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large-scale model test study on the water pressure resistance of construction joints of karst tunnel linings

Frontiers of Structural and Civil Engineering 2023年第8期17卷 1249-1263页

作者： Meng HUANG Mingli HUANG Ze YANG Yuan SONG Zhien ZHANG School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China Enterprise Key Laboratory Tianjin Municipal Engineering Design and Research InstituteTianjin 300392China School of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainan 232001China

model tests and numerical calculations were adopted based on the New Yuanliangshan tunnel project to investigate the water pressure resistance of lining construction joints in high-pressure and water-rich karst tunnels.A large-scale model test was designed and conducted,innovatively transforming the external water pressure of the lining construction joint into internal water *** effects of the embedded position and waterstop type on the water pressure resistance of the construction joint were analyzed,and the reliability of the model test was verified via numerical *** results show that using waterstops can significantly improve the water pressure resistance of lining construction *** water pressure resistance of the lining construction joint is positively correlated with the lining thickness and embedded depth of the *** addition,the type of waterstop significantly influences the water pressure resistance of lining construction *** test results show that the water pressure resistance of the embedded transverse reinforced waterstop is similar to that of the steel plate waterstop,and both have more advantages than the rubber *** water pressure resistance of the construction joint determined via numerical calculations is similar to the model test results,indicating that the model test results have high accuracy and *** study provides a reference for similar projects and has wide applications.

关键词： karst tunnel lining construction joint water pressure resistance large-scale model test numerical calculations

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large-scale model testing of high-pressure grouting reinforcement for bedding slope with rapid-setting polyurethane

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Journal of Mountain Science 2024年第9期21卷 3083-3093页

作者： ZHANG Zhichao TANG Xuefeng LIU Kan YE Longzhen HE Xiang Key Laboratory of Geohazard Prevention of Hilly Mountains Ministry of Natural Resources of ChinaFujian Geological Engineering Survey InstituteFuzhou 350002China Technology Innovation Center for Monitoring and Restoration Engineering of Ecological Fragile Zone in Southeast China Ministry of Natural ResourcesFuzhou 350001China School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore 639798Singapore

Bedding slope is a typical heterogeneous slope consisting of different soil/rock layers and is likely to slide along the weakest *** slope protection methods for bedding slopes,such as retaining walls,stabilizing piles,and anchors,are time-consuming and labor-and *** study proposes an innovative polymer grout method to improve the bearing capacity and reduce the displacement of bedding slopes.A series of large-scale model tests were carried out to verify the effectiveness of polymer grout in protecting bedding ***,load-displacement relationships and failure patterns were analyzed for different testing slopes with various dosages of *** show the great potential of polymer grout in improving bearing capacity,reducing settlement,and protecting slopes from being crushed under *** polymer-treated slopes remained structurally intact,while the untreated slope exhibited considerable damage when subjected to loads surpassing the bearing *** is also found that polymer-cemented soils concentrate around the injection pipe,forming a fan-shaped sheet-like *** study proves the improvement of polymer grouting for bedding slope treatment and will contribute to the development of a fast method to protect bedding slopes from landslides.

关键词： Polyurethane Bedding slope Grouting Slope protection large-scale model test

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Behavior of Pile Group with Elevated Cap Subjected to Cyclic Lateral Loads

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China Ocean Engineering 2015年第4期29卷 565-578页

作者：陈云敏顾明陈仁朋孔令刚张浙杭边学成 MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Department of Civil EngineeringZhejiang University Zhejiang Electric Power Design Institute

The pile group with elevated cap is widely used as foundation of offshore structures such as turbines, power transmission towers and bridge piers, and understanding its behavior under cyclic lateral loads induced by waves, tide water and winds, is of great importance to designing. A large-scale model test on 3×3 pile group with elevated cap subjected to cyclic lateral loads was performed in saturated silts. The preparation and implementation of the test is presented. Steel pipes with the outer diameter of 114 mm, thickness of 4.5 mm, and length of 6 m were employed as model piles. The pile group was cyclic loaded in a multi-stage sequence with the lateral displacement controlled. In addition, a single pile test was also conducted at the same site for comparison. The displacement of the pile cap, the internal forces of individual piles, and the horizontal stiffness of the pile group are presented and discussed in detail. The results indicate that the lateral cyclic loads have a greater impact on pile group than that on a single pile, and give rise to the significant plastic strain in the soil around piles. The lateral loads carried by each row of piles within the group would be redistributed with loading cycles. The lateral stiffness of the pile group decreases gradually with cycles and broadly presents three different degradation patterns in the test. Significant axial forces were measured out in some piles within the group, owing to the strong restraint provided by the cap, and finally lead to a large settlement of the pile group. These findings can be referred for foundation designing of offshore structures.

关键词： pile group large-scale model test cyclic lateral loads stiffness degradation settlement

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The role of polyurethane foam compressible layer in the mechanical behaviour of multi-layer yielding supports for deep soft rock tunnels

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第11期16卷 4554-4569页

作者： Haibo Wang Fuming Wang Chengchao Guo Lei Qin Jun Liu Tongming Qu School of Civil Engineering Sun Yat-sen UniversityGuangzhou510275China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519000China Guangdong Key Laboratory of Oceanic Civil Engineering Zhuhai519082China Guangdong Research Center for Underground Space Exploitation Technology Guangzhou510275China Southern Institute of Infrastructure testing and Rehabilitation Technology Huizhou516029China Department of Hydraulic Engineering School of Infrastructure EngineeringDalian University of TechnologyDalian116024China Department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyClearwater BayKowloonHong KongChina

The polyurethane foam(PU)compressible layer is a viable solution to the problem of damage to the secondary lining in squeezing ***,the mechanical behaviour of the multi-layer yielding supports has not been thoroughly *** fill this gap,large-scale model tests were conducted in this *** synergistic load-bearing mechanics were analyzed using the convergenceconfinement *** types of multi-layer yielding supports with different thicknesses(2.5 cm,3.75 cm and 5 cm)of PU compressible layers were investigated *** image correlation(DIC)analysis and acoustic emission(AE)techniques were used for detecting the deformation fields and damage evolution of the multi-layer yielding supports in *** indicated that the loaddisplacement relationship of the multi-layer yielding supports could be divided into the crack initiation,crack propagation,strain-hardening,and failure *** with those of the stiff support,the toughness,deformability and ultimate load of the yielding supports were increased by an average of 225%,61%and 32%,***,the PU compressible layer is positioned between two primary linings to allow the yielding support to have greater mechanical *** analysis of the synergistic bearing effect suggested that the thickness of PU compressible layer and its location significantly affect the mechanical properties of the yielding *** use of yielding supports with a compressible layer positioned between the primary and secondary linings is recommended to mitigate the effects of high geo-stress in squeezing tunnels.

关键词： Multi-layer yielding supports Polyurethane foam compressible layer Synergistic mechanism large-scale model test Deep soft rock tunnels

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Geometry and Maximum Width of a Stable Slope Considering the Arching Effect

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Journal of Earth Science 2020年第6期31卷 1087-1096页

作者： Kun Fang Huiming Tang Xuexue Su Wentao Shang Shenglong Jia Faculty of Engineering China University of GeosciencesWuhan 430074China School of Civil Engineering Shandong Jianzhu UniversityJinan 250101China Faculty of Engineering University of AlbertaEdmonton ABT6G2R3Canada

The stability of an arching slope in deformable materials above strong rocks strongly depends on the shape and width of the *** for a free surface problem that incorporate these two parameters were derived using a simplified two-dimensional arching slope model,and were validated using physical model tests under 1 g and centrifugal *** results are used to estimate the maximum excavation width for a weak claystone slope in a lignite mine,for which we calculate a safety factor of 1.31.

关键词： slope failure geological engineering cracked soil slope large-scale model test deformation mechanism arching slope

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Experimental and numerical study on structural performance of reinforced concrete box sewer with localized extreme defect

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Underground Space 2018年第2期3卷 166-179页

作者： Yuequan Bao Dongyang Feng Nan Ma Hehua Zhu Timon Rabczuk College of Ciuil Engineering Tongji UniversityShanghai 200092China Pipeline Management Branch Company Shanghai Municipal Sewerage Co.LtdShanghai 201103China Institute of Structural Mechanics Bauhaus University of WeimarWeimar 99423Germany

An experimental and numerical investigation into the structural performance of reinforced concrete box sewers with typical corrosion-related extreme defects localized at the ceiling was ***,during the large-scale laboratory test,some key struc-tural responses were captured and evaluated,including the crack width development process(via digital image correlation measurement),ceiling deﬂection,and material strains of both complete and typical defective *** failure modes and load-carrying mechanism throughout the specimen loading phases were ***,the specimen failure process was simulated using a damage-basedﬁnite element method,and a related parameter sensitivity analysis was *** results indicate that the defective ceiling cracked at mid-span under a low load value,but the bending capacity loss can be substituted by two shoulders and carry three toﬁve times more load before completely *** simulation matched the lab test qualitatively,and with the suggested set strategy of material parameters,the load-deﬂection feature curve could provide a practical prediction of the ultimate bearing capacity of the defec-tive sewers,with a 10–15%error on the safe side.

关键词： Defective reinforced concrete box sewer Corrosion Structural performance large-scale model test Digital image correlation measurement Failure simulation

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