堤防填筑荷载下地基土体变形特征试验研究

Experimental study on deformation properties of soils under dike filling loads

结合甬江防洪堤东江奉化段堤防整治工程东江左岸11+707~12+487试验段实体工程,进行了堤防填筑荷载下地表沉降、地基土体侧向位移以及分层沉降的现场试验研究,获得了分级加载条件下地表沉降规律、场区土层的极限承载高度、地基土体的侧向变形和分层沉降的变化规律。试验数据分析表明:本试验段地基经过水泥土搅拌桩处理后,土层极限加载高度和侧向位移未得到明显改善;当在超软土地基上修建堤防时,地基工后沉降量起主导作用;为确保堤防的防洪标准,应该充分考虑预留沉降量。

Combining the left bank of Yongjiang physical works from 11 + 707 to 12 + 487 testing section in Fenghua East River levees of Yong River renovation,the field tests on the surface settlement,lateral displacement,and layered settlements under the dike filling loads are carried out. The variations of the surface settlement,the ultimate bearing height of the field soils,the lateral displacement of soils and the layered settlements under the stage loads are obtained. The analysis of the test data illustrates that the ultimate bearing height and lateral movement of soils are not significantly improved after the foundation soils are reinforced by using cement mixing piles; the post-construction settlement plays the dominant role as the dike embankment built on the super soft soils; in order to ensure the flood control standard,the reverse settlement should be taken fully into account.