Comparison of Different Methods for Calculating Persistence Based on Monte Carlo Simulation
-
摘要: 结构面连通率一直是岩体工程领域研究的热点课题，其在评价岩体强度及稳定性方面都发挥着积极作用。而基于蒙特卡洛模拟计算连通率是应用较为广泛且更具经济性的方法。目前，基于蒙特卡洛模拟计算连通率的方法包括带宽投影法、动态规划法和最短路径法。通过举例比较研究三种方法，结果表明，三种方法计算所得连通率值均表现为各向异性；而在投影基线（或剪切、或搜索）方向一定，带宽投影法计算所得连通率值会随着带宽的增大持续增大，而动态规划法和最短路径法计算所得连通率值均是在带宽增大达到一定程度后趋于稳定；且动态规划法和最短路径法计算所得连通率值在不同带宽时均较为一致。综合分析考虑，建议在工程实践中采用最短路径法分析确定连通率建议值。Abstract: Discontinuity persistence has always been a hot topic in the field of rock mass engineering, which plays an active role in the evaluation of rock strength and stability. The calculation of persistence based on Monte Carlo simulation is a more widely used and more economical method. At present, the methods of calculating persistence based on Monte Carlo simulation include bandwidth projection method, dynamic programming method and shortest path method. By comparing the three methods through examples, the results show that the persistence values calculated by the three methods are anisotropic; when the projection baseline (or shear, or search) direction is fixed, the persistence values calculated by the bandwidth projection method will continue to increase with the increase of bandwidth, while the persistence values calculated by the dynamic programming method and the shortest path method tend to be stable with the increase of bandwidth. The persistence calculated by dynamic programming method and shortest path method are consistent in different bandwidth. Based on comprehensive analysis and consideration, it is suggested that the shortest path method should be used to determine the recommended value of persistence in engineering practice.
-
表 1 结构面主要几何参数统计
组号 平均产状/（°） 迹长/m 裂隙密度/m−3 倾向 倾角 分布类型 均值 方差 分布类型 1 175 86 经验 5.4 0.2 对数正态 0.042 2 97 68 经验 1.4 0.5 对数正态 0.089 3 258 35 经验 1.5 0.3 对数正态 0.071 
下载: 导出CSV
-
[1] 兰志广. 复杂结构裂隙岩体三维统计连通率研究—以广西大藤峡泄水闸坝基岩体为例[D]. 长春: 吉林大学, 2020. [2] 肖建勋,程远帆,王利丰. 岩体结构面连通率研究进展及应用[J]. 地下空间与工程学报,2006,(2):325-328. [3] 黄建安,王思敬. 断续结构岩体失稳破坏的分离面[J]. 水文地质工程地质,1984,(6):25-29. [4] 黄润秋. 基体结构面调查的全迹长测量与连通率研究[C]//第六届全国工程地质大会论文集. 2000. [5] 黄国明,黄润秋. 用窗口法估计不连续面的连通率[J]. 水文地质工程地质,1998,(6):29-32. [6] 汪小刚,陈祖煜,刘文松. 应用蒙特卡洛法确定节理岩体的连通率和综合抗剪强度指标[J]. 岩石力学与工程学报,1992,(4):345-355. doi: 10.3321/j.issn:1000-6915.1992.04.001 [7] 陈剑平,卢 波,谷宪民,等. 用投影法求算岩体结构面三维连通率[J]. 岩石力学与工程学报,2005,(15):2617-2621. doi: 10.3321/j.issn:1000-6915.2005.15.003 [8] 李启源. 基于数字近景摄影测量的节理迹长与连通率估计[D]. 长春: 吉林大学, 2017. [9] ZHANG W,LAN ZG,MA ZF,et al. Determination of statistical discontinuity persistence for a rock mass characterized by non-persistent fractures[J]. International Journal of Rock Mechanics and Mining Sciences,2020,126:104177. doi: 10.1016/j.ijrmms.2019.104177 [10] 黄润秋, 许 模, 陈剑平. 复杂岩体结构精细描述及其工程应用[M]. 北京: 科学出版社, 2004. [11] 徐 昱. 节理岩体连通率计算与应用研究[D]. 北京: 中国水利水电科学研究院, 2016. [12] 汪小刚,贾志欣,陈祖煜. 岩石结构面网络模拟原理在节理岩体连通率研究中的应用[J]. 水利水电技术,1998,(10):43-47. [13] 张 文. 乌东德水电站库区岩体结构评价方法研究[D]. 长春: 吉林大学, 2013. [14] LAN ZG,ZHANG W,YANG G,et al. A new method for determining the critical slip surface of fractured rock slope[J]. Environmental and Earth Sciences Research Journal,2019,6(3):136-140. doi: 10.18280/eesrj.060306 [15] 陈剑平. 岩体随机不连续面三维网络数值模拟技术[J]. 岩土工程学报,2001,(4):397-402. doi: 10.3321/j.issn:1000-4548.2001.04.003 [16] 刘 畅. 大藤峡泄水闸坝基岩体的三维裂隙网络模拟研究[D]. 长春: 吉林大学, 2017. [17] ODA M. Fabric tensor for discontinous geological materials[J]. Journal of the Japanese Society of Soil Mechanics & Foundation Engineering,1982,22(4):96-108. -
图(10) / 表(1)
计量
- 文章访问数: 751
- HTML全文浏览量: 78
- PDF下载量: 29
- 被引次数: 0
