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FEM SEEPAGE ANALYSIS OF ERTAN DAM

机译：二滩坝的有限元渗流分析

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In the strength and stability analysis of dam-foundation system, it is quite necessary to apply the water pressure forces on both the dam and the foundation. Apparently, a seepage analysis of the whole system is required to obtain a more clear understanding of the water loads. In this paper, based on the fundamentals of seepage theory, some seepage analyses of the dam-site area are conducted by the finite element method. Some typical problems in the numerical modeling of seepage process are analyzed, such as methods for determination of the free surface and techniques for simulating the seepage control measures. Saturated-unsaturated method is suggested to determine the free surface of stable seepage and unstable seepage; "fissure to represent line of holes" method is utilized to simulate the drainage holes curtain; the equivalent permeability coefficient method is used to simulate the impervious curtains. These numerical simulation methods are achieved by the commercial FEM software ABAQUS. Then a 3-D seepage analysis of Ertan arch dam calibrated by engineering data and field records is performed. A refined FEM model is established based on analysis of the geological data and the complicated seepage control measures. Also, the monitoring data of pore pressure is summarized and analyzed. The permeability coefficients of the concrete dam and rock basement are identified by using of appropriate feedback method with in-situ measured seepage data. Finally, it can be shown from the simulation results that the simulated pore pressure agrees well with the monitoring data. It is indicated by the analysis of seepage control measures that the drainage system is comparatively more effective to reduce the pore water pressure than the impervious curtains.
机译：在大坝基础系统的强度和稳定性分析中，非常有必要在大坝和地基上施加水压力。显然，需要对整个系统进行渗流分析才能更清楚地了解水负荷。本文基于渗流理论的基础，采用有限元方法对坝址区进行了渗流分析。分析了渗流过程数值模型中的一些典型问题，例如确定自由表面的方法和模拟渗流控制措施的技术。建议采用饱和-不饱和方法来确定稳定渗流和不稳定渗流的自由面。利用“裂缝代表孔眼线”方法模拟排水孔幕；用等效渗透系数法模拟了不透水的窗帘。这些数值模拟方法是通过商业FEM软件ABAQUS实现的。然后对二滩拱坝进行了3D渗流分析，并通过工程数据和现场记录进行了校准。基于对地质资料的分析和复杂的防渗措施，建立了精细的有限元模型。另外，对孔隙压力的监测数据进行了总结和分析。通过适当的反馈方法和现场测得的渗流数据，确定混凝土大坝和岩石地下室的渗透系数。最后，从模拟结果可以看出，模拟孔隙压力与监测数据吻合良好。通过防渗措施的分析表明，排水系统比不透水的帘幕在降低孔隙水压力方面更为有效。

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