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由于河口村水库大坝坝基地址情况复杂,大坝坝基覆盖层厚,且岩性及地层结构特殊,主要岩性为漂卵石、并含有粘土夹层及砂层透镜体,部分岩土体虽然较密实,但均匀性较差,大坝填筑后可能存在不均匀变形等问题。为防止大坝面板及基础趾板、连接板、防渗墙变形过大,需对大坝基础进行加固处理,以确保水库建成后能够安全运行。文章探讨覆盖层基础通过深孔旁压试验,求取旁压剪切模量及地基承载力,为设计施工提供参考数据。
Due to the complicated dam site address of dam reservoir in Hekou Village, the dam foundation is covered with a thick coating with special lithology and stratum structure. The main lithology is pebble, and contains clay interlayer and sand lens. Although some rock and soil bodies are dense , But the uniformity is poor, there may be uneven deformation after the dam filling and other issues. In order to prevent dam panel and foundation plinth, connecting plate, impervious wall deformation is too large, the dam foundation needs to be reinforced to ensure the safe operation of the reservoir after it is completed. The paper discusses the basis of overburden through deep hole pressure test, to obtain the next pressure shear modulus and foundation bearing capacity, provide reference data for design and construction.