龙潭河水库大坝渗流安全及渗透稳定分析

Analysis of Seepage Safety and Infiltration Stability of Longtanhe Reservoir Dam

摘要:

近年来,龙潭河水库出现大坝上游防渗面板防渗性能降低,坝体浸润线较高,断层渗漏等问题。根据该水库的地勘和检测责料，进行反演参数，对各坝段的坝体断面进行有限元计算,评价该坝的渗流安全及渗透稳定情况。结果表明:坝体浸润线明显高于坝体排水廊道高程，坝基排水孔扬压力较高;坝体局部存在渗漏通道，坝踵区域临近基岩处渗透坡降较大,渗透稳定不满足要求;坝基F1断层岩体裂隙已发生渗透破坏,存在严重渗流安全隐患,大坝渗透稳定较差。

Abstract:

In recent years, the Longtanhe Reservoir has encountered problems such as reduced seepage preventionperformance of the upstream anti-seepage face slab,high phreatic line in the dam body, and fault leakage. Based on thegeological survey and test data of the reservoir, parameter inversion was carried out, and finite element calculations wereperformed on the dam cross-sections of each dam segment to evaluate the seepage safely and seepage stability of the dam.The resuls show that the phreatic line of the dam body is signilicantly higher than the elevation of the dam drainagegallery, and the uplift pressure of the dam foundation drainage holes is relatively high; the seepage happens in the dambody,and the seepage gradient near the bedrock in the dam heel area is large,so that the seepage stabilily does not meetthe requirements; the rock mass fractures of the F1 fault in the dam foundation have undergone seepage failure, posingserious seepage salely hazards, and the seepage stability of the dam is poor.