天津液化天然气管道填海段吹填土不均匀沉降量

Uneven Settlement of Soft Soil in Tianjin Liquefied Natural Gas Pipeline Reclamation

以天津液化天然气(LNG)管道填海段为例,对吹填土不均匀沉降问题进行研究,首先通过室内试验和现场原位静力触探实验(CPT)得到该填海段岩土层相关参数,对不均匀沉降成因进行分析。结果表明:吹填土对原始海床产生的附加应力是不均匀沉降的主要成因。然后采用分层总和法求得最终不均匀沉降量;并在此过程中对室内试验与现场原位结果差异性,以及不同沉降量计算方法进行讨论。最终选取最优计算方法;并在此计算结果基础上提出相应处理方案。

The problem of Tianjin liquefied natural gas(LNG)pipeline reclamation uneven settlement are discussed.Firstly through laboratory test and in-situ static penetration test(CPT)the rock and soil parameters of reclamation period was obtained.The causes of the uneven settlement were analyzed,and the results show that the additional stress generated by dredger fill on the original seabed is the main cause of uneven settlement.Then the summation method the finally uneven settlement are calculated by layer-wise summation method,and the difference results between laboratory tests and in-situ static penetration test and different settlement calculation methods are discussed in the process.Finally the optimal calculation method was choosed,and the deal was proposed based on calculation results.