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Li Z.-W.,China Academy of Building Research | Li Z.-W.,Fujian Key Laboratory of Green Building Technology | Zheng G.,Tianjin University
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

Affected by various factors, the stiffness difference of the building adjacent to the excavation is significant. In order to understand the effect of the stiffness difference of building, the response of the building with different stiffnesses adjacent to excavation is analyzed subtly considering the small strain stiffness behavior of soil. The analytical results show that when the building with different stiffnesses locates over the lowest point and the hogging zone of the settlement trough, the tensile strain of the wall is the most obvious. In this case, the locations for any stiffness buildings are in most adversities. With the increase of the stiffness of the building, the deflection and the tensile strain of the wall decrease as the logarithmic curve. For the building with low stiffness, the tensile strain of wall chiefly depends on the extent of the settlement trough and is less affected by its stiffness. When the stiffness of the building is large, the performance of the building affected by the excavation primarily appears as rigid body motion, but the internal deformation of the building is relatively small. Source


Li Z.-W.,China Academy of Building Research | Li Z.-W.,Fujian Key Laboratory of Green Building Technology | Hou W.-S.,China Academy of Building Research | Hou W.-S.,Fujian Key Laboratory of Green Building Technology | And 6 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

In the construction process of deep foundation pits, the passive zone improvement at the pit bottom is often used to control the deformation. But the study on the passive zone improvement at the excavation section of deep foundation pits is very rare. The displacement control effect of the passive zone improvement at excavation section is studied. The results show that the optimal improvement height for the passive zone improvement exists. When the improvement height is lower than the optimal height, the horizontal displacement of the retaining wall and the settlement of the ground surface settlement reduce with the increase of the improvement height. When the improvement height is higher than the optimal height, the maximum of the above-mentioned two remains almost unchanged. But the increase of the improvement height can reduce the horizontal displacement of the top of the retaining wall, which has great significance for the protection of the surrounding environment. Source

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