【摘要】 土坝坝体劈裂式灌浆基于坝体的小主应力大小和分布,利用“水力劈裂”原理对坝体有计划、有控制地进行劈裂,同时灌入合适的泥浆;通过浆坝互压使泥浆固结,形成浆体防渗帷幕,截堵渗漏带、充填裂缝、消除隐患;并使部分坝体压密,应力状态改善。从正常灌浆工艺和非正常灌浆工艺的原型观测试验中,总结出保证坝体安全和提高灌浆效果的工艺措施。土坝应力、孔隙水压力、变形观测和工程实践表明:劈裂式灌浆有效地提高了坝体的防渗性能和变形稳定性。更多还原

【Abstract】 The fracturing grouting of completed earth dams is based on the principle of hydraulic fracturing. The fractured plane is developed in dam body approximately along the dam axis and normal to the direction of minor principal stress. The slurry is injected into the fractured plane through a series of boreholes under suitable control and is consolidated by the interaction between the grout filled in and dam body to form a antiseepage curtain for filling up the cracks, sealing the leakage and removing the hidden peril. The earth fills were densified and the stress condition was improved locally during the process of grouting. In-situ instrumentation and engineering practice have shown that this technique can improve the anti-seepage capability and deformability of the damaged earth dams effectively.更多还原