Helin Fu

Central South University

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Huang-Shi Deng

Central South University

Zhen Huang

Guangxi University

Jianbing Lv

Jinzhou Medical University

Zhanrong Li

Henan Provincial Eye Hospital

Yue Shi

Soochow University

Dongjiang Pan

Xuzhou University of Technology

Zikun Li

China National Building Materials Group (China)

Kairong Hong

China Railway Group (China)

Yue Shi

Academy of Military Medical Sciences

Hai-Dong Yi

Central South University

Cooperative Institutions

Central South University

Guangdong University of Technology

Guangxi University

Central South University of Forestry and Technology

Chinese Academy of Sciences

University of Chinese Academy of Sciences

China University of Mining and Technology

China Railway Group (China)

Changsha University of Science and Technology

Sun Yat-sen University

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Analysis of Foundation Pit Excavation Deformation and Parameter Influence of Pile-Anchor-Ribbed-Beam Support System

Applied Sciences (2023)

Quan Yin Helin Fu

The support system is the most important part of foundation pit engineering, which mainly determines the safety of foundation pit engineering. Based on the characteristics of the foundation pit of Changsha international financial center, the original pile-anchor-beam (PAB) support system is improved into a new form of support system, the pile-anchor-ribbed-beam (PARB) support system. This study establishes a numerical simulation model to calculate the surface settlement and the deformation of the retaining structure caused by the excavation of the foundation pit by using the PAB and PARB support systems, respectively. Finally, this study analyzes the influence of pile anchorage depth, ribbed beam size and waist beam size on the support effect. The field monitoring data are in good agreement with the numerical simulation results, which verifies the validity and accuracy of the numerical calculation model. The support effect of the new PARB support system is 30% higher than that of the original PAB support system. The position of maximum surface settlement is about 0.5 times the excavation depth from the retaining structure, and the position of maximum lateral deformation of the pile is about 0.9 times the excavation depth from the pile top. The increase in pile embedded depth and ribbed beam size can significantly improve the support effect, while the change of waist beam size does not improve the support effect significantly.

Foundation (evidence)

Settlement (finance)

Position (finance)

Sheet pile

10.3390/app13042379

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Citations (7)

Dynamic Responses of Bridge–Tunnel Overlapping Structure for High-Speed Railway Under Different Seismic Excitations

Geotechnical and Geological Engineering (2018)

Guangchen Sun Jiayou Xie Shan He Helin Fu Xueliang Jiang

Abutment

Earthquake shaking table

Bridge (graph theory)

10.1007/s10706-018-0588-6

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Citations (3)

Influence characteristics and mechanism of fragmental size of broken coal mass on the injection regularity of silica sol grouting

Construction and Building Materials (2020)

Dongjiang Pan Kairong Hong Helin Fu Jianjun Zhou Nong Zhang

Filtration (mathematics)

Deposition

10.1016/j.conbuildmat.2020.121251

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Citations (28)

Prediction of Brickwork Failure Using Discrete-Element Method

Journal of Materials in Civil Engineering (2018)

Wei Chen Heinz Konietzky Chao Liu Helin Fu Jiabing Zhang

In this study, a discrete element approach is used to simulate brickwork. Bricks are represented by blocks with Mohr-Coulomb plasticity and strain softening. The mortar consists of elastic Voronoi blocks connected by elastoplastic contacts. First, the parameters for brick and mortar are calibrated through a series of bending and compression tests conducted on brick and mortar samples, respectively. Then, shear tests on triplets are performed and Brazilian tests on disc samples are investigated by the numerical approach. Compared with results from other researchers, the numerical model can not only reproduce accurate strength values of the samples but is also able to display the damage development and fracture patterns of the brick as well as mortar.

Brickwork

Brick

Cuboid

10.1061/(asce)mt.1943-5533.0002431

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Citations (9)

Influence of shield tunnel construction on ground surface settlement under the condition of upper-soft and lower-hard composite strata

Journal of Vibroengineering (2020)

Jianbing Lv Xulong Li Helin Fu Yong Tang Zhanrong Li

Taking the shield tunnel project of Guangzhou Metro Line 8 from Tongdewei Station to Shangbu Station as the research background, using the research method of finite element simulation and site monitoring, this paper analyses the influence rules of shield tunneling on ground subsidence under the condition of different hard rock height ratios. The research results show that in the process of crossing different hard rock height ratio composite stratum, as the hard rock height ratio decreases, the value of ground settlement decreases and settlement tank becomes shallow. The surface subsidence in different hard rock height ratio strata is obviously different, and the maximum difference is about 8.6 mm; The influence of the hard rock height ratio on the surface longitudinal settlement is mainly reflected in the position change of the beginning and the end of the settlement. With the increase of the hard rock height ratio, the shield construction reduces the amount of the surface longitudinal settlement and its influence range; Through the research, it is found that the hard rock height ratio in the 0-0.2 and 0.5-1 is the sensitive interval, and the settlement value in these two hard rock height ratio interval varies greatly. It is necessary to pay attention to the uneven settlement of the ground surface caused by shield construction in the sensitive hard rock height ratio interval. The research results of this paper can provide reference value for similar shield construction in upper soft and lower hard composite stratum.

Settlement (finance)

Stratum

Groundwater-related subsidence

10.21595/jve.2020.20967

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Citations (15)

Numerical Investigation on the Mechanical Properties of Vault Void Lining and Steel Plate Strengthening

Materials (2023)

Shuai Shao Yimin Wu Helin Fu Sheng Feng Jiawei Zhang

To study the mechanism of vault lining under different void heights and verify the strengthening effect of the attached steel plate, a CDP (concrete-damaged plasticity) model and the XFEM (extended finite element method) were used to construct the local numerical model of the vault void, and an experiment was carried out for verification. The strengthened structure of the steel plate was assembled with a combination of a two-component epoxy adhesive and chemical anchor bolts. Five lining models with various void thicknesses, together with their strengthened models, were evaluated. The results of the established numerical model were compared with the experimental results in terms of failure mode, vertical displacement, and load-deformation results. The results of the two numerical models were in good agreement with the experimental results, revealing the failure mechanism of the vault lining. The rigidity of the specimen after steel plate strengthening was significantly improved. When the void height was one-fourth of the secondary lining thickness, the lining cracks were reduced from 14 to 4, and the distribution width of the cracks was also reduced from 1.047 to 0.091 m after steel plate strengthening. The level of damage caused by cracking was significantly reduced, which proves the effectiveness of the surface-sticking method for steel plate strengthening.

Void (composites)

Numerical models

Rigidity (electromagnetism)

10.3390/ma16020789

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Citations (4)

Study on deterioration, cracking mechanism and treatment measures of plain concrete lining with cold joints in high-speed railroad tunnel

Case Studies in Construction Materials (2023)

Huang-Shi Deng Helin Fu Wei Chen Yibo Zhao Hai-Dong Yi

Cracks in lining will lead to derivative diseases even seriously threaten the safety of high-speed trains. Construction-induced defects and external environmental changes are the main causes of lining cracks. From a typical high-speed railroad tunnel with a large number of lining cracks in China, construction cold joints are the main cause of its lining cracks. Based on the current research, both microscopic model and macroscopic model of concrete with cold joints were established to verify the applicability of the macroscopic model to simulate concrete elements with cold joints. Besides, finite element models with single and multiple cold joints were constructed to analyze the bearing performance and cracking mechanism of lining with cold joints. Finally, measures were proposed for the lining cracks caused by the expansion of cold joints. The results showed that: Using macroscopic model to simulate concrete elements with cold joints is reasonable. The tension area with cold joints has the most obvious deterioration, which is consistent with the cracking characteristics of field lining. Therefore, it is necessary to detect the cold joint defects in tensile area and where the pouring intervals exceed the initial setting time. The cracking of lining with single cold joints can be divided into two patterns, the back-side tension misalignment model and the inner-side tension misalignment model. While the cracking model with multiple cold joints can be regarded as a combination of single cold joint cracking models. The stress distribution and performance deterioration of lining with multiple cold joints is more complicated than that of single cold joints, more researches can be carried out by the method of this study.

Tension (geology)

Expansion joint

Cold-Formed Steel

10.1016/j.cscm.2023.e01895

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Citations (10)

Numerical Simulation Analysis of Damage and Detachment of Lining Blocks with Cold Joints under Aerodynamic Fatigue Loads

Case Studies in Construction Materials (2024)

Huang-Shi Deng Helin Fu Yue Shi Gui-Qian Cao Yibo Zhao

10.1016/j.cscm.2024.e03667

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Citations (0)

Analysis of Construction of Shallow Underwater Tunnel Based on Transient Characteristics of Excavation Unloading

Helin Fu

In order to research the surrounding rock stability of shallow underwater tunnel at the action of dynamic unloading,according to numerical simulation and real-time monitoring data,three-benching tunnelling method of explosive excavation and combination excavation method of milling-dig and controlled blasting are chosen to analyze the influence of transient characteristics,dynamic effects and construction method on the dike by taking the Liuyanghe tunnel project in Changsha City for an example.The results show that combination excavation method of milling-dig and controlled blasting can control vertical disturbance of surrounding rock effectively and ensure safety and reliability of tunnel mining for unstable geologic river bed and dike,which has good practicability and popularization value in shallow underwater tunnel project.

Dike

Transient (computer programming)

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Dynamic numerical simulation of transition between bridge and tunnel

Qiye jishu kaifa (2011)

Helin Fu

Transition between bridge and tunnel is a normal type of connection.But its dynamic character is not clear.With Numerical method,and to different types of foundations,different rockmass,different client angles,the dynamic character transition between bridge and tunnel is simulated in this paper.The research results will provide some useful reference for design,construction and operation for this structure.

Bridge (graph theory)

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