结构面力学参数空间变异性表征及边坡可靠性分析

doi:10.13722/j.cnki.jrme.2021.0802

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摘要复杂的岩体结构使得岩体参数空间变异性表征与土体参数具有显著的差别。目前针对高度碎裂化/强风化和单结构面占优岩体的参数空间变异性表征及边坡可靠性研究较多，然而关于楔形体和反倾岩体的参数空间变异性表征及边坡可靠性研究非常有限。提出针对楔形体和反倾岩体的边坡结构面力学参数空间变异性表征及可靠性分析方法，并系统统计不同类型岩体力学参数的相关距离和波动范围的取值范围，编写参数空间变异性表征及边坡概率稳定性分析与FLAC3D软件的接口程序，基于反向传播(BP)神经网络构建边坡安全系数与结构面参数随机场向量之间的映射函数关系式，进而采用非侵入式随机有限差分法调查结构面力学参数空间变异性对边坡失效概率的影响规律。结果表明：不同岩体力学参数的相关距离和波动范围的取值范围存在一定的差别，指数型自相关函数是应用最为广泛的理论自相关函数。通过方向模拟和直接蒙特卡洛模拟方法验证提出方法的有效性，表明提出方法具有较高的计算精度和效率，可为楔形体或反倾岩体结构面力学参数空间变异性表征及边坡可靠性分析提供一种有效的途径。此外，忽略结构面参数的空间变异性会高估边坡失效概率，进而导致保守的边坡加固设计方案。

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	蒋水华1
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	李剑平1
	黄劲松1
	周创兵1

关键词 ：边坡工程, 岩质边坡, 楔形体和反倾岩体, 结构面, 空间变异性, 可靠性分析

Abstract：Characterization of the spatial variability of rock mass parameters differs significantly from that of soil parameters due to complex structures inherently existing in the rock masses. At present，the spatial variability modeling of the mechanical parameters of highly fractured/weathered rock masses and those dominated by a single structural plane and associated slope reliability analysis have been extensively studied. However，few attempts have been made to depict the spatial variability of the mechanical parameters of wedge and anti-dip rock masses and conduct associated slope reliability analysis. In this paper，a method for spatial variability modeling of the mechanical parameters of structural planes and slope reliability analysis is proposed for the wedge and anti-dip rock masses. The varying ranges of the autocorrelation distances and scales of fluctuation of the mechanical parameters for different types of rock masses are systematically summarized. An interface program between the spatial variability modeling of the mechanical parameters and probabilistic slope stability analysis with FLAC3D software is developed. An explicit function relationship between the factor of safety of the slope and the random field vectors of structural plane parameters is constructed using the Back-Propagation(BP) neural network. Then the non-intrusive stochastic finite difference method is adopted to explore the influence of the spatial variability of the mechanical parameters of structural planes on the probability of slope failure. The results indicate that the autocorrelation distances and scales of fluctuation of the mechanical parameters are different among different types of rock masses. The single exponential autocorrelation function is the most widely used theoretical autocorrelation function. The direction simulation and direct Monte-Carlo simulation methods are adopted to validate the effectiveness of the proposed method. The proposed method can provide an effective means for the spatial variability characterization of the mechanical parameters of structural plans for the wedge and anti-dip rock masses in the slope reliability analysis. In addition，the probability of slope failure will be overestimated if the spatial variability of mechanical parameters is ignored，which can further result in conservative slope reinforcement design schemes.

Key words： slope engineering rock slope wedge and anti-dip rock masses structural plane spatial variability reliability analysis

引用本文:

蒋水华1，2，李剑平1，黄劲松1，周创兵1. 结构面力学参数空间变异性表征及边坡可靠性分析[J]. 岩石力学与工程学报, 2022, 41(S1): 2834-2845.
JIANG Shuihua1，2，LI Jianping1，HUANG Jinsong1，ZHOU Chuangbing1. Spatial variability characterization of the mechanical parameters of structural planes and reliability analysis of rock slopes. , 2022, 41(S1): 2834-2845.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0802 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2834

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