Numerical Modeling of the Effect of a Weak Zone on the Bearing Capacity of Strip Footings

被引:0
作者
Walid Chaabani
Mohamed Saddek Remadna
Murad Abu-Farsakh
机构
[1] Biskra University,NMISSI Laboratory, Civil Engineering and Hydraulic Department
[2] Louisiana State University,Louisiana Transportation Research Center
来源
Geotechnical and Geological Engineering | 2023年 / 41卷
关键词
Bearing capacity; Nonhomogeneous soils; Strip footings; Weak zone; Numerical modeling;
D O I
暂无
中图分类号
学科分类号
摘要
This study presents the results of a comprehensive numerical modelling that was conducted to investigate the effect of different variables and parameters on the ultimate bearing capacity, qu, of strip footing on a sand layer underlying a clay deposit soil layer with a localized weak zone. The numerical model was developed using the finite difference FLAC2D software. The parameters investigated in this study are the thickness of the top sand layer, the undrained shear stress ratio of clay soil, and the location, depth, width, and height of the weak zone. The results clearly showed that the ultimate bearing capacity of strip footing, qu, decreases due to the presence of a weak zone, with the degree of reduction is a function of the soil properties and the weak zone parameters (depth, location and geometry), the value of qu increases with increasing the normalized thickness of the top sand layer, H/B, and with increasing the normalized vertical and horizontal distances of the weak zone (Yw/B, Xw/B). However, the qu value decreases significantly with increasing the normalized width and height of the weak zone (Bw/B, Hw/B) up to certain limits, where the reduction is negligible. However, the value of qu significantly increases with the increase in the shear strength of the clay layer, which indicates that higher shear strength of soil reduces the effect of the weak zone on qu, and therefore the weak zone has a different effect on different soil type and different soil strengths.
引用
收藏
页码:3897 / 3908
页数:11
相关论文
共 144 条
[1]  
Al-Tabbaa A(1989)Model tests of footings above shallow cavities Ground Eng 22 39-42
[2]  
Russell L(1997)Cavity effect on stability of strip footing in two-layer soils J Geotechn Eng 28 151-164
[3]  
O'Reilly M(1984)Stability of spread footing above void in clay J Geotech Eng 110 1591-1605
[4]  
Azam G(1983)Bearing capacity of strip footing above void J Geotech Eng 109 1-14
[5]  
Jao M(2017)Bearing capacity of foundations on soft clays with granular column and trench Soils Found 57 488-495
[6]  
Wang MC(1975)Bearing capacity test on reinforced earth slabs J Geotech Eng ASCE 101 1241e1255-700
[7]  
Badie A(1996)Discussion on bearing capacity of footings over two-layered foundation soils J Geotech Eng ASCE 122 699-14
[8]  
Wang MC(2022)Numerical modeling of the ultimate bearing capacity of strip footings on reinforced sand layer overlying clay with voids Infrastructures 8 3-289
[9]  
Baus RL(2022)Limit analysis solution for ultimate bearing capacity of footing resting on the rock mass with a circular void subjected to line loading Indian Geotech J 1 1-553
[10]  
Wang MC(2019)Reliability assessment on stability of tunnelling perpendicularly beneath an existing tunnel considering spatial variabilities of rock mass properties Tunn Undergr Space Technol 88 276-1704