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水蚀风蚀交错区黄土抗剪强度敏感性分析

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Indexed by:期刊论文

Date of Publication:2018-01-01

Journal:水土保持研究

Included Journals:CSCD

Volume:25

Issue:3

Page Number:23-28

ISSN No.:1005-3409

Key Words:抗剪强度;干密度;含水量;敏感性分析;重力侵蚀

Abstract:抗剪强度不仅是黄土重要的力学性质指标,还是控制重力侵蚀的内在因素.利用直剪仪进行快剪试验,研究干密度和含水量对黄土抗剪强度的影响,并用基于变量增长率的敏感性分析方法,对抗剪强度的影响因素进行了敏感性分析.结果表明:干密度是通过影响粘聚力和内摩擦角来影响抗剪强度的,而含水量仅仅通过影响粘聚力来影响抗剪强度.含水量对粘聚力的影响呈指数函数减小,而对内摩擦角影响很小,含水量对粘聚力的影响程度是其对内摩擦角的18.5倍.黄土抗剪强度对干密度的敏感性大于它对含水量的敏感性,前者的敏感系数是后者的10倍.可为黄土沟坡重力侵蚀的力学机理分析提供参考依据.

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