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在石灰岩发育地区,基岩埋深浅且起伏较大,河床沉积层中含有大粒径卵石,在围堰打入或下放困难等特殊地质条件下,对基坑土体采用速凝浆液注浆进行加固的基坑开挖技术。对基坑周边土体注入速凝浆液进行加固,使基坑周边土体固结形成复合地基及止水帷幕,以辅助基坑开挖,有效地解决了工程难题,取得了较好的应用效果。
In the limestone development area, the bedrock is shallow and undulating, and the bed sediments contain large-sized pebbles. Under the special geological conditions such as cofferdam driving in or out of the cofferdam, quick-setting slurry grouting is applied to the foundation pit soil, Reinforced excavation technology. So as to reinforce the quick-setting slurry injected into the soil around the foundation pit to consolidate the soil around the foundation pit to form a composite foundation and a water-stopping curtain to assist excavation of the foundation pit, thus effectively solving the engineering problem and achieving good application effects .