2篇
您的检索式：作者名="Fengwen Lai"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Undrained stability of pit-in-pit braced excavations under hydraulic uplift显示文摘Pit-in-pit(PIP)excavations in an aquifer–aquitard system likely undergo catastrophic failures under the hydraulic uplift,the associated undrained stability problem,however,has not been well analyzed in the past.To this end,a hypothetical model of PIP braced excavation in typical soil layers of Shanghai,China is developed using the finite element limit analysis(FELA)tool.The FELA solutions of safety factors(FSs)against hydraulic uplift are verified with the results from the finite element analysis with strength reduction technique(SRFEA)and existing design approaches.Subsequently,FELA is employed to identify the triggering and failure mechanisms of PIP braced excavations subjected to hydraulic uplift.A series of parametric studies considering the various geometric configurations of the PIP excavation,undrained shear strengths of aquitard,and artesian pressures are carried out.The sensitivities of relevant design parameters are further assessed using a multivariate adaptive regression splines(MARS)model that is capable of accurately capturing the nonlinear relationships between a set of input variables and output variables in multi-dimensions.A MARS-based design equation used for predicting FS is finally presented using the artificial dataset from FELA for practical design uses. | Fengwen Lai Fuquan Chen Songyu Liu Suraparb Keawsawasvong Jim Shiau | 2022 | Underground Space2022，7，6： | 1 |
| 2 | Physics-based and data-driven modeling for stability evaluation of buried structures in natural clays显示文摘This study presents a hybrid framework to predict stability solutions of buried structures under active trapdoor conditions in natural clays with anisotropy and heterogeneity by combining physics-based and data-driven modeling.Finite-element limit analysis(FELA)with a newly developed anisotropic undrained shear(AUS)failure criterion is used to identify the underlying active failure mechanisms as well as to develop a numerical(physics-based)database of stability numbers for both planar and circular trapdoors.Practical considerations are given for natural clays to three linearly increasing shear strengths in compression,extension,and direct simple shear in the AUS material model.The obtained numerical solutions are compared and validated with published solutions in the literature.A multivariate adaptive regression splines(MARS)algorithm is further utilized to learn the numerical solutions to act as fast FELA data-driven surrogates for stability evaluation.The current MARS-based modeling provides both relative importance index and accurate design equations that can be used with confidence by practitioners. | Fengwen Lai Jim Shiau Suraparb Keawsawasvong Fuquan Chen Rungkhun Banyong Sorawit Seehavong | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员