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钱塘江流域正在开展大规模的建设,河口两岸海塘、江边基坑面临洪水、强潮的严重侵袭。选择钱塘江土海塘典型地质剖面和砼海塘典型地质剖面,考虑钱塘江粉土的剪胀性,采用Hardening-Soil本构模型,数值研究潮位及离江距离、围护墙嵌固深度、开挖深度对基坑安全性的影响,分析江边粉土基坑破坏模式。结果表明:高潮位下,土海塘典型地质剖面的江边基坑,可能出现海塘先于基坑破坏的模式;基坑开挖深度较小时,支护结构整体向坑内倾倒破坏;基坑开挖深度较大,呈踢脚破坏模式。坑底边旁在距围护墙的嵌固深度一半范围内,容易发生流土破坏。
Qiantang River Basin is undergoing large-scale construction, both sides of the mouth of the estuary, river foundation pit facing floods, strong tide of a serious invasion. Taking the typical geological section of Qiantangjiang Tuhaitang and the typical geological section of concrete seawall, considering the dilatancy of Qiantangjiang silt, the Hardening-Soil constitutive model was used to study the tidal level and distance from the river, Depth of the impact of the safety of foundation pit, analysis of the collapse of the foundation pit of the river. The results show that under the high tide level, the foundation pit of the typical geological section in Tuhai Tang may have a pattern of seawall pre-excavation damage. When the excavation depth is small, the whole supporting structure will be torn down into the pit, Depth larger, was Kick damage mode. Near the bottom of the pit is within half the depth of the embedding depth of the retaining wall, so that the flow of soil may easily occur.