studied the microstructure of each soil layer under the
building loads in the centrifuge model by the scanning electron microscopy and the mercury intrusion porosimetry (MIP) for
qualitative analysis and quantitative analysis, respectively. The shape, size and contact condition of the basic unit of the
soil microstructure were analyzed. The pore structure of each soil layer was studied by MIP, and the pore distribution of
each soil layer was studied by the fractal theory. The ink-bottle effect exists in the intrusion stage in the MIP test. There
are four different fractal dimensions for silty clay of layer No. 4 and clayey soil of layer No. 8 and three different fractal
dimensions for silty sand of layer No. 7 and layer No. 9. The micro and macro mechanisms of land subsidence caused by the
high-rise building group were analyzed. |
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