JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2019, Vol. 36 ›› Issue (6): 60-67.DOI: 10.11988/ckyyb.20171282

• ROCKSOIL ENGINEERING • Previous Articles     Next Articles

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

HU Zhi-feng1,2, CHEN Jian1,2, QIU Yue-feng1,2, LI Jian-bin1,2   

  1. 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
    2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-11-07 Online:2019-06-01 Published:2019-06-12

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 xm of maximum settlement (which is defined as the distance xm 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 Av enveloped by the ground settlement curve, and in the meantime obtained the maximum ground settlement δmax according to the relation between Av and Ah, 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 δmax 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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