目前，采用泵送法预制高强度混凝土井壁，在国内尚无成功的先例。
Currently, the method of prefabricating concrete high strength wall by pump transporting is still without successful precedent in our country.
对于疏松粉细砂地基土的加固处理，目前尚无成熟的经验和现成的规范。
For the consolidation treatment on loose powdered fine sand base there are no mature experience and the existing specifications now.
目前在此地质条件下尚无成熟的地下开挖施工技术，而且可借鉴的施工经验也很少。
At present in the geological conditions of the not mature of underground excavation construction technology, but also for the construction experience are few.
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