6TERZAGHI K.Theoretical soil mechanics[M].New York:John Wiley and Sons,1943:37-42.
7MARSTON A.The theory of external loads on closed conduits in the light of the latest experiments[R].Iowa State College,Ames,Iowa:Iowa Engineering Experiment Station,1930.
8GIROUND J P,BONAPARTE R,BEECH J F,et al.Design of soil layer-geosynthetic systems overlying voids[J].Geotextiles and Geomembranes,1990,9(1):11-50.
9ADACHI T,KIMURA M,KISHIDA K.Expermental study on the distribution of earth pressure and surface settlement through three-dimensional trapdoor tests[J].Tunnelling and Underground Space Technology,2003,18:171-183.
10HANDY R L.The arch in soil arching[J].Journal of Geotechnical Engineering,1985,111(3):302-318.
