深厚吹填软土区复合地基沉降控制技术研究

Settlement control technology of composite foundation in deep dredged soft soil

沿海地区深厚吹填软土区修建工程通常会遇到沉降量大和差异沉降较大的问题,这不仅给桥梁等结构施工带来困难,同时也可能在日后运营期间产生地基不均匀沉降、表面开裂等问题。应对这样的研究背景,对地基进行加固处理是非常必要的。基于台州新区某桥梁项目的勘察资料,利用有限元软件MIDAS-GTS-NX建立三维模型,对预实施施工工况进行数值模拟,并将模拟结果进行分析。结果表明:采用高压旋喷桩加固软土地基,可有效控制地基沉降;在桩身长度超出一个阀值后,桩长对软土地基的沉降控制效果会减弱。

Projects in deep dredged soft soil in coastal areas usually encounter problems of large and differential settlement,which not only bring difficulties to the construction of bridges and other buildings,but may also cause uneven settlement of the foundation and surface cracking during the life of the bridge.In these cases,it is necessary to reinforce the foundation.Based on the survey data of a bridge project in Taizhou New District,a three-dimensional model was established by using the finite element software MIDAS-GTS-NX.The pre-implemented construction conditions were numerically simulated,and the simulation results were analyzed.The results showed that the settlement of soft soil foundation could be effectively controlled by using high-pressure jet grouting pile.When the length of pile exceeds a threshold value,the settlement control of pile length on soft soil foundation will be weakened.