土體參數(shù)空間分布對邊坡穩(wěn)定性影響研究
[Abstract]:The properties and parameters of soil have significant temporal and spatial variability. In some practical slope engineering cases, it is found that "the slope with a safety factor greater than 1 is unstable." However, the slope with safety factor less than 1 has abnormal stability or two slopes with the same safety factor have different stability states, which does not take into account the randomness and variability of soil parameters. The uncertainty of spatial distribution of parameters such as probability distribution is one of the causes of these phenomena. On the basis of the existing deterministic methods, the uncertainty factors of spatial distribution of soil parameters, such as coefficient of variation, correlation distance, parameter distribution form, soft and hard stratified combination, are introduced in this paper. The influence of the spatial distribution of soil parameters on the slope stability is studied, and the general law of the influence of soil parameters on the slope safety factor is obtained. The main research contents and results are as follows: (1) the general laws of the spatial distribution of slope soil parameters are summarized, including the randomness of the spatial distribution of soil parameters (the spatial variability of soil parameters). The probability distribution of soil parameters and the stratified distribution of slope are two kinds of distribution laws. Further analysis of its characteristics. (2) the random distribution of soil parameters has a significant impact on slope safety factor: with the increase of variation coefficient and correlation distance, the influence on slope safety factor is more and more great. Furthermore, the probability of slope instability becomes larger and larger, and the influence of correlation distance on slope safety factor is greater than that of variation coefficient. (3) when soil parameters are in different probability distribution forms, The safety factor of slope is different, and its influence on safety factor is normal distribution, combination distribution of "logarithmic normal cohesion force of normal cohesion of internal friction angle" and "logarithmic normal distribution of internal friction angle of cohesion force". Logarithmic normal distribution. (4) the distribution of soft and hard layers of slope has a great influence on the safety factor of slope, and the order of soft and hard distribution of safety factor from large to small is as follows: the distribution of soft and hard layers, the distribution of soft layer between hard and hard layers, the distribution of soft and hard layers in order. Soft distribution between middle and hard, soft and hard interlayer distribution, lower soft and upper hard distribution, middle soft and hard distribution.
【學位授予單位】:西安理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU43
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