【摘要】 为解决黄河沙坡头水利枢纽右岸坝基的渗漏问题，采用现场压水试验与Abaqus有限元数值模拟相结合的方法，获取各试验段真实渗流系数，结合地勘资料统计分析各岩层的渗透系数，基于Abaqus软件构建坝基三维渗流有限元模型，分别计算灌浆前后基岩的渗流场，并对其渗流特性进行深入对比分析。结果表明：坝基排水孔可有效降低渗透压力，灌浆后防渗帷幕区域水头显著下降，排水孔最大流速降幅达37.5%,总渗流量减少43.7%。研究成果明确了坝基渗流系数分布规律及灌浆前后渗流场变化特征，量化了灌浆对渗流特性的改善效果，可为同类极软岩坝基的渗流分析与灌浆加固提供参考。更多还原

【Abstract】 To address the seepage problem in the right bank dam foundation of the Yellow River Shapotou Water Control Project, a method combining field water pressure tests and Abaqus finite element numerical simulation was adopted to obtain the real seepage coefficients of each test section. Combined with geological survey data, the permeability coefficients of each rock stratum were statistically analyzed. A 3D seepage finite element model of the dam foundation was established based on Abaqus software, and the seepage fields of bedrock before and after grouting were calculated respectively, with an in-depth comparative analysis of its seepage characteristics. The results show that the dam foundation drainage holes can effectively reduce the seepage pressure; the water head in the anti-seepage curtain area decreases significantly after grouting, the maximum flow velocity of drainage holes drops by 37.5%, and the total seepage discharge is reduced by 43.7%. The research results clarify the distribution law of dam foundation seepage coefficients and the variation characteristics of seepage fields before and after grouting, and quantify the improvement effect of grouting on seepage characteristics, which can provide a reference for seepage analysis and grouting reinforcement of similar extremely soft rock dam foundations.更多还原