INVESTIGATION ON EXCAVATION FACE SUPPORT PRESSURE CALCULATION METHODS OF SHIELD TUNNELLING IN CLAYEY SOIL
ZHANG Zixin1,2,HU Wen1,2
(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;2. Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)
Abstract:The determination of the face supporting pressure has been one of the key problems in tunnelling engineering. This paper presents a discussion in depth on six different calculating models of the face supporting pressure. Based on the characteristics of clayey soil,the famous Horn?s silo model was modified and the calculation equation on clayey soil,which considers the soil arching effect,was successfully derived. Taking Qianjiang tunnel for example,the calculating results by seven different face supporting pressure methods were analyzed;and their applicability was investigated as well. Detailed discussion on the choosing of calculation parameters was given;so as to provide reference values for similar projects.
BROERE W. Tunnel face stability and new CPT applications[Ph. D Thesis][D]. Delft:Delft University of Technology,2001.
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