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Limit load and failure mechanisms of a vertical Hoek-Brown rock slope

Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 1106-1111页

作者： Jim Shiau Warayut Dokduea Suraparb Keawsawasvong pitthaya jamsawang School of Engineering University of Southern QueenslandToowoomba4350QLDAustralia Department of Civil Engineering Faculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkokThailand Research Unit in Sciences and Innovative Technologies for Civil Engineering Infrastructures Department of Civil EngineeringThammasat School of EngineeringThammasat UniversityPathumthani12120Thailand Soil Engineering Research Center Department of Civil EngineeringKing Mongkut’s University of Technology North BangkokBangkok10800Thailand

The problem considered in this short note is the limit load determination of a vertical rock *** classical limit theorem is employed with the use of adaptive finite elements and nonlinear programming to determine upper and lower bound limit loads of a Hoek-Brown vertical rock *** objective function of the mathematical programming problem is such as to optimize a boundary load,which is known as the limit load,resembling the ultimate bearing capacity of a strip *** focusing on the vertical slope,parametric studies are carried out for several dimensionless ratios such as the dimensionless footing distance ratio,the dimensionless height ratio,and the dimensionless rock strength ratio.A comprehensive set of design charts is presented,and failure envelopes shown with the results explained in terms of three identified failure mechanisms,*** face,the toe,and the Prandtl-type *** novel results can be used with great confidence in design practice,in particularly noting that the current industry-based design procedures for the presented problem are rarely found.

关键词： Bearing capacity Rock slope Vertical slope Finite element limit analysis Hoek-Brown yield criterion

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Improved prediction of pile bending moment and deflection due to adjacent braced excavation

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Frontiers of Structural and Civil Engineering 2023年第11期17卷 1739-1759页

作者： Chana PHUTTHANANON Pornkasem JONGPRADIST Duangkamol SIRIRAK Prateep LUEPRASERT pitthaya jamsawang Construction Innovations and Future Infrastructures Research Center Department of Civil EngineeringFaculty of EngineeringKing Mongkut's University of Technology ThonburiBangkok 10140Thailand Department of Civil Engineering School of EngineeringKing Mongkut's Institute of Technology LadkrabangBangkok 10520Thailand Soil Engineering Research Center Department of Civil EngineeringKing Mongkut's University of Technology North BangkokBangkok10800Thailand

Deep excavations in dense urban areas have caused damage to nearby existing structures in numerous past construction *** assessment is crucial in the initial design *** study develops equations to predict the existing pile bending moment and deflection produced by adjacent braced *** parameters(i.e.,the excavation geometry,diaphragm wall thickness,pile geometry,strength and small-strain stiffness of the soil,and soft clay thickness)were considered and employed in the developed *** is practically unfeasible to obtain measurement data;hence,artificial data for the bending moment and deflection of existing piles were produced from well-calibrated numerical analyses of hypothetical cases,using the three-dimensional finite element *** developed equations were established through a multiple linear regression analysis of the artificial data,using the transformation *** addition,the three-dimensional nature of the excavation work was characterized by considering the excavation corner effect,using the plane strain ratio *** estimation results of the developed equations can provide satisfactory pile bending moment and deflection data and are more accurate than those found in previous studies.

关键词： pile responses excavation prediction deflection bending moments

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Reliability-based settlement analysis of embankments over soft soils reinforced with T-shaped deep cement mixing piles

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Frontiers of Structural and Civil Engineering 2022年第5期16卷 638-656页

作者： Chana PHUTTHANANON Pornkasem JONGPRADIST Daniel DIAS Xiangfeng GUO pitthaya jamsawang Julien BAROTH Construction Innovations and Future Infrastructures Research Center Department of Civil EngineeringFaculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkok 10140Thailand 3SR Laboratory Grenoble INPFrench National Centre for Scientific Research(CNRS)Grenoble Alpes UniversityGrenoble 38000France Antea Group Antony 92160France Soil Engineering Research Center Department of Civil EngineeringKing Mongkut’s University of Technology North BangkokBangkok 10800Thailand

This paper presents a reliability-based settlement analysis of T-shaped deep cement mixing(TDM)pile-supported embankments over soft *** uncertainties of the mechanical properties of the in-situ soil,pile,and embankment,and the effect of the pile shape are considered *** analyses are performed using Monte Carlo Simulations in combination with an adaptive Kriging(using adaptive sampling algorithm).Individual and system failure probabilities,in terms of the differential and maximum settlements(serviceability limit state(SLS)requirements),are *** reliability results for the embankments supported by TDM piles,with various shapes,are compared and discussed together with the results for conventional deep cement mixing pile-supported embankments with equivalent pile *** influences of the inherent variabilities in the material properties(mean and coefficient of variation values)on the reliability of the piled embankments,are also *** study shows that large TDM piles,particularly those with a shape factor of greater than 3,can enhance the reliability of the embankment in terms of SLS requirements,and even avoid unacceptable reliability levels caused by variability in the material properties.

关键词： T-shaped deep cement mixing piles piled embankments settlement reliability analysis soil uncertainties

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Numerical investigation on the responses of existing single piles due to adjacent twin tunneling considering the lagging distance

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Underground Space 2023年第4期11卷 171-188页

作者： Chana Phutthananon Somkiat Lertkultanon Pornkasem Jongpradist Ochok Duangsano Suched Likitlersuang pitthaya jamsawang Construction Innovations and Future Infrastructures Research Center Department of Civil EngineeringFaculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkok 10140Thailand Geotechnical and Foundation Engineering Co. LtdBangkok 10230Thailand Centre of Excellence in Geotechnical and Geoenvironmental Engineering Department of Civil EngineeringFaculty of EngineeringChulalongkorn UniversityBangkok 10330Thailand Soil Engineering Research Center Department of Civil EngineeringKing Mongkut’s University of Technology North BangkokBangkok 10800Thailand

This paper presents an assessment of the influence of the lagging distance between two horizontal tunnel faces of the side-by-side twin tunnels on the responses of the adjacent existing single pile by a series of three-dimensional numerical *** different relative positions between the pile tip and the tunnel are considered to cover the short and long pile *** responses of the existing pile in terms of pile head settlement,axial force,lateral movement and bending moment are considered and *** numerical results indicate that the lagging distance between twin tunnel faces significantly affects not only the soil movements but also the responses of the existing single *** critical case that produces unsatisfactory pile responses due to twin tunneling is when the lagging distance between the second tunnel and the preceding tunnel equals to the shield *** is recommended that the lagging distance be not less than three times of shield length when the two tunnels need to be concurrently excavated.

关键词： Twin tunnels Tunnel lagging distance Existing pile Finite element analysis Pile responses

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Reliability assessment for serviceability limit states of stiffened deep cement mixing column-supported embankments

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2402-2422页

作者： Chana Phutthananon Pornkasem Jongpradist Kangwan Kandavorawong Daniel Dias Xiangfeng Guo pitthaya jamsawang Construction Innovations and Future Infrastructures Research Center Department of Civil EngineeringFaculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkok10140Thailand Laboratory 3SR Grenoble INPCNRSGrenoble Alpes UniversityGrenoble38000France Department of Civil and Environmental Engineering National University of SingaporeSingapore119077Singapore Soil Engineering Research Center Department of Civil EngineeringKing Mongkut’s University of Technology North BangkokBangkok10800Thailand

The reliability and deterministic analyses of wood-cored stiffened deep cement mixing and deep cement mixing column-supported embankments(referred to as WSCSE and DCSE,respectively)considering serviceability limit state requirements are presented in this *** field theory was used to simulate the spatial variability of soilcement mixing(SCM)material in which the adaptive Kriging Monte Carlo simulation was adopted to estimate the failure probability of a columnsupported embankment(CSE)system.A new method for stochastically generating random values of unconfined compressive strength(qu)and the ratio(Ru)between the undrained elastic modulus and qu of SCM material based on statistical correlation data is *** performance of CSEs concerning changes in the mean(μ),coefficient of variation(CoV),and vertical spatial correlation length(θv)of qu and Ru are presented and *** obtained results indicate that WSCSE can provide a significantly higher reliability level and can tolerate more SCM material spatial variability than *** performance of DCSE and WSCSE,which can be considered satisfactory in a deterministic framework,cannot guarantee an acceptable reliability level from a probabilistic *** highlights the importance and necessity of employing reliability analyses for the design of ***,consideration of only μ and CoV of qu seems to be sufficient for reliability analysis of WSCSE while for DCSE,uncertainties regarding the Ru(*** μ and CoV)and θv of qu cannot be ignored.

关键词： Reliability analysis Column-supported embankment(CSE) Stiffened deep cement mixing column Serviceability Adaptive kriging Monte Carlo simulation

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