Application practice and settlement estimation of composite ground for high-rise buildings on coral sand site of hydraulic fill
Wen Bing1 Yuan Neizhen2 Kong Lingwei3 Chen Cheng3
1. China Construction Third Bureau First Engineering Co., Ltd., Wuhan 430000, China; 2.Hubei Provincial Academy of Building Research and Design
Co., Ltd., Wuhan 430071, China; 3. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
Abstract：For the social housing project in Hulhumale Island of Maldives in which 16 25-storey residential buildings composed of 7000 houses are built on the coral sand site of reef limestone of hydraulic fill, the composite ground scheme of plain concrete pile is proposed for the first time to treat coral (calcareous) sand ground according to its engineering characteristics. The piling technology of long helical pile of pressure grouted shaft is discussed and improved. The reinforcement effectiveness of the proposed treatment scheme is verified by the static load tests of single pile and composite ground of single pile as well as the monitored results of building settlement. The settlement calculation methods of composite ground by referring to “Technical Code for Ground Treatment of Buildings” (JGJ 79—2012) and “Standards for Geotechnical Investigation of Tall Buildings” (JGJ/T 72—2017) are compared and then verified by the finite element analysis results. The analysis results disclose that the finite element results agree well with the monitoring results, and moreover the finite element approach may obviate the difficulty in accurately determining the compression modulus of coral sand ground of hydraulic fill which is generally required by the Code method. Hence, in similar major projects, the finite element method, in which the calculation parameters can be attained from back analysis in terms of the static load tests, is capable of verifying the calculation results of the Code method and optimizing the engineering design.
文兵 袁内镇 孔令伟 陈成. 吹填珊瑚砂场地高层建筑复合地基工程实践与沉降估算[J]. 土木工程学报, 2021, 54(12): 85-93.
Wen Bing Yuan Neizhen Kong Lingwei Chen Cheng . Application practice and settlement estimation of composite ground for high-rise buildings on coral sand site of hydraulic fill. 土木工程学报, 2021, 54(12): 85-93.
