Assessing foundation behaviour under complex loading near tunnels

作     者：Piyush KUMAR Vinay Bhushan CHAUHAN Aayush KUMAR 

作者机构：Civil Engineering DepartmentMadan Mohan Malaviya University of TechnologyGorakhpur 273010India 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2024年第21卷第10期

页      面：3503-3520页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：Civil Engineering Department Madan Mohan Malaviya University of Technology 

主　　题：Unlined tunnel Shallow foundation FELA Rock Mass ANN MLR 

摘      要：The stability of strip footings subjected to eccentrically inclined loads is critical for reliable foundation *** study investigates the effect of a circular unlined tunnel in a rock mass on the ultimate bearing capacity(UBC)of a foundation with width B under inclined and eccentric *** finite element limit analysis was employed to evaluate the reduction in UBC of the footing resting above a *** examined critical parameters include normalized load eccentricity(e/B),load inclination(β),and horizontal and vertical distances of the tunnel from the foundation(P/B and Q/B,respectively),along with rock mass *** results reveal that for e/B≥0.25 and≤60°,the reduction coefficient,Rc≥0.90,suggesting that the presence of a tunnel has a minimal impact on the load-bearing capacity of the footing,with failure primarily governed by load eccentricity and ***,potential failure mechanisms are explored,showing that at lower e/B,higherβ,and lower Q/B,the tunnel significantly affects footing s failure ***,at higher e/B and lowerβ,failure is due to rotational effects of footing,regardless of the tunnel s *** predict the Rc more accurately,due to the time-consuming nature of direct calculations,both MLR and ANN models were *** MLR model provided a baseline for comparison,while the ANN model,with a coefficient of determination(R2)of 0.98,demonstrated superior accuracy compared to the R2=0.96 of *** both approaches ensured robust and efficient predictions of *** Rc does not directly provide the reduced UBC of footing due to presence of tunnel,the study introduced bearing capacity factor(Nc)to enable direct calculation of the reduced UBC of *** findings offer theoretical guidelines for preliminary design and provide practitioners with an effective tool for evaluating UBC reduction in complex loading scenarios involving tunnels.