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在高地下水位软土地基上进行高速公路路基拓宽,易产生路堤失稳、差异沉降等现象。既有研究多集中于某一种拓宽方式分析。该文基于PLAXIS弹塑性平面应变有限元分析,综合运用Biot固结理论和剪切强度折减法,就双侧对称式拓宽、双侧非对称式拓宽、单侧式拓宽等拼接式拓宽方式及分离式拓宽方式开展数值模拟,比较了4种拓宽方式的潜在滑动面形态、稳定安全系数、超孔隙水压、竖向位移、侧向位移等力学行为。双侧对称式拓宽更有利于提高稳定安全系数,削减路基顶面差异沉降及地基侧向位移。
Soft ground in high groundwater level for highway embankment to broaden, prone to instability of the embankment, differential settlement and so on. The existing research focuses more on one kind of broaden the way analysis. Based on the PLAXIS elastic-plastic plane strain finite element analysis, Biot consolidation theory and shear strength reduction method are used in this paper. In this paper, the methods of widening bilateral symmetry, broadening bilateral asymmetry, unilateral broadening, Type widening mode to carry out numerical simulation, compared with four kinds of widening mode of potential sliding surface morphology, stability safety factor, excess pore pressure, vertical displacement, lateral displacement and other mechanical behavior. Bilateral symmetrical broadening is more conducive to improving the stability and safety factor, reducing the differential subsidence of subgrade settlement and lateral displacement of the foundation.