某拱坝坝前断层处理措施及效果分析

Fault Treatment Measures and Effects Analysis of an Arch Dam

某拱坝坝前发育规模较大的F1断层,地质结构复杂,对拱坝防渗设计及整体安全影响较大。在对F1断层应力、应变分析的基础上,结合坝基帷幕灌浆、固结灌浆等措施,对F1断层采取了开挖并回填混凝土断层塞、加强固结灌浆、帷幕灌浆及化学灌浆等一系列处理措施。通过对处理后典型坝段区域内F1断层化学灌浆单位注入量分析、结石分析等表明,上述处理措施能有效提高坝基防渗安全储备,避免坝基渗漏的产生。

A large-scale F1 fault with complicated geological structure developed in front of an arch dam and it has a great impact on the anti-seepage design and overall safety of the arch dam.Based on the stress and strain analysis of F1 fault,combined with measures such as curtain grouting and consolidation grouting of the dam foundation,a series of treatments such as excavation and backfilling of concrete fault plugs,enhanced consolidation grouting,curtain grouting,and chemical grouting were adopted for F1 fault.Analysis of unit injection volume and stone analysis of chemical grouting for F1 fault in the typical dam section after treatment shows that the above-mentioned treatment measures can effectively improve the dam foundation's anti-seepage safety reserve and avoid dam foundation leakage.