检索结果-南通市图书馆

Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 899-911页

作者： Muhammad Nouman Amjad Raja sanjay kumar shukla Geotechnical and Geoenvironmental Engineering Research Group School of EngineeringEdith Cowan UniversityJoondalupPerthWA 6027Australia Department of Civil Engineering School of EngineeringUniversity of Management and TechnologyLahorePakistan Civil Engineering Department Delhi Technological UniversityDelhiIndia

In the recent past,the potential benefits of wraparound geosynthetic reinforcement technique for constructing the reinforced soil foundations have been *** paper presents the experimental study on the behaviour of model strip footing resting on sandy soil bed reinforced with geosynthetic in wraparound and planar forms under monotonic and repeated *** geosynthetic layers were laid according to the reinforcement ratio to minimise the scale *** is found that for the same amount of reinforcement material,the wraparound reinforced model resulted in less settlement in comparison to planar reinforced *** efficiency of wraparound reinforced model increased with the increase in load amplitude and the rate of total cumulative settlement substantially decreased with the increase in number of load *** wraparound reinforced model has shown about 45% lower average total settlement in comparison to unreinforced model,while the double-layer reinforced model has about 41% lower average total settlement at the cost of approximately twice the material and 1.5 times the occupied land width ***,wraparound models have shown much greater stability in comparison to their counterpart models when subjected to incremental repeated loading.

关键词： Geosynthetics Repeated loads Wraparound reinforcement technique Model tests Footing settlement Bearing capacity Reinforcement ratio Strip footing

Liquefaction proneness of stratified sand-silt layers based on cyclic triaxial tests

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2023年第7期15卷 1826-1845页

作者： Arpit Jain Satyendra Mittal sanjay kumar shukla Department of Civil Engineering Indian Institute of TechnologyRoorkeeUttarakhandIndia School of Engineering Edith Cowan UniversityJoondalupPerthAustralia Department of Civil Engineering Indian Institute of Technology MadrasChennaiIndia Department of Civil Engineering BIT SindriIndia

Most studies on liquefaction have addressed homogeneous soil strata using sand or sand with fine content without considering soil *** this study,cyclic triaxial tests were conducted on the stratified sand specimens embedded with the silt layers to investigate the liquefaction failures and void-redistribution at confining stress of 100 kPa under stress-controlled *** loosening of underlying sand mass and hindrance to pore-water flow caused localized bulging at the sand-silt *** is observed that at a silt thickness of 0.2H(H is the height of the specimen),nearly 187 load cycles were required to attain liquefaction,which was the highest among all the silt thicknesses with a single silt ***,0.2H is assumed as the optimum silt thickness(t_(opt)).The silt was placed at the top,middle and bottom of the specimen to understand the effect of silt layer *** to the increase in depth of the silt layer from the top position(capped soil state)to the bottom,the cycles to reach liquefaction(N_(cyc,L))increased 2.18 ***,when the number of silt layers increased from single to triple,there was an increase of about 880%in N_(cyc,L).The micro-characterization analysis of the soil specimens indicated silty materials transported in upper sections of the specimen due to the dissipated pore *** main parameters,including thickness(t),location(z),cyclic stress ratio(CSR),number of silt layers(n)and modified relative density(D_(r,m)),performed significantly in governing the lique-faction *** this,a multilinear regression model is developed based on critical parameters for prediction of N_(cyc,L).Furthermore,the developed constitutive model has been validated using the data from the present study and earlier findings.

关键词： Cyclic triaxial tests Soil stratification Soil liquefaction Regression model

Predicting and validating the load-settlement behavior of large-scale geosynthetic-reinforced soil abutments using hybrid intelligent modeling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2023年第3期15卷 773-788页

作者： Muhammad Nouman Amjad Raja Syed Taseer Abbas Jaffar Abidhan Bardhan sanjay kumar shukla Department of Civil Engineering School of EngineeringUniversity of Management and TechnologyLahorePakistan Department of Civil Engineering National Institute of Technology(NIT)PatnaPatnaBihar800005India Geotechnical and Geoenvironmental Research Group School of EngineeringEdith Cowan UniversityJoondalupPerthAustralia Department of Civil Engineering Delhi Technological UniversityDelhiIndia

Settlement prediction of geosynthetic-reinforced soil(GRS)abutments under service loading conditions is an arduous and challenging task for practicing geotechnical/civil ***,in this paper,a novel hybrid artificial intelligence(AI)-based model was developed by the combination of artificial neural network(ANN)and Harris hawks’optimisation(HHO),that is,ANN-HHO,to predict the settlement of the GRS *** other robust intelligent models such as support vector regression(SVR),Gaussian process regression(GPR),relevance vector machine(RVM),sequential minimal optimisation regression(SMOR),and least-median square regression(LMSR)were constructed and compared to the ANN-HHO *** predictive strength,relalibility and robustness of the model were evaluated based on rigorous statistical testing,ranking criteria,multi-criteria approach,uncertainity analysis and sensitivity analysis(SA).Moreover,the predictive veracity of the model was also substantiated against several large-scale independent experimental studies on GRS abutments reported in the scientific *** acquired findings demonstrated that the ANN-HHO model predicted the settlement of GRS abutments with reasonable accuracy and yielded superior performance in comparison to counterpart ***,it becomes one of predictive tools employed by geotechnical/civil engineers in preliminary decision-making when investigating the in-service performance of GRS ***,the model has been converted into a simple mathematical formulation for easy hand calculations,and it is proved cost-effective and less time-consuming in comparison to experimental tests and numerical simulations.

关键词： Geosynthetic-reinforced soil(GRS) abutments Settlement estimation Predictive modeling Artificial intelligence(AI) Artificial neural network(ANN)-Harris hawks’optimisation(HHO)

Responses of calcareous sand foundations to variations of groundwater table and applied loads

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1266-1279页

作者： Dingfeng Cao sanjay kumar shukla Linqing Yang Chengchao Guo Jinghong Wu Fuming Wang School of Civil Engineering Sun Yat-sen UniversityGuangzhou510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519082China Discipline of Civil and Environmental Engineering School of EngineeringEdith Cowan UniversityPerth6027Australia School of Architectural Engineering Guangzhou Institute of Science and TechnologyGuangzhou510540China School of Civil Engineering Suzhou University of Science and TechnologySuzhou215011China

The long-term settlement of calcareous sand foundations caused by daily periodic fluctuations has become a significant geological hazard,but effective monitoring tools to capture the deformation profiles are still rarely *** this study,a laboratory model test and an in situ monitoring test were *** optical frequency domain reflectometer(OFDR)with high spatial resolution(1 mm)and high accuracy(10-6)was used to record the soil strain responses to groundwater table and varied *** results indicated that the fiber-optic measurements can accurately locate the swelling and compressive *** the loading process,the interlock between calcareous sand particles was detected,which increased the internal friction angle of *** foundation deformation above the sliding surface was dominated by compression,and the soil was continuously compressed beneath the sliding *** 26e48 h,calcareous sand swelling occurred gradually above the water table,which was primarily dependent on capillary *** swelling of the soil beneath the groundwater table was completed rapidly within less than 2 *** the groundwater table and load remain constant,the compression creep behavior can be described by the Yasong-Wang model with R2¼*** daily periodically varying in situ deformation of calcareous sand primarily occurs between the highest and lowest groundwater tables,i.e.4.2e6.2 m *** tuff interlayers with poor water absorption capacity do not swell or compress,but they produce compressive strain under the influence of deformed calcareous sand layers.

关键词： Distributed fiber optic sensing(DFOS) Calcareous sand Optical fiber Optical frequency domain reflectometer (OFDR) Soil foundation settlement

Load-Bearing Capacity of the Footing Resting on a Reinforced Fly Ash Slope

在线全文

学校读者我要写书评

暂无评论

Journal of Civil Engineering and Architecture 2012年第5期6卷 627-632页

作者： Kulbir Singh Gill Anil kumar Choudhary Jagada Nand Jha sanjay kumar shukla Civil Engineering Department Guru Nanak Dev Engineering College Ludhiana Punjab India Civil Engineering Department National Institute of Technology Jamshedpur Jharkhand India Discipline of Civil Engineering School of Engineering Edith Cowan University Joondalup WA 602 7 Australia

In several parts of the world, disposal of waste materials such as fly ash is a great problem. Application of waste materials as structural fills in foundations is one of the best solutions to disposal problems, because wastes can be used in large volumes in such applications. There may be difficulty due to poor load-bearing capacity of fly ash, especially when footing rests on the top of the fly ash fill slope. Inclusion of polymeric reinforcements as horizontal sheets within the fill may be one of the most viable solutions to improving the load-bearing capacity of reinforced fly ash slope, and it is particularly important for the situations where foundations need to be located either on the top of a slope or on slope itself. The present work is aimed at investigating the efficacy of a single layer of reinforcement in improving the lo, ad-bearing capacity when it gets incorporated within the body of a model fly ash embankment slope. An increase in load bearing capacity due to the incorporation of reinforcement in the model slope was found by conducting laboratory tests. Experimental results were compared by numerical values obtained using software GEO5 and PLAXIS.

关键词： Reinforced fly ash slope polymeric reinforcement load bearing capacity numerical analysis.

Analytical expressions for determining the stability of cohesionless soil slope under generalized seismic conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2018年第7期15卷 1559-1571页

作者： SAHOO Pragyan Pradatta shukla sanjay kumar MOHYEDDIN Alireza Discipline of Civil and Environmental Engineering School of Engineering Edith Cowan University Joondalup PerthWA 6027 Australia Fiji National University Suva Fiji and Chitkara University Himachal Pradesh India

In recent major earthquakes, the researchers have found the need for consideration of vertical seismic acceleration for the stability analysis of the man-made and natural slopes. However, in most past studies, the performance of slopes has been assessed by accounting only the horizontal seismic component of the ground motion, without giving due weightage to the effect of vertical component. In the present study, analytical expressions are derived to determine the factor of safety, yield seismic coefficient and consequently the seismic displacement of cohesionless soil slope under combined horizontal and vertical components of the ground motion. The derivation uses the Newmark's sliding block approach, in which the soil slope with a planar failure surface within the framework of conventional pseudo-static analysis is assumed to follow the Mohr-Coulomb failure criterion. The effects of vertical seismic coefficient on the stability of cohesionless slope have been studied through a set of graphical presentations for a specific range of soil parameters. It is observed that overlooking the effect of the vertical component of the ground motion on factor of safety and the displacement while designing the slope may be detrimental, resulting in the slope failure. The general expressions presented in this paper may be highly useful in the field of earthquake geotechnical engineering practice for designing the cohesionless soil slopes under combined horizontal and vertical seismic loads.

关键词： Factor of safety Horizontal and vertical seismic coefficients Soil slopes Yield acceleration Sliding block displacement Seismic slope stability

Load-settlement behaviour of a strip footing resting on iron ore tailings as a structural fill

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2016年第2期26卷 247-253页

作者： Kuranchie Francis Atta shukla sanjay kumar Habibi Daryoush Kazi Monir School of Engineering Edith Cowan University 270 Joondalup Drive Joondalup WA 6027 Australia

This study presents a laboratory investigation of load-settlement behaviour of a strip footing resting on iron ore tailings used as a structural *** footing was placed at various depths in the tailings *** relative density of the tailings was varied as D_r = 50%,70%and 90%.An incremental load was applied on the footing while observing the settlement until the failure took *** results obtained for tailings were compared with those for the sandy *** is observed that the load-bearing capacity and stiffness increase with an increase in footing embedment depth and relative *** to load-settlement behaviour of Perth sandy soil,the tailings fill could have as high as 22 times and 13.5 times the load-bearing capacity and stiffness,***,the replacement of sandy soil with iron ore tailings for structural fills is cost-effective,and moreover,this application contributes to environmental sustainability in construction.

关键词： Iron ore mine tailings Footing Settlement Load-bearing capacity Modulus of subgrade reaction

A multiplicative Gauss-Newton minimization algorithm:Theory and application to exponential functions

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2021年第3期36卷 370-389页

作者： Anmol Gupta sanjay kumar Department of Electronics and Communication Engineering Thapar Institute of Engineering and TechnologyPatiala 147004India

Multiplicative calculus(MUC)measures the rate of change of function in terms of ratios,which makes the exponential functions significantly linear in the framework of ***,a generally non-linear optimization problem containing exponential functions becomes a linear problem in *** this as motivation,this paper lays mathematical foundation of well-known classical Gauss-Newton minimization(CGNM)algorithm in the framework of *** paper formulates the mathematical derivation of proposed method named as multiplicative Gauss-Newton minimization(MGNM)method along with its convergence *** proposed method is generalized for n number of variables,and all its theoretical concepts are authenticated by simulation *** case studies have been conducted incorporating multiplicatively-linear and non-linear exponential *** simulation results,it has been observed that proposed MGNM method converges for 12972 points,out of 19600 points considered while optimizing multiplicatively-linear exponential function,whereas CGNM and multiplicative Newton minimization methods converge for only 2111 and 9922 points,***,for a given set of initial value,the proposed MGNM converges only after 2 iterations as compared to 5 iterations taken by other methods.A similar pattern is observed for multiplicatively-non-linear exponential ***,it can be said that proposed method converges faster and for large range of initial values as compared to conventional methods.

关键词： multiplicative calculus multiplicative least square method multiplicative Newton minimization multiplicative Gauss-Newton minimization non-linear exponential functions

Handling higher order time series forecasting approach in intuitionistic fuzzy environment

在线全文

学校读者我要写书评

暂无评论

Journal of Control and Decision 2020年第4期7卷 327-344页

作者： Abhishekh sanjay kumar Department of Mathematics Institute of ScienceBanaras Hindu UniversityVaranasi 221005India

This study presents a new method of forecasting based on a higher order intuitionistic fuzzy time series(FTS)by transforming FTS data into intuitionistic FTS data via defining their appropriate membership and non-membership *** fuzzification of time series data is intuitionistic fuzzification which is based on the maximum score degree of intuitionistic fuzzy ***,the intuitionistic fuzzy logical relationship groups are defined and introduced into a defuzzification process for a higher order intuitionistic FTS that enhances in the forecasted *** order to assess the performance of the proposed method,the method has been implemented on the historical data of rice *** comparison result shows that the proposed method can achieve a better forecasting accuracy rate in terms of RMSE and MAPE than the existing methods such as Song and Chissom[(1993).Forecasting enrolments with fuzzy time series-Part *** Sets and System,54,1-9],Chen[(1996).Forecasting enrolments based on fuzzy time *** Sets and System,81,311-319],Singh[(2007a).A simple method of forecasting based on fuzzy time *** Mathematics and Computation,186,330-339]and Abhishekh,Gautam,and Singh[(2017).A refined weighted method for forecasting based on type 2 fuzzy time *** Journal of ModellingandSimulation,38,180-188;(2018).A score function based method of forecasting using intuitionistic fuzzy time *** Mathematics and Natural Computation,14(1),91-111].

关键词： Fuzzy time series intuitionistic fuzzy number membership grades accuracy function higher order IFLR

Quadrature Based Optimal Iterative Methods with Applications in High-Precision Computing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2012年第4期5卷 592-601页

作者： sanjay kumar Khattri Stord/Haugesund University College Department of EngineeringHaugesundNorway

We present a simple yet effective and applicable scheme,based on quadrature,for constructing optimal iterative *** to the,still unproved,Kung-Traub conjecture an optimal iterative method based on n+1 evaluations could achieve a maximum convergence order of *** quadrature,we develop optimal iterative methods of orders four and *** scheme can further be applied to develop iterative methods of even higher *** results demonstrate that the developed methods are efficient as compared with many well known methods.

关键词： Iterative methods fourth order eighth order quadrature Newton convergence nonlinear optimal