A new model to predict soil pressure acting on deep burial jacked pipes

Abstract Soil pressure is a critical factor to pipe jacking projects both during and after the jacking. Current practices are based on modifications of one of Terzaghi arching model, e.g. Japan Microtunnelling Association, German standard ATV A 161, UK ‘Pipe Jacking Association’, ASCE 27, and Chinese standard GB 50332. In these practices, it is assumed that shearing bands arise from the outside of tunnel cross sections and extend to the ground surface. However, the shearing bands may desist below the ground surface (This scenario is called deep burial). If these practices are still applied, the calculations will result in underestimations. In this paper, a new calculation model, modified from the other Terzaghi arching model was proposed to specifically predict the soil pressure acting on the deep burial jacked pipes. Values of crucial parameters of the height of the shearing bands, friction angle, friction coefficient, soil pressure ratio, silo width and soil cohesion were analyzed based on published tunnel research results and trap-door experiments. The correctness of the new model was verified by in-situ measured soil pressure in Gongbei Tunnel project in Zhuhai city. In comparison to the in-situ measured soil pressure, the new model provided more logical estimations, while the current practices were found to underestimate the soil pressure.

[1]  K. Terzaghi.  Theoretical Soil Mechanics , 1943 .

[2]  null null,et al.  Standard Practice for Direct Design of Precast Concrete Pipe for Jacking in Trenchless Construction , 2000 .

[3]  A. R. Jumikis,et al.  Mechanics of Soils , 1964 .

[4]  Ioannis Vardoulakis,et al.  Trap‐door problem with dry sand: A statical approach based upon model test kinematics , 1981 .

[5]  Herbert H. Einstein,et al.  Closure of "Investigation of Soil Arching with Centrifuge Tests" , 2015 .

[6]  K. Y. Lo,et al.  Subsidence owing to tunnelling. I. Estimating the gap parameter , 1992 .

[7]  Pizhong Qiao,et al.  Analysis and remedial treatment of a steel pipe-jacking accident in complex underground environment , 2014 .

[8]  Nagaratnam Sivakugan,et al.  Can Soil Arching Be Insensitive to ϕ , 2010 .

[9]  Ian D. Moore,et al.  Earth pressure measurements on buried HDPE pipe , 2011 .

[10]  Harry E. Stewart,et al.  Soil Loads at Pipeline Crossings , 1991 .

[11]  H. Einstein,et al.  SIMPLIFIED ANALYSIS FOR TUNNEL SUPPORTS , 1979 .

[12]  J. N. Shirlaw.  Subsidence owing to tunnelling. II. Evaluation of a prediction technique: Discussion , 1994 .

[13]  Mandar M. Dewoolkar,et al.  CENTRIFUGE MODELING OF GRANULAR SOIL RESPONSE OVER ACTIVE CIRCULAR TRAPDOORS , 2007 .

[14]  Samuel G. Paikowsky,et al.  Experimental Examination of the Arching Mechanism on the Micro Level , 2002 .

[15]  Mark Andrew Marshall.  Pipe-jacked tunnelling : jacking loads and ground movements , 1998 .

[16]  Robert V. Whitman,et al.  Investigation of Soil Arching with Centrifuge Tests , 2014 .

[17]  E. Davis,et al.  The stability of shallow tunnels and underground openings in cohesive material , 1980 .

[18]  Huei-Tsyr Chen,et al.  Tunnel stability and arching effects during tunneling in soft clayey soil , 2006 .

[19]  R. Handy.  The Arch in Soil Arching , 1985 .

[20]  Gaël Combe,et al.  Experimental and discrete element modeling studies of the trapdoor problem: influence of the macro-mechanical frictional parameters , 2012 .

[21]  Robert V. Whitman,et al.  Validation of Centrifuge Model Scaling for Soil Systems via Trapdoor Tests , 2011 .

[22]  Gholamreza Mesri,et al.  The coefficient of earth pressure at rest , 1993 .

[23]  Mohammad Najafi,et al.  Development and applications of trenchless technology in China , 2008 .

[24]  James K. Mitchell,et al.  Fundamentals of soil behavior , 1976 .

[25]  Cdf Rogers,et al.  EXPERIMENTAL STUDY OF A JACKED PIPELINE IN SAND , 1992 .

[26]  B. Ladanyi,et al.  A STUDY OF THE TRAP-DOOR PROBLEM IN A GRANULAR MASS , 1969 .

[27]  R. K. Rowe,et al.  A theoretical examination of the settlements induced by tunnelling: four case histories , 1983 .

[28]  Benedito de Souza Bueno,et al.  Failure Mechanisms in Sand over a Deep Active Trapdoor , 2009 .

[29]  D. P. Krynine,et al.  Discussion of Stability and Stiffness of Cellular Cofferdams by Karl Terzaghi , 1945 .

[30]  R Kastner,et al.  Experimental and analytical study of friction forces during microtunneling operations , 2002 .

[31]  Richard L. Handy.  Anatomy of an Error , 2004 .