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稳态流下非饱和土地基承载力模型
陈茜1, 程大伟2,3
1.陕西理工大学 土木工程与建筑学院, 陕西 汉中 723001;2.长安大学 环境科学与工程学院;3.旱区地下水文与生态效应教育部重点实验室, 西安 710064
摘要:
基于稳态流下吸应力剖面具有明显非线性的特点,在仅考虑竖向稳定渗流条件下,通过补充普朗德尔假定,利用刚体平衡方法,推导普朗德尔滑动面范围内滑动土体稳态流下非饱和土地基的极限承载力计算模型,讨论地下水埋深和比流量变化对地基极限承载力的影响。结果表明:稳态流下非饱和土地基的极限承载力公式考虑了滑动土体内吸应力非线性分布特点对地基极限承载力的影响;当土体内吸应力随深度增加呈现出先增大后减小的特点时,地基极限承载力随地下水位埋深减小呈先减后增的变化趋势;当滑动土体内吸应力随比流量的增大呈现先增后减的趋势时,地基极限承载力呈现先减小再增大的变化趋势。
关键词:  稳态流  非饱和土  地基承载力  地下水
DOI:10.11835/j.issn.1674-4764.2018.06.002
分类号:TU431
基金项目:国家自然科学基金(41602237);中央高校基本科研业务费(310829161011)
Bearing capacity model for foundations of unsaturated soil under steady flow condition
Chen Xi1, Cheng Dawei2,3
1.School of Civil Engineering and Architecture, Shaanxi University of Technology, Hanzhong 723001, Shaanxi, P. R. China;2.School of Environmental Science and Engineering;3.Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, Xi'an 710064, P. R. China
Abstract:
The suction stress profile is of obvious nonlinear characteristics under steady flow condition. This study supplemented the Prandtl assumption under the condition of considering the single vertical seepage and deduced the calculation model of bearing capacity for foundation of unsaturated soil under steady flow condition by means of rigid body balance method in the range of Prandtl sliding surface. It also discussed the influence of change of the groundwater and ratio flow on bearing capacity. The results show that the bearing capacity formula of unsaturated soil foundation under steady flow can take into account the influence of the nonlinear distribution of the soil suction stress; when suction stress increases firstly, and then decreases with the depth, the bearing capacity decreases first, and then increases as groundwater lever is lowered.
Key words:  steady state flow  unsaturated soil  foundation bearing capacity  groundwater
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