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临界滑面的确定一直是岩土工程界研究的热点问题。利用有限元-强度折减法对二维边坡进行稳定性分析时,对于进入极限平衡状态的边坡而言,沿边坡深度方向的等效塑性应变最大值点一般也就是临界滑面上的点。然后通过预设一组相互平行且与坡面近似垂直的直线,找出各直线上等效塑性应变的最大点,可得到一系列呈波动状分布的点,这些点构成了一组一维的信号函数;再利用小波分析对数据进行平滑处理就可得到边坡的临界滑面。通过经典算例分析并与Spencer法等前人的研究成果比较,结果表明该方法是合理有效的,可以用于边坡临界滑面的确定。
The determination of critical slip surface has always been a hot issue in geotechnical engineering research. When the stability analysis of two-dimensional slope is carried out by finite element-strength reduction method, the maximum value of equivalent plastic strain along the depth of slope is also the point on the critical slip surface . Then by presetting a group of straight lines parallel to each other and approximately perpendicular to the slope, the maximum point of equivalent plastic strain in each straight line can be found and a series of points with fluctuating distribution can be obtained. These points form a set of one-dimensional Signal function; and then using wavelet analysis to smooth the data can be obtained by the slope of the critical slip surface. The results of the classical example analysis and comparison with previous studies such as Spencer show that the method is reasonable and effective and can be used to determine the critical slip surface of the slope.