长江口深水航道治理工程地基土动三轴试验研究综述  

Summarization of Dynamic Triaxial Experimental Research on Foundation Soils for Yangtze Estuary Deepwater Channel Regulation Project

作　　者：闫澍旺[1] 熊志福[1] 范期锦 谢世楞[3] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]长江口航道管理局,上海200003 [3]中交第一航务工程勘察设计院,天津300222

出　　处：《水运工程》2006年第B12期148-152,158,共6页Port & Waterway Engineering

摘　　要：长江口导堤在建造期间遭到了强风暴的袭击,致使一部分沉箱结构发生了超量的沉降和位移。本文通过动三轴试验模拟了波浪荷载作用下地基强度特性的变化情况。试验结果显示,沉箱的过度沉陷和侧移主要是由于强风暴使得软黏土强度弱化所致。对排水板加堆载预压加固后的软土地基的强度特性进行了动三轴试验,结果表明加固后地基土抵抗强度弱化的能力大幅度提高,并在经受设计波浪荷载引起的动应力作用后,其强度仍能满足地基承载力要求。在加固的软土地基上对导堤进行了重建,重建后经历几次强风暴该导堤无损坏迹象,证明了试验结果的可靠性。During construction of the guiding dike in the Yangtze Estuary, some of the caisson structures appeared excess sinking into the soil or sliding away from the original place due to the attack of a strong storm. Dynamic triaxial tests were carried out to simulate the behavior of foundation soils under wave loading. The test results reveal that the excessive settlement and lateral movement of the caissons are due to strength weakening of soft clay during the strong storm. It is shown through the triaxial test on the strength of soft soil foundation after being improved by prefabricated plastic drain combining with surcharge loading that the wave resistance of soft clay is greatly increased after the foundation soil is strengthened and can satisfy the requirement on soil＂ s bearing capacity under the dynamic stress induced by the designed wave load. The dike reconstructed on the improved soil foundation experienced several strong storms without any damage. Thus practice has verified the reliability of the test result.

关 键 词：长江口 沉箱 软黏土 强度弱化 动三轴试验 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程]