基于LHS的坝基岩体三维裂隙网络模拟

发布时间：2019-04-26 06:21

【摘要】：坝基岩体裂隙发育直接影响水电工程的结构安全与渗流稳定,建立准确的坝基岩体三维裂隙网络模型是分析坝体安全的基础。岩体裂隙数量巨大,分布复杂,以往的研究多采用Monte Carlo简单随机抽样方法获取裂隙参数的样本数据,进而建立二维或三维裂隙网络模型,忽略了揭露面以下裂隙数据对模拟结果的影响,计算结果稳定性差、精度低,且容易产生样本坍塌的问题。本文提出了水电工程坝基岩体三维裂隙网络的模拟方法,即在坝基揭露面裂隙数据的基础上,融合钻孔摄像技术获取的钻孔全孔壁资料,对裂隙面位置、大小、数量和产状等参数进行统计;然后采用拉丁超立方抽样(Latin Hypercube Sampling)方法对裂隙参数进行随机模拟;最终利用Visual Geo软件建立三维裂隙网络模型。该方法应用于某水电站坝基裂隙三维网络模拟中,并与传统的Monte Carlo方法进行对比,结果表明:该方法在融合揭露面裂隙资料和钻孔摄像数据的前提下,空间填充性好,模拟结果更加接近实测值,为水电工程坝基稳定分析提供了可靠的技术手段和准确的模型基础。
[Abstract]:The fracture development of dam foundation rock mass directly affects the structural safety and seepage stability of hydropower project. The establishment of accurate three-dimensional fracture network model of dam foundation rock mass is the basis for analyzing dam body safety. The number of fractures in rock mass is huge and the distribution is complex. In the past, Monte Carlo simple random sampling method was used to obtain the sample data of fracture parameters, and then a two-dimensional or three-dimensional fracture network model was established. The influence of the crack data under the exposed surface on the simulated results is ignored. The stability and accuracy of the calculated results are poor and the sample collapse is easy to occur. In this paper, a simulation method of 3D fracture network of dam foundation rock mass is presented in this paper, that is, on the basis of the crack data of dam foundation exposed surface, the full borehole wall data obtained by borehole camera technology are fused, and the location and size of fracture surface are analyzed. Statistics were made on the parameters such as quantity and occurrence. Then the Latin hypercube sampling (Latin Hypercube Sampling) method was used to simulate the fracture parameters randomly. Finally, the three-dimensional fracture network model was established by using Visual Geo software. The method is applied to the 3D network simulation of dam foundation fissures of a hydropower station and compared with the traditional Monte Carlo method. The results show that the method has good space filling ability on the premise of fusion of the exposed plane fracture data and the borehole camera data. The simulation results are closer to the measured values, which provides reliable technical means and accurate model basis for dam foundation stability analysis of hydropower projects.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金(51321065;51439005) 国家重点基础研究发展计划(973计划)资助项目(2013CB035904)
【分类号】：TV223.3

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