张云鹏,王宗琴,宗梦繁,吴文兵,王立兴

• 1:中国地质大学(武汉)工程学院
• 2:中国地质大学(武汉)浙江研究院

摘要(Abstract)：

新近吹填地基的固结效应十分显著，地基土内超静孔隙水压力的消散将引起地表的整体沉降，对吹填地基上基础工程的稳定性产生不利影响。基于连续排水边界，综合考虑吹填土的自重和下伏原状海床的成层特性，建立了吹填土自重驱动下的吹填地基-原状海床一维固结方程，并基于本征函数法推导了孔隙水压力响应、固结度等的解析解。通过边界条件和模型的退化，验证了解答的正确性。利用该解答讨论了吹填土自重、成层地基模量、时间因数、地表附加荷载等时空条件对吹填地基固结沉降的影响。研究结果表明：(1)吹填土自重是吹填地基固结的驱动因素，在实际工程中不可忽略；(2)土体渗透系数对超静孔隙水压力的影响较为复杂，某一层土的渗透性改变后，对其上覆和下伏土层的超静孔隙水压力将产生相反的影响；(3)土层的体积压缩系数对超静孔隙水压力的影响十分显著，且深部土体的体积压缩系数影响更大；(4)地表堆载等引起的附加荷载会减缓超静孔隙水压力的消散。

关键词(KeyWords)： 成层吹填地基;一维固结;连续排水边界;自重;解析解

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(52178371);; 浙江省杰出科学基金项目(LR21E080005)

作者(Author): 张云鹏,王宗琴,宗梦繁,吴文兵,王立兴

DOI: 10.19509/j.cnki.dzkq.2022.0171

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