海洋平台桩基注浆加固水泥土抗剪强度试验研究OA北大核心

To investigate the bearing capacity enhancement of offshore platform piles through cemented reinforce-ment,with a focus on cemented silt.A systematic experimental program involving 24 direct shear tests were carried out to quantify the coupled effects of cement content and consolidation pressure on shear strength evolution.The results showed that the shear strength of the specimens increased continuously with the cement content.The shear strength of the sample with a 15%cement content was increased by 140%-209%compared to uncemented silt,and that of the sample with a 25%cement content was increased by 160%-246%.The strength parameters of cemented soil(cohesion and friction angle)displayed a linearly increasing relationship with the cement content.At the same cement content,higher consolidation pressures improved particle interlocking between cement and soil,leading to increased shear strength.When the consolidation pressure was increased by 150 kPa under the same cement content,the cohesion increased by 6%-12.5%and the friction angle by 9.6%-14.3%.Numerical calculations for the bearing capacity of pile foundations at Chengdao Oilfield offshore platforms revealed that the ultimate bearing capacity increased from 2 967 kN(uncemented)to 5 379 kN(cemented),marking an 81.29%improvement.This demon-strates the significant efficacy of grouting technology in enhancing pile foundation performance.