Study of Seismic Active Earth Pressure Acted on Gravity Wall in Backfill Sand

WANG Li-yan, LIU Han-long

China Journal of Highway and Transport ›› 2009, Vol. 22 ›› Issue (6) : 26-33.

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China Journal of Highway and Transport ›› 2009, Vol. 22 ›› Issue (6) : 26-33.
Original Article

Study of Seismic Active Earth Pressure Acted on Gravity Wall in Backfill Sand

  • WANG Li-yan1, LIU Han-long2
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Abstract

The concept of extent of liquefaction was applied to definition of the development level of excess pore water pressure ratio. Considering time history character of the extent of liquefaction, the seismic active earth pressure was regarded to convert solid earth pressure to viscous dynamic water pressure with increase of extent of liquefaction. Using pseudo-dynamic method, theoretical calculated methods of seismic active earth pressure, distribution of earth pressure and acting point positions of dynamic earth force were deduced. Results show that compared the method with pseudo-static Mononobe-Okabe method and static Coulomb method, the present method can be used to calculate safe and economic results of earth pressure coefficient and damaged wedge angle. Seismic active earth pressure with non-linear distribution increases with increase of depth of wall. It is upper parabola distribution under low extent of liquefaction and is down parabola distribution under high extent of liquefaction; influence of inner friction angle, angle of wall friction and magnification effect of seismic wave on seismic active earth pressure is weakened under high extent of liquefaction.

Key words

road engineering / gravity wall / pseudo-dynamic method / backfill sand / seismic active earth pressure / extent of liquefaction

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WANG Li-yan, LIU Han-long. Study of Seismic Active Earth Pressure Acted on Gravity Wall in Backfill Sand[J]. China Journal of Highway and Transport, 2009, 22(6): 26-33

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