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Consolidation of high replacement ratio stone column-reinforced ground:Analytical solutions incorporating clogging effect

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3311-3326页

作者： Jinxin Sun Mengmeng Lu Baolong Xu Jie Shan School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou221116China Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221006China

The utilization of stone columns has emerged as a popular ground improvement strategy,whereas the drainage performance can be adversely hampered by clogging *** the ample progress of calculation methods for the consolidation of stone column-improved ground,theoretical investigations into the clogging effect have not been thoroughly ***,it is imperative to involve the column consolidation deformation to mitigate computational error on the consolidation of composite ground with high replacement *** this context,an analytical model accounting for the initial clogging and coupled time and depth-dependent clogging of stone columns is ***,the resulting governing equations and analytical solutions are obtained under a new flow continuity relationship to incorporate column consolidation *** accuracy and reliability of the proposed model are illustrated by degradation analysis and case studies with good ***,the computed results of the current study are juxtaposed against the existing models,and an in-depth assessment of the impacts of several crucial parameters on the consolidation behavior is *** results reveal that ignoring column consolidation deformation leads to an overestimate of the consolidation rate,with maximum error reaching up to 16%as the replacement ratio ***,the initial clogging also has a significant influence on the consolidation ***,the increment of depth and time-clogging factors a and b will induce a noticeable retardation of the consolidation process,particularly in the later stage.

关键词： Consolidation Composite ground stone column Clogging effect Ground improvement Analytical model

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Shear wave velocity-based evaluation and design of stone column improved ground for liquefaction mitigation

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Earthquake Engineering and Engineering Vibration 2017年第2期16卷 247-261页

作者： Zhou Yanguo Sun Zhengbo Chen Jie Chen Yunmin Chen Renpeng MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Institute of Geotechnical Engineering Zhejiang University Hangzhou 310058 China

The evaluation and design of stone column improvement ground for liquefaction mitigation is a challenging issue for the state of practice. In this paper, a shear wave velocity-based approach is proposed based on the well-defined correlations of liquefaction resistance （CRR）-shear wave velocity （V）-void ratio （e） of sandy soils, and the values of parameters in this approach are recommended for preliminary design purpose when site specific values are not available. The detailed procedures of pre- and post-improvement liquefaction evaluations and stone column design are given. According to this approach, the required level of ground improvement will be met once the target V of soil is raised high enough （i.e., no less than the critical velocity） to resist the given earthquake loading according to the CRR-V relationship, and then this requirement is transferred to the control of target void ratio （i.e., the critical e） according to the V-e relationship. As this approach relies on the densification of the surrounding soil instead of the whole improved ground and is conservative by nature, specific considerations of the densification mechanism and effect are given, and the effects of drainage and reinforcement of stone columns are also discussed. A case study of a thermal power plant in Indonesia is introduced, where the effectiveness of stone column improved ground was evaluated by the proposed V-based method and compared with the SPT-based evaluation. This improved ground performed well and experienced no liquefaction during subsequent strong earthquakes.

关键词： Liquefaction mitigation stone column Shear wave velocity Void ratio Densification Ageing effect

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Analytical solutions for consolidation of stone column composite foundations considering time-dependent boundary and loading

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Rock Mechanics Bulletin 2023年第3期2卷 106-118页

作者： Xiangzong Lu Chuanxun Li Department of Civil Engineering Jiangsu UniversityZhenjiangJiangsu212013PR China

In response to the existing consolidation theory for stone column composite foundations which cannot consider the time-dependent loading and the well resistance effect of stone columns under time-dependent boundaries,a consolidation model that can reflect these characteristics is developed in this study,and the corresponding analytical solutions are obtained under permeable top surface with permeable bottom surface(PTPB)and permeable top surface with impermeable bottom surface(PTIB),*** addition,the reliability of the proposed solutions is verified by comparing them with existing analytical *** calculations are then performed by the proposed solutions to analyze the consolidation behaviors of stone column composite foundations under time-dependent boundaries,the results show that the interface parameters have a large effect on the distribution of excess pore water pressure(EPWP)along the depth;for projects with longer construction time,the permeability of the top and bottom surfaces of the composite foundation has a smaller effect on the average consolidation ***,the proposed solution is applied to the settlement calculation in an actual engineering project,and the theoretical results show a general agreement with the measured data by considering the influence of the interface parameters.

关键词： stone column Composite foundations Time-dependent loading Time-dependent boundaries Analytical solutions

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Centrifuge modeling of a large-scale surcharge on adjacent foundation

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3181-3191页

作者： Jinzhang Zhang Zhenwei Ye Dongming Zhang Hongwei Huang Shijie Han Tong Zou Le Zhang Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education and Department of Geotechnical Engineering Tongji UniversityShanghai200092China CCCC Third Harbor Consultants Co LtdShanghai200032China Qingdao Conson Jiaozhou Bay Second Subsea Tunnel Co. LtdQingdao266000China

This study investigates the ground and structural response of adjacent raft foundations induced by largescale surcharge by ore in soft soil areas through a 130g centrifuge modeling test with an innovative layered loading *** prototype of the test is a coastal iron ore yard with a natural foundation of deep soft ***,it is necessary to adopt some measures to reduce the influence of the large-scale surcharge on the adjacent raft foundation,such as installing stone columns for foundation *** an acceleration of 130 g,the model conducts similar simulations of iron ore,stone columns,and raft foundation *** tested soil mass has dimensions of 900 mm×700 mm×300 mm(lengthwidthdepth),which is remodeled from the soil extracted from the drilling *** test conditions are consistent with the actual engineering conditions and the effects of four-level loading conditions on the composite foundation of stone columns,unreinforced zone,and raft foundations are *** automatic layer-by-layer loading device was innovatively developed to simulate the loading process of actual engineering more *** composite foundation of stone columns had a large settlement after the loading,forming an obvious settlement trough and causing the surface of the unreinforced zone to *** 12 m surcharge loading causes a horizontal displacement of 13.19 cm and a vertical settlement of 1.37 m in the raft *** stone columns located on both sides of the unreinforced zone suffered significant shear damage at the sand-mud *** to the reinforcement effect of stone columns,the sand layer below the top of the stone columns moves ***,the horizontal earth pressure in the raft foundation zone increases *** stone columns will form new drainage channels and accelerate the dissipation of excess pore pressure.

关键词： Centrifuge modeling stone column Composite foundation Ground movement Raft foundation

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Experimental study on soil improvement with stone columns and granular blankets

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Journal of Central South University 2018年第4期25卷 866-878页

作者： Nima MEHRANNIA Farzin KALANTARY Navid GANJIAN Department of Civil Engineering Tehran Science and Research Branch Islamic Azad University Department of Civil Engineering K.N.Toosi University of Technology

stone column is one of the soil stabilizing methods that is used to increase bearing capacity and decrease the settlement of soft *** and unreinforced granular blankets are now being utilized to overcome the problems of soft *** this research,the bearing capacity of stone columns,granular blanket,and a combination of both methods in reinforced and unreinforced modes were studied using scaled physical *** show that using granular blanket,stone column,and combination of both improves bearing capacity of soft *** geogrid as the reinforcement of granular blankets and geotextile as stone-column encasement increases the efficiency of granular blankets and stone columns ***,in the case of using geotextile around the stone column,the stress concentration ratio of the stone column will increase as well as its rigidity and bearing capacity.

关键词： stone column bearing capacity geogrid geotextile granular blanket soil improvement

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Consolidation solution for composite foundation considering a time-and depth-dependent stress increment along with three distribution patterns of soil permeability

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第4期12卷 268-277页

作者： Meng-meng LU Kang-he XIE Chuan-xun LI Kun WANG State Key Laboratory for Geomechanics and Deep Underground Engineering School of Meehanics & Civil Engineering China University of Mining & Technology Xuzhou 221008 China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University Hangzhou 310058 China

In actual engineering practice,the stress increment within a composite foundation caused by external loads may vary simultaneously with depth and *** addition,column installation always leads to a decay of soil permeability towards the ***,almost none of the consolidation theories for composite foundation comprehensively consider these factors until *** this reason,a stress increment due to external loads changing simultaneously with time and depth was incorporated into the analysis,and three possible variation patterns of soil's horizontal permeability coefficient were considered to account for the detrimental influence of column *** three patterns included a constant distribution pattern(Pattern I),a linear distribution pattern(Pattern II),and a parabolic distribution pattern(Pattern III).Solutions were obtained for the average excess pore water pressures and the average degree of consolidation *** several special cases were discussed in detail based on the general solution ***,comparisons were made,and the results show that the present solution is the most general rigorous solution in the literature,and it can be broken down into a number of previous *** consolidation rate is accelerated with the increase in the value of the top to the bottom stress *** consolidation rate calculated by the solution for Pattern I is less than that for Pattern II,which in turn is less than that for Pattern III.

关键词： Consolidation Composite foundation stone column Permeability Ramp load Disturbance effect

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Improving Bearing Capacity of Weak Soils:A Review

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Journal of Construction Research 2021年第1期3卷 29-34页

作者： Samaila Saleh Department of Civil Engineering Hassan Usman Katsina PolytechnicKatsinaNigeria

Weak soils,such as soft clay and loose sand,have a poor bearing capacity,making them incapable of bearing the load of superstructures that will be imposed on *** a result,engineers must have a solution to the issue of poor bearing capacity in weak soils before embanking into building on *** paper reviewed the use of stone columns,piled rafts,and geogrids for improving the bearing capability of weak *** findings from recent research are also *** the review of the previous researcher’s findings,it was found that modelling approaches such as physical modelling(full scale,centrifuge,laboratory scale)and numerical modelling are used to study bearing capacity improvement.

关键词： Bearing capacity stone column Piled raft Geogrids physical modelling Numerical simulation

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