模拟排水孔列渗流行为的以沟代孔列延长渗径法研究

发布时间：2018-03-15 06:32

本文选题：渗流　切入点：排水孔　出处：《岩土力学》2017年01期 　论文类型：期刊论文

【摘要】：排水孔是降低岩土体中地下水位和减小渗透压力的重要设施。因排水孔孔径小、排列密集,研究排水孔列的简化模拟方法对减小渗流数值计算规模,提高计算效率十分必要。基于流量等效原理的以沟代井列的延长渗径法,因其概念清晰、实现简便,在承压含水层井列的渗流场模拟中应用广泛。现有以沟代井列的延长渗径法中附加渗径计算公式与井深和含水层厚度息息相关,使得该方法应用于多层和有自由面的问题困难重重。针对现有延长渗径法的局限性,提出适用于有自由面的各向异性多种介质中排水孔列渗流问题的延长渗径法,附加渗径长度的确定不再受到孔深和含水层厚度的影响。采用该方法对几个典型的溢流型、逸出型和复合型排水孔列进行渗流场有限元分析,并与排水孔直接模拟的结果进行对比。结果表明,延长渗径法得到的排水孔的流量与排水孔直接模拟法的流量相差很小,且两种方法获得的自由面基本吻合。因此,提出的延长渗径法是模拟排水孔列渗流行为的简单而有效的方法。
[Abstract]:Drainage holes are important facilities for reducing groundwater level and seepage pressure in rock and soil. Because of the small aperture and dense arrangement of drainage holes, the simplified simulation method of drainage hole train can reduce the scale of numerical calculation of seepage flow. It is necessary to improve the calculation efficiency. Based on the principle of flow equivalence, the extended seepage path method with ditch instead of well series is simple and easy to realize because of its clear concept. It is widely used in the seepage field simulation of confined aquifer series. The calculation formula of additional seepage diameter in the extended seepage diameter method with trench instead of well column is closely related to the depth of the well and the thickness of the aquifer. It is difficult to apply this method to the problems of multilayer and free surface. In view of the limitation of the existing extended seepage path method, the extended seepage diameter method is proposed to solve the seepage problem of drainage holes in anisotropic multi-media with free surface. The determination of additional seepage diameter length is no longer affected by the depth of the pore and the thickness of the aquifer. This method is used to analyze the seepage field of several typical overflow, escape and composite drainage holes. The results show that the discharge of the drainage hole obtained by the extended seepage diameter method has little difference from that obtained by the drainage hole direct simulation method, and the free surface obtained by the two methods is basically consistent with that obtained by the two methods, and the results are compared with the results obtained by the direct simulation of the drainage hole. The extended seepage diameter method is a simple and effective method to simulate the seepage behavior of drainage holes.
【作者单位】：北京科技大学土木与资源工程学院;中国农业大学理学院;四川能投电力开发有限公司;
【基金】：中央高校基本科研业务费专项资金项目(No.2013BH008)资助项目中国农业大学教育基金“岩土力学研究创新团队”项目~~
【分类号】：TV223.4

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