Impact of Transient Infiltration on the Ultimate Bearing Capacity of Obliquely and Eccentrically Loaded Strip Footings on Partially Saturated Soils

岩土工程 承载力 土壤水分 饱和(图论) 饱和度 渗透(HVAC) 地质学 有效应力 抽吸 屈服面 有限元法 土壤科学 数学 工程类 材料科学 结构工程 本构方程 复合材料 组合数学 机械工程
作者
Hessam Fathipour,Shahla Bahmani Tajani,Meghdad Payan,Reza Jamshidi Chenari,Kostas Senetakis
出处
期刊:International Journal of Geomechanics [American Society of Civil Engineers]
卷期号:23 (2) 被引量:16
标识
DOI:10.1061/ijgnai.gmeng-7463
摘要

Soils above the groundwater table and near the ground surface are often partially saturated, and the changes in the degree of saturation and matric suction caused by infiltration may have substantial effects on the stability of geotechnical systems. This work evaluates the significant effect of transient flow on the ultimate bearing capacity of strip footings founded on unsaturated soils under the simultaneous actions of vertical and horizontal loads and moment using the lower-bound theorems of the finite-element limit analysis and the incorporation of second-order cone programming. The unified effective stress theory is incorporated into the soil yield function to model the partially saturated state, and the closed-form solution for one-dimensional transient flow is adopted so as to evaluate the tempo-spatial variations of suction stress. For both sand and clay underlying soils, it is found that the increase of infiltration time leads to a notable decrease of the size of the normalized failure envelopes for either obliquely or eccentrically loaded shallow foundations. The impact of transient flow on the ultimate bearing capacity of surface footings is also observed to be greater for clay soils as compared with sand deposits due to the significant contribution of higher induced suction stress.
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