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.
出处
《水运工程》
北大核心
2006年第B12期148-152,158,共6页
Port & Waterway Engineering
关键词
长江口
沉箱
软黏土
强度弱化
动三轴试验
the Yangtze Estuary
caisson
soft clay
strength weakening
dynamic triaxial test
