Abstract
Based on the nonlinear finite element method, the mechanism of embankment reinforced with back berm in road engineering reinforced has been studied. It is found there is almost no influence on the value of vertical settlement at the scope of original embankment by back berm. Only the vertical settlement under the location of back berm has been influenced lightly by back berm. The lateral displacement of embankment could be reduced or restrained by back berm. The stability of embankment enhanced when width of back berm enlarged. But the stability of embankment would not be increased any more when the width of back berm achieved its boundary value, so the width of back berm should not be bigger than the boundary value. The stability of embankment enhanced when the value of cohesion or internal friction angle of back berm increased. So rock and soil with big cohesion and internal friction angle should be used to fill back berm preferentially.
Highlights
Stability and settlement control are the two major technical problems during embankment construction on soft foundation
Such as the section Qian-zi-dang of Jin-yi highway in China, which originally designed as a 560 m long large bridge, had been optimum designed as a 100 m long bridge and 460 m long embankment reinforced with back berm, which reduced project cost more than 15 million RMB [9, 10]
There is no influence on the maximal value of vertical settlement by back berm
Summary
Stability and settlement control are the two major technical problems during embankment construction on soft foundation. Characterized with simple and convenient construction, without special construction machinery, short time for construction, locally raw material used as filling and low cost, back berm is favored by the engineer of road engineering [6~8]. Such as the section Qian-zi-dang of Jin-yi highway in China, which originally designed as a 560 m long large bridge, had been optimum designed as a 100 m long bridge and 460 m long embankment reinforced with back berm, which reduced project cost more than 15 million RMB [9, 10]. Based on nonlinear finite element method, the effect of back berm has been systematic studied in this article, which aim to provide reference for application of back berm in engineering
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