doi:10.16186/j.cnki.1673-9787.2020.5.3

Received:2020/01/20

Revised:2020/03/09

Published:2020/09/15

Upper bound limit analysis of frozen wall stability in deep topsoil shaft

CHEN Jun1, CHEN Qifan1,2, KANG Yiqiang1, ZHAO zhiwei1, ZHANG Lanyue1

1.School of Mechanics and Civil Engineering， China University of Mining and Technology （ Beijing） ， Beijing  100083 ， China;2.Wanfu Coal Mine Yanzhou， Coal Mining Company Limited， Juye  274900 ， Shandong， China

Abstract:When artificial freezing method is used in the construction of shaft in deep topsoil， freezing wall stability is an important factor of the influence on shaft working surface and outer sidewall safety. Considering the impact of the deep topsoil horizontal ground pressure， concrete hydration heat and freezing wall material properties ，single rigid-body and combined rigid-body forms of frozen wall damage model were built by using limit analysis upper bound theory. Frozen limit pressure value variation range and its influence on outer shaft wall ware obtained. The possibility of freezing wall destruction in different angles and depths， the influence of the damage range of the freezing wall on the hollow wall were studied， and the calculated results were compared with the measured results. The results showed that the freezing pressure caused by the deformation of frozen wall would be far greater than the horizontal ground pressure calculated by liquid formula， with the increasing of buried depth the freezing pressure not only increased significantly， but also with the frozen wall deformation expanding， freezing pressure growth was accelerated. The upper bound values of the frozen pressure were calculated under different failure modes of the frozen wall， and the comparison with the measured results could deduce the possibility of the destruction of the frozen wall，which was favorable to the engineering practice.

Key words:shaft;hollow wall;freezing method;stability analysis;frozen wall

深厚表土层立井冻结壁稳定性上限分析_陈骏.pdf