海上静力触探贯入机理的有限元研究

Study on Offshore CPT Penetration Mechanism by Finite Element Model

工程地质评价是海洋石油平台建设的关键环节。由于深海区的环境条件比较复杂,近年来我国在深海区原位地质勘察方面刚刚起步。由于海床静力触探和井下静力触探的勘察方法和操作工艺不同,获得的锥端阻力也存在一定差异。采用有限元模拟法分析海床静力触探和井下静力触探的贯入机理,并计算不同静力触探模式下的锥端阻力,发现在静力触探过程中周围土体存在不同的位移模式。

Engineering geological evaluation is regarded as a key point for the construction offshore oil platform. Due to the complicated environmental conditions of deep-sea zone, In-situ geological survey has just been developed in China for recent years. The survey method and construction technologies of seabed CPT are different from that of down-hole CPT, which results in the discrepancy between the cone tip resistances. Now the above cone tip resistance and penetration mode are calculated and analyzed by using finite element model. The calculation results show different soil deformation in the process of CPT.