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自升式钻井船插桩对邻近平台桩基础的影响主要体现为插桩导致的土体大变形会使邻近平台桩基础受到附加水平荷载。当钻井船插桩时的桩靴边缘与邻近平台桩外缘之间间距小于1倍桩靴直径时,就需要定量评价钻井船插桩对邻近平台桩的影响程度。本文基于分析被动桩响应的两段法原理,通过开发ABAQUS中分析材料大变形的网格重新划分算法与相应的计算结果后处理方法,CEL计算结果的后处理方法,形成了求解钻井船在自由场地插桩时周围土体极大变形的有限元算法;进而,依据计算出的自由场地土体位移,采用增量有限差分方法求解非线性地基梁控制方程,即可获得钻井船插桩时的邻近桩桩身响应。以上形成了一种能够定量分析钻井船插桩对邻近桩影响的两段法。利用此方法预测已有的离心模型试验结果,获得了与实测结果基本吻合的预测结果。这表明本文建立的用于分析钻井船插桩对邻近桩影响的两段法是可行的。
The effect of self-elevating drilling vessel instrumentation on the adjacent platform pile foundation is mainly reflected by the large deformation of the soil caused by the instrumentation, which can cause additional horizontal load on the adjacent platform pile foundation. When the distance between the edge of the pile shoe and the outer edge of the adjacent platform pile when the drilling vessel is inserted is less than 1 times the diameter of the pile shoe, it is necessary to quantitatively evaluate the influence of the drilling vessel pile on the adjacent platform pile. In this paper, based on the two-stage method of analyzing the response of passive piles, by developing a mesh re-partitioning algorithm for analyzing large deformation of materials in ABAQUS, corresponding post-processing methods of calculation results and post-processing methods of CEL calculation results, The finite element method of great deformation of the soil around the pile when pile is inserted into the pile and the finite element method of the deformation of the soil around the pile when the pile is inserted. Adjacent pile shaft response. The above results in a two-stage method that can quantitatively analyze the effect of drilling vessel instrumentation on adjacent piles. Using this method to predict the results of the existing centrifugal model test, the prediction results are basically consistent with the measured results. This shows that the two-stage method established in this paper for analyzing the effect of drilling vessel instrumentation on adjacent piles is feasible.