张顷顷;王来贵;张华宾;高晗;

• 1:辽宁工程技术大学力学与工程学院
• 2:中煤科工集团沈阳设计研究院有限公司

摘要(Abstract)：

为了研究岩体渗透系数的空间变异性对露天矿边坡安全稳定性的影响，基于非饱和渗流理论和随机场理论建立了多台阶边坡渗流随机场模型。根据渗透系数与基质吸力的经验公式和非饱和岩体抗剪强度修正公式，利用Fish语言修正非饱和渗流区渗透系数、抗剪参数等力学参数，借助MATLAB实现渗透系数随机场和Monte-Carlo抽样的非侵入式随机算法，研究渗透系数的变异系数及水平、竖直相关距离对台阶边坡的安全系数及可靠度影响规律，分析台阶边坡可靠度指标对渗透系数变异性的敏感程度。结果表明，非侵入式随机方法实现随机场简单且易于实现，采用渗流随机场进行渗透系数赋值使模型更接近实际边坡状态，可以很好地反映渗透系数的空间变异性。考虑渗透系数空间变异性时的台阶边坡安全系数均值比渗透系数为定常数时小，即客观反映了对边坡安全稳定的保守估计。台阶边坡可靠性指标与渗透系数的变异系数呈线性负相关，与渗透系数的水平及竖向相关距离正相关。边坡安全系数及可靠度指标对渗透系数的变异系数更敏感。研究结论可为开展考虑渗流随机场边坡的变形破坏仿真分析提供参考。

关键词(KeyWords)： 安全工程;台阶边坡;非饱和渗流;随机场;参数敏感性;FLAC~(3D)

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2017YFC1503102);; 国家自然科学基金项目(51504124)

作者(Authors): 张顷顷;王来贵;张华宾;高晗;

DOI: 10.13637/j.issn.1009-6094.2020.1625

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