Displacement Characteristics of a Deep Excavation in Hangzhou Soft Clay
- Release time:2024-08-09
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Affiliation of Author(s):
土木工程学院
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Journal:
Advances in Civil Engineering
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Key Words:
specially shaped deep foundation pit; wall deflection; settlement; Hangzhou soft clay; Numerical simulation
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Abstract:
Excavations in soft soil area are usually associated with substantial difficulties. Taking a special-shaped deep foundation pit in Hangzhou soft clay as the research object, the excavation performances, including groundwater level height, axial force, lateral wall and soil deflection, and ground surface settlement were monitored and summarized based on data published in the literature on similar excavations in Hangzhou, P. R. China. The following conclusions are drawn: (1) The axial forces of the struts dynamically change during the excavation and construction or removal of adjacent braces. (2) The ratio between the measured maximum wall deflection and excavation depth (δ_(h-max)/H_e) is 0.14-0.17%, larger than those in Shanghai. (3) The surface settlement behind the wall has an obvious primary influence zone and secondary influence zone, characterized by a “groove shape” and “triangle shape”, respectively. The maximum ground surface settlement δ_(v-max) ranges from 0.29% to 0.5% of the excavation depth. (4) The distribution of the ground settlement was analyzed. The relationship between the maximum settlements δ_(v-max) is between 1.28δ_(h-max) and 3.72δ_(h-max). Moreover, ABAQUS software with Mohr-Coulomb soil models was used for model analysis of the construction process. The research results have important significance for effective prevention of foundation pit accidents and optimal design of deep foundation pit projects.
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First Author:
meiyuan
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Indexed by:
Journal paper
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ISSN No.:
1687-8086
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Translation or Not:
no
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Date of Publication:
2022-03-16
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