A Simplified Method for Predicting Ground Surface Settlement Induced by Deep Excavation of Clay Stratum

HU Zhi-feng; CHEN Jian; QIU Yue-feng; LI Jian-bin

doi:10.11988/ckyyb.20171282

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Journal of Changjiang River Scientific Research Institute ›› 2019, Vol. 36 ›› Issue (6) : 60-67. DOI: 10.11988/ckyyb.20171282

ROCKSOIL ENGINEERING

A Simplified Method for Predicting Ground Surface Settlement Induced by Deep Excavation of Clay Stratum

HU Zhi-feng^1,2, CHEN Jian^1,2, QIU Yue-feng^1,2, LI Jian-bin^1,2

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Abstract

Horizontal displacement of retaining structure is the main cause of ground surface settlement in deep excavation. In this paper we propose a method of estimating the ground surface settlement. First of all we assume that the ground surface settlement curve is a Gaussian probability density function, and derived the analytical formula of ground settlement under different lateral deformation modes of retaining wall based on linear elastic theory. Subsequently we acquired the location x_m of maximum settlement (which is defined as the distance x_m from the location of maximum settlement to foundation pit edge) in clay stratum based on the analytical formula, and then calculated the settlement-influenced range x₀ based on the aforementioned assumed function of ground settlement in association with soil loss theory. Furthermore, we derived the area A_v enveloped by the ground settlement curve, and in the meantime obtained the maximum ground settlement δ_max according to the relation between A_v and A_h, which is the area enveloped by the lateral displacement curve of retaining wall. The ground settlement of arbitrary location behind retaining wall hence can be estimated by substituting δ_max in the aforementioned assumed function. Through several engineering cases we proved that the proposed method is applicable, and thus providing a semi-theoretical and semi-empirical approach to predicting ground surface settlement.

Key words

ground surface settlement prediction / deep foundation pit / clay stratum / horizontal displacement of retaining wall / analytical solution / the soil loss theory

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HU Zhi-feng, CHEN Jian, QIU Yue-feng, LI Jian-bin. A Simplified Method for Predicting Ground Surface Settlement Induced by Deep Excavation of Clay Stratum[J]. Journal of Changjiang River Scientific Research Institute. 2019, 36(6): 60-67 https://doi.org/10.11988/ckyyb.20171282

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