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Indian Lean construction Conference, ILCC 2022

作者： Babanagar, Nandeesh Sridharan Srinivasan, N. Rakshith, N. Department of Civil Engineering Indian Institute of Technology Madras Chennai India Heavy Civil Infrastructure Larsen and Toubro Construction Bangalore India

ISBN: (纸本)9789819954544

construction processes are difficult to plan and control due to the numerous uncertainties and complex resource interactions;therefore ‘launch and hope’ approach is often adopted, leading to significant waste in the process. Discrete event simulation (DES) helps model the behavior of production systems to understand the combined effects of all factors influencing the process, which can lead to significant savings. Executing concrete pours for infrastructure projects in overly populated old urban areas is a very complex exercise owing to the challenges of congested roads, hours of restricted traffic movement, greater transit distances, resource constraints, uncertainties in operating conditions and stringent quality control norms. Logistics planning with optimized resource allocation is further complicated when the resources such as batching plants, transit mixers and boom placers are shared between multiple project sites managed by different stakeholders simultaneously. The case study describes the application of DES for designing the process to yield smooth flow and optimal resource allocation. The lean construction concepts such as pull planning, establishing flow and takt time have been imbibed in the process for realizing the most optimum and resilient design. Emulating the ‘Last planner system’, several scenarios were studied with all stakeholders virtually with the aid of ExtendSIM software before the actual execution, which led to significant savings in time and cost. Further, following the principle of Gemba and Kaizen, the field data was captured with the aid of several digital tools and analyzed. Several brainstorming sessions with critical stakeholders lead to continuous improvement and further savings in time and cost. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Discrete event simulation

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Numerical modeling on strain energy evolution in rock system interaction with energy-absorbing prop and rock bolt

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International Journal of Mining Science and technology 2023年第10期33卷 1273-1288页

作者： Yang Hao Chunhui Liu Yu Wu Hai Pu Yanlong Chen Lingling Shen Guichen Li State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China School of Mines China University of Mining and TechnologyXuzhou 221116China

The interaction mechanism between coal and rock masses with supporting materials is significant in roadway control, especially in deep underground mining situations where dynamic hazards frequently happened due to high geo-stress and strong disturbed effects. This paper is to investigate the strain energy evolution in the interaction between coal and rock masses with self-designed energy-absorbing props and rock bolts by numerical modeling with the finite difference method. The interaction between rock and rock bolt/prop is accomplished by the cables element and the interface between the inner and outer props. Roadway excavation and coal extraction conditions in deep mining are numerically employed to investigate deformation, plastic zone ranges, strain energy input, accumulation, dissipation,and release. The effect on strain energy input, accumulation, dissipation, and release with rock deformation, and the plastic zone is addressed. A ratio of strain energy accumulation, dissipation, and release with energy input a, β, γ is to assess the dynamic hazards. The effects on roadway excavation and coal extraction steps of a, β, γ are discussed. The results show that:(1) In deep high geo-stress roadways, the energyabsorbing support system plays a dual role in resisting deformation and reducing the scope of plastic zones in surrounding rock, as well as absorbing energy release in the surrounding rock, especially in the coal extraction state to mitigate disturbed effects.(2) The strain energy input, accumulation is dependent on roadway deformation, the strain energy dissipation is relied on plastic zone area and disturbed effects, and strain energy release density is the difference among the three. The function of energyabsorbing rock bolts and props play a key role to mitigate strain energy release density and amount, especially in coal extraction condition, with a peak density value from 4×10^(4) to 1×10^(4)J/m^(3), and amount value from 3.57×10^(8) to 1.90×10^(6)J.(3) W

关键词： Strain energy Coal and rock mass Energy-absorbing prop and rock bolt Strain energy evolution

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Effects of multi-scale hybrid fibre reinforcement on the mechanical properties of ultra-high-performance concrete

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Magazine of Concrete Research 2025年第7-8期77卷 409-419页

作者： Niu, Xujing Liu, Hongbing Wu, Jiayi Guo, Chenyi Xu, Yongjiu Peng, Gaifei Nie, Ying School of Mechanics and Civil Engineering China University of Mining and Technology – Beijing Beijing China China Academy of Building Research Beijing China Faculty of Civil Engineering Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment Beijing Jiaotong University Beijing China Beijing Uni-Construction Group Co. Ltd Beijing China

An experimental investigation was conducted on the effects of multi-scale hybrid fibre reinforcement incorporating steel fibre and wollastonite fibre on the mechanical properties (compressive strength, tensile splitting strength, flexural toughness, and direct tensile properties) of ultra-high-performance concrete (UHPC). The results indicate that, compared with macrofiber reinforcement, the use of hybrid steel fibres (HSFs) (macrofibers and mesofibers) significantly improved the strength and toughness of the UHPC. In addition, the higher the dosage of mesofiber, the better the effect of the HSFs. Longer mesofibers were found to provide better performance in terms of interfacial bonding strength between the fibres and the UHPC matrix, leading to an increase in the anti-cracking effect of the HSFs, and hence improvement in the tensile splitting strength and flexural toughness of the UHPC. Moreover, adding wollastonite fibre as microfiber in addition to HSFs enhanced the mechanical properties of the UHPC. This may be related to the respective anti-cracking effect of three types of fibre and their synergistic snubbing effect, as well as the filling effect of wollastonite fibre and the chemical bonding effect caused by the reaction between wollastonite fibre and calcium hydroxide in the paste. © 2025 ICE Publishing. All rights reserved.

关键词： Steel fibers

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Research on Fatigue Residual Bearing Capacity of Prestressed Concrete Beams Considering Size Effect

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ce/papers 2025年第2期8卷 262-268页

作者： Zhou, Hongyu Han, Shuai Liu, Yanan Wang, Haoda Faculty of Architecture Civil and Transportation Engineering Beijing University of Technology Beijing100124 China Yatai Construction Science & Technology Consulting Institute Co. Ltd Beijing Beijing102209 China

In order to study the interaction mechanism of fatigue damage and size effect of prestressed concrete beams under fatigue load, multi-stage variable amplitude fatigue tests of three groups of prestressed concrete beams with different sizes were carried out. Through the research and analysis of the test data of prestressed concrete beams under fatigue load, it is found that due to the action of fatigue cyclic load, there is a size effect in the residual bearing capacity of prestressed concrete beams, that is, the increase of residual bearing capacity of prestressed concrete beams decreases with the increase of section size. Considering the influence of size and the degree of fatigue damage, the coefficient of the original formula is modified, and the new calculation formula of residual bearing capacity is basically consistent with the change of the measured results of the specimen. © 2025 Ernst & Sohn GmbH.

关键词： Concrete beams and girders

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Experimental study of vertical and batter pile groups in saturated sand using a centrifuge shaking table

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Earthquake engineering and engineering Vibration 2022年第1期21卷 23-36页

作者： Zhang Jian Li Yurun Yan Zhixiao Huang Da Rong Xian Liang Yan School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China Campus Construction and Management Hebei University of TechnologyTianjin 300401China

To study the dynamic response of vertical and batter pile groups in saturated sand,dynamic tests of these pile groups in saturated sand were carried out using the ZJU400 geotechnical centrifuge at Zhejiang *** following results were obtained.(1)As the motion intensity increased,the peak acceleration in soil layers at different depths significantly decreased,indicating that the soil stiffness was significantly reduced.(2)During the motion process,the instantaneous bending moment of the vertical and batter pile groups at different depths changed continuously,which had a strong relationship with the saturated sand *** the process of sand liquefaction,the residual bending moment generated by the batter pile was more obvious than that of the vertical pile.(3)With the liquefaction of the saturated sand,the distribution of the maximum bending moment of the vertical pile group changed,and the bending moment near the pile cap of the vertical and batter pile groups was always large.(4)In certain cases,the horizontal acceleration and dynamic displacement of the vertical pile cap were *** the motion intensity was large,residual displacement of the batter pile cap occurred.

关键词： centrifuge shaking table vertical and batter pile group saturated sand liquefaction dynamic response

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Dynamic p-y curves for vertical and batter pile groups in liquefied sand

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Earthquake engineering and engineering Vibration 2022年第3期21卷 605-616页

作者： Zhang Jian Li Yurun Rong Xian Liang Yan School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China Campus Construction and Management Hebei University of TechnologyTianjin 300401China

In this study,centrifuge model tests of vertical and batter pile groups in liquefied sand were conducted on a centrifuge shaking *** dynamic p-y curves for these pile groups before and during sand liquefaction were obtained from calculations based on test *** results confirm that liquefaction contributes to a reduction in the energy consumption of pile foundations,with the degradation effect being more pronounced for batter pile *** shallow depths,the difference in the backbone gradients of the p-y curves after liquefaction for vertical and batter pile groups indicates that the lateral stiffness of a batter pile group is greater than that of a vertical pile *** shaking intensity increases,the lateral stiffness of a vertical pile group increases with depth during the late stage of sand ***,the lateral stiffness of a batter pile group during liquefaction does not vary with *** results of this study provide a reference for the seismic design of vertical and batter pile groups in liquefied soil.

关键词： soil liquefaction pile-soil interaction p-y curve centrifuge shaking table

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Key issues in water sealing performance of underground oil storage caverns: Advances and perspectives

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Journal of Rock Mechanics and Geotechnical engineering 2023年第10期15卷 2787-2802页

作者： Yutao Li Bin Zhang Lei Wang Yiguo Xue Hanxun Wang Lei Shi Zhenhua Peng Junyan Li School of Engineering and Technology China University of Geosciences(Beijing)Beijing100083China Department of Civil and Architectural Engineering and Construction Management University of CincinnatiCincinnatiOH45221USA CNOOC Petrochemical Engineering Co. Ltd.Qingdao266061China

Water sealing performance is important for underground water-sealed oil storage(UWSOS).The key issues concerning water sealing performance mainly include the permeability of fractured rock mass(FRM),water-sealed safety(WSS),water curtain performance,and prediction and control of water *** paper reviews the progress of above four key issues on water sealing ***,the permeability of an FRM is the basis of water sealing performance,and several commonly used permeability test methods and spatial variation characteristics of permeability are ***,the current water sealing criteria are compared,and the evaluation methods of WSS are ***,the design parameters and efficiency evaluation of water curtain systems(WCSs)are *** water inflow of oil storage caverns(OSCs)can reflect the water sealing effect,and the prediction methods and control measures of water inflow are also ***,the advantages and disadvantages of the current research are discussed,and the potential research directions are pointed out,such as optimization of water sealing criteria and FRM model,quantitative evaluation of WCS efficiency,accurate prediction of water inflow,and improvement of grouting technology.

关键词： Underground water-sealed oil storage (UWSOS) Water-sealed safety(WSS) Water curtain system(WCS) Water inflow Fractured rock mass permeability

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Migration and fate of polycyclic aromatic hydrocarbons in bioretention systems with different media:experiments and simulations

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Frontiers of Environmental Science & engineering 2024年第4期18卷 17-33页

作者： Zhaoxin Zhang Jiake Li Zhe Liu Yajiao Li Bei Zhang Chunbo Jiang Institute of Land Engineering and Technology Shaanxi Provincial Land Engineering Construction Group Co.Ltd.Xi’an 710075China State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China Xi’an University of TechnologyXi’an 710048China School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China College of Landscape Architecture and Art Northwest A&F UniversityYangling 712100China

Polycyclic aromatic hydrocarbons(PAHs)present significant risks to human health owing to their carcinogenic,teratogenic,and mutagenic *** contamination of surface water with PAHs via runoff has become a prominent source of water *** the capacity of bioretention systems to remove PAHs from runoff is recognized,the dynamics of PAH migration and degradation in these systems are not *** study aims to explain the migration and fate of PAHs in bioretention systems through a series of experiments and model *** study constructed bioretention systems with three different media types and found that these systems achieved PAH load reductions exceeding 92%.Notably,naphthalene(NAP),fluoranthene(FLT),and pyrene(PYR)tended to accumulate in the media’s upper layer,at depths of 10 to 40 *** further analyze the migration and fate of PAHs during multi-site rainfall events and across prolonged operation,we applied the HYDRUS-1D model under three distinct *** findings of this study indicated that NAP degraded in 40 d,whereas FLT and PYR showed incomplete degradation after 120 *** continuous rainfall events,there was no clear pattern of PAH accumulation;however,FLT and PYR persisted in the bioretention *** combination of experimental and simulation findings highlights the inevitable accumulation of PAHs during extended use of bioretention *** research provides a theoretical basis for improving operational efficiency,advancing PAH degradation in bioretention systems,and reducing their toxicity.

关键词： Bioretention Polycyclic aromatic hydrocarbons HYDRUS-1D Model simulation Migration

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Role of Urban Underground-Space Development in Achieving Carbon Neutrality:A National-Level Analysis in China

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engineering 2025年第2期45卷 212-221页

作者： Jiajia Wang Huabo Duan Kunyang Chen Isabelle Y.S.Chan Fan Xue Ning Zhang Xiangsheng Chen Jian Zuo Department of Real Estate and Construction Faculty of ArchitectureThe University of Hong KongHong Kong 999077China School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430000China State Key Laboratory of Intelligent Geotechnics and Tunnelling College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518000China Leibniz Institute of Ecological Urban and Regional Development Dresden 01217Germany School of Architecture and Civil Engineering The University of AdelaideAdelaideSA 5005Australia

Surface space constraints and the associated massive carbon emissions present significant challenges to the sustainable development of *** underground space(UUS)construction is expected to provide a practical approach for alleviating the space constraints of surface ***,indepth examinations of the overall UUS system to reveal carbon emissions in the complex matrix are *** study demonstrates the vital role of UUS development in achieving carbon neutrality using a streamlined life-cycle assessment *** emissions and the mitigation potential of building underground spaces,metro systems,and geothermal energy sources are *** construction of underground spaces in buildings is the largest carbon emitter within the entire UUS system,releasing a considerable 547.2 Mt in ***,geothermal carbon sequestration,a significant element of the UUS system,provided an unexpected and impressive contribution,sequestering 170 Mt of carbon in *** study shows that UUS addresses the lack of space for urban development and is a lowcarbon method of urban ***,developing low-carbon building technologies and improving the UUS development model is imperative to achieving better low-carbon *** helps to promote more coordinated and sustainable urban development.

关键词： Urban underground space Carbon emissions Urban development construction sector

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Numerical analysis of seismic response of rectangular underground structure in coral sand

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Underground Space 2023年第2期9卷 155-172页

作者： Qi Wu Xuanming Ding Yanling Zhang Yanli Zhang Institute for Smart City of Chongqing University in Liyang Chongqing UniversityLiyang 213300China School of Resources and Safety Engineering Chongqing UniversityChongqing 400044China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China School of Civil Engineering Chongqing UniversityChongqing 400045China College of Civil Engineering Taiyuan University of TechnologyTaiyuan 030024China Technology R&D Center Shandong Construction Exploration Group Co.Ltd.Jinan 250031China

The underground structure in coral sand is threatened by *** special dynamic characteristics of coral sand were realized by finite difference ***,the stress–strain loops,shear modulus attenuation and hysteresis behaviour of coral sand were simulated using hysteresis *** this basis,numerical models were established to study the seismic response of the rectangular underground structure in coral sand,and the fluid–solid coupling and soil-structure interaction were *** results illustrate that the increasing relative density of coral sand foundation reduces the excess pore water pressure(EPWP),but amplifies the horizontal dynamic soil pressure of the coral sand-underground structure *** increase in the permeability coefficient of coral sand reduces the EPWP accumulation,which leads to an increase of the stiffness and a decrease of the acceleration amplification of coral sand sites.

关键词： Numerical simulation Coral sand Seismic response Underground structure Liquefaction

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