秦卫星;胡惠仁;廖紫欣;李蕾;吴卫东;

• 1:长沙理工大学水利工程学院
• 2:水沙科学与水灾害防治湖南省重点实验室
• 3:湖南省水利水电勘测设计研究总院
• 4:田纳西大学查塔努加分校土木与化学工程系

摘要(Abstract)：

为确定降雨入渗过程影响均质地基基质吸力演化的主导因素，首先基于BP神经网络建立饱和渗透系数、去饱和系数、储水能力、降雨强度和降雨历时5个影响因素与基质吸力分布改变量之间的非线性映射关系模型，并采用Levenberg-Marquardt算法进行神经网络训练，得到隐含层与输入层、输出层之间的连接权值。然后利用Olden方法处理神经网络的连接权值，获得各因素对基质吸力分布改变影响显著性的量化值表达式，建立了降雨入渗作用下地基基质吸力影响因素显著性分析的BP-Olden方法。最后以概化均质地基模型为研究对象进行算例分析，结果表明，地基基质吸力分布改变主要受土体去饱和系数和土体储水能力影响，降雨强度和降雨历时的影响显著性次之，土体饱和渗透系数的影响最小。研究成果为采用针对性地基土体性能改良措施来降低雨水入渗引起的不良影响提供了技术支持。

关键词(KeyWords)： 安全工程;均质地基;基质吸力;BP神经网络;Olden方法;显著性分析

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51208062,51508039);; 湖南省交通科技计划项目(201140);; 2019年湖南省研究生科研创新项目(CX20190680)

作者(Authors): 秦卫星;胡惠仁;廖紫欣;李蕾;吴卫东;

DOI: 10.13637/j.issn.1009-6094.2020.1053

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