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在大型通用有限元软件ABAQUS平台上,通过二次开发,将软黏土的循环强度与D-P屈服准则相结合,基于拟静力分析建立了波浪循环作用下考虑软土地基弱化效应的大圆筒结构稳定性计算模型。结合某工程,对大圆筒结构的稳定性进行了分析。结果表明,考虑地基循环弱化效应时,大圆筒结构的稳定性安全系数显著降低;打设排水板对地基加固后,结构稳定性安全系数显著提高;在同一圆筒入土深度下,随着地基加固深度的增加,大圆筒结构稳定性安全系数明显增大。考虑地基循环弱化效应时大圆筒结构稳定性安全系数减小程度在30%左右,建议在实际设计中应考虑软土地基循环弱化效应对大圆筒结构稳定性的影响。同时在地基不满足承载要求时,打设排水板加固软土地基是提高大圆筒结构稳定性的有效途径。
Based on ABAQUS, a large general finite element software, the cyclic strength of soft clay is combined with DP yield criterion through secondary development. Based on the quasi-static analysis, the stability of the large cylinder structure considering the weakening effect of soft ground under the wave cycle is established Sexual Computation Model. Combined with a project, the stability of the large cylinder structure is analyzed. The results show that the safety coefficient of the stability of the large cylinder structure is significantly reduced when the weakening effect of the foundation is considered. The safety coefficient of the structural stability remarkably increases after the drainage plate is laid on the foundation. With the same depth of soil excavation, With the increase of depth, the safety coefficient of the stability of the large cylinder increases obviously. Considering the weakening effect of foundation cycle, the safety factor of the stability of the large cylinder structure is reduced by about 30%. It is suggested that the effect of soft soil foundation weakening on the stability of the large cylinder structure should be considered in practical design. At the same time, when the foundation does not meet the requirements of bearing, laying drainage board to reinforce soft soil foundation is an effective way to improve the stability of large cylinder structure.