全卵石地质条件下地连墙冲击成墙法的工艺

Research on Feasibility of Construction of Continuous Diaphragm Wall by Impaction in the Scree Geologic Condition

阐述了在青藏高原拱起形成的全卵石孤漂石特殊地质下,通过对原设计沉井下沉风险分析、地连墙成墙方案比选以及冲击成墙法施工桩柱式地下连续墙的工艺可行性试验探索,论证了在特殊地质条件下成墙可行性和成墙接头止水性,并用于指导拉萨柳梧大桥有推力拱座基础工程施工实践。全卵石孤漂石地质条件下冲击成墙法施工桩柱式地下连续墙在国内尚属首例。

After the exploration on the risk analysis of the well sinking as per the original design and comparison and selection of respective construction methdologies for the Continuous Diaphragm Wall, and the trial on feasibility for Continuous Diaphragm Wall formed by impaction, the article mainly expatiates the feasibility of forming wall under the special geological condition and possibility for water-stop at joints of formed wall. The method has been adopted to guide and facilitate the construction for thrust skewback foundation of LIUWU Bridge in Lhasa. It is the first time in Chinese domestic construction practise to successfully implement and complete continuous Diaphragm walls by the impaction construction methdology in the full scree and boulder geologic condition.