水位波动时堆石坝行为特征及安全管理方案的数值分析

IF 0.4 Q4 ENGINEERING, GEOLOGICAL
Heesuck Jung, Yong-seong Kim, Moojae Lee, Seungjoon Lee, Bibek Tamang, J. Heo, Sung-youll Ahn
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引用次数: 2

摘要

本研究通过数值分析模型,分析了坝体在水位波动过程中的行为特征,并制定了水库安全管理方案。利用数值分析软件GTS NX和LIQCA分析壳芯上下两侧水位升高对塑性偏应变、水平位移、应力路径、孔隙水压力等的影响。分析结果表明,随着坝体水位的快速升高,孔隙水压力和孔隙水位移也随之快速增大。研究发现,水位升高导致坝体孔隙水压力增大,坝体饱和度增大,有效应力减小。认为这种坝体行为可能是导致坝体强度和刚度降低的原因。同时,假定渗水引起坝体变形所累积的塑性偏应变导致位移增大。在此基础上,通过对现有水库安全诊断技术的分析,提出了大坝安全诊断和评价标准的改进方案,这些结果可作为修订大坝安全诊断指南的原始数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Behavioral Characteristics and Safety Management Plan for Fill Dam During Water Level Fluctuation Using Numerical Analysis
In this study, the behavioral characteristics of the fill dam were analyzed during water level fluctuations through a numerical analysis model, and the reservoir safety management plan was prepared. The variation in plastic deviatoric strain, horizontal displacement, stress path, pore water pressure, etc., due to elevation of water level in the upper and lower sides of shell and core were analyzed using numerical analysis software, viz. GTS NX and LIQCA. The analysis results manifest that as the water level in the dam body increases rapidly, the pore water pressure and displacement also increase quickly. It was found that the elevation of the water level causes an increase in pore water pressure in the dam body as well as an increase in the saturation of the dam body and decreased effective stress. It is considered that this type of dam behavior can be the cause of the reduction of strength and stiffness of the dam. Also, it is assumed that the accumulated plastic deviatoric strain due to the deformation of the dam body caused by water infiltration causes an increase in displacement. Based on these experimental results and the results of analyses of the existing reservoir safety diagnosis techniques, an improvement plan for dam safety diagnosis and evaluation criteria was proposed, and these results can be used as primary data while revising dam safety diagnosis guidelines.
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