Buckling analysis of an innovative type of steel-concrete composite support in tunnels

Wang, Zhichao; Du, Ke; Xie, Yingchao; Su, Xulin; Shi, Yufeng; Xing, Li; Liu, Tong

doi:10.1016/j.jcsr.2020.106503

Cited by 28 publications

(5 citation statements)

References 47 publications

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“…With the decrease of porosity and the discharge of pore water, the compression modulus of soil is also increasing. It can be seen that with the increase of compactness, the elastic modulus E is also increasing, along with the density, stiffness, spring coefficient and damping coefficient of soil [50][51][52]. Therefore, the displacement of the hammer decreases.…”

Section: Dynamic Impact Analysismentioning

confidence: 97%

A measuring method for layered compactness of loess subgrade based on hydraulic compaction

Zhang¹,

Zhou²,

Guo³

et al. 2021

Meas. Sci. Technol.

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Subgrade compactness is a key factor determining subgrade quality. However, defects exist in the traditional methods for subgrade compactness measurement. Based on the theoretical analysis of dynamic impact and vibration waves, the hydraulic compaction method was used to measure the layered compactness of loess subgrade in this paper. A full-scale test was then carried out to observe the variation of soil parameters after hydraulic compaction. The results show that the layered interface settlement (LIS) of subgrade has the characteristic of stage change bounded by 0.9 m of depth and 6–9 blow times respectively. The compaction effect is not obvious when the depth exceeds 1.2 m, and thus the improvement depth was introduced. The settlement curve has the characteristic of the Boltzmann function. The relationship between layered compacted compactness and LIS was obtained by the regression method. Finally, based on the theory of layered compaction, a measuring method for the layered compactness of loess subgrade based on hydraulic compaction was presented. The field application demonstrates that the results of the hydraulic compaction method correspond well with that of the sand-filling method.

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Section: Dynamic Impact Analysismentioning

confidence: 97%

A measuring method for layered compactness of loess subgrade based on hydraulic compaction

Zhang¹,

Zhou²,

Guo³

et al. 2021

Meas. Sci. Technol.

Self Cite

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“…There were typical material nonlinear characteristics, and considering the nonlinearity of the material could make the finite element simulation more accurate [32]. The steel used the biso intrinsic model [33,34], and the model equation was…”

Section: Finite Element Modeling 221 Sections and Materials Propertiesmentioning

confidence: 99%

Deformation Analysis and Optimization of Steel-Tube-Columns Combined-with-Bailey-Beams Doorway Support

Wang,

Yang,

Guo

et al. 2023

Buildings

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As a commonly used support system in highway bridge construction, the deformation of steel-tube-columns-combined-with-Bailey-beams doorway supports is often an indicator for safety and quality control. In this paper, through finite element simulation and theoretical derivation, the main form of deformation of each part of the combined doorway is analyzed, by using the rigid body function of ANSYS. The study shows that when bearing vertical load, the deformation of the combined doorway is mainly caused by the deflection of the Bailey beams; when bearing transverse horizontal load, the deformation of the combined doorway is mainly caused by the rotation of the foundation; when bearing longitudinal horizontal load, the deformation of the combined doorway is mainly caused by the offset bending of the Bailey beams out of the plane. When several loads are applied to the combined doorway at the same time, the deformation in the linear phase follows the superposition principle, and the geometric nonlinearity has little effect on the overall deformation of the structure. The structural deformation caused by different types of loads can be calculated separately, and then the structural deformation under composite load can be calculated by linear superposition, using geometric relationships. The safety and deformation resistance of steel-tube-columns-combined-with-Bailey-beams doorway supports can be effectively improved by choosing reinforced Bailey beams, increasing the width of the foundation, and setting lateral supports between the Bailey beams.

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“…The surrounding rock pressure can be released through energy-consuming devices or other measures, allowing large deformation of the surrounding rock and supporting structure, and can provide sufficient supporting resistance to prevent lining cracking, twisting or even breaking of steel arches. In order to realize the effective support of soft rock tunnels, many scholars have also proposed a series of support theories and technical support systems, such as resistance-limiting and energy-dissipating support [22][23][24], prefabricated arc plate of reinforced concrete [25], stone masonry secondary support [26], concrete-filled steel tubular bolt-shotcrete support [27,28], a π-type steel-concrete composite structure [29], steel grid-concrete core tube [30], semi-rigid wire-shell bolting shotcrete [31,32] and other support forms.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Engineering Application of the Spatial Reticulated Grid Bolt-Shotcrete Support Structure for Excavation Tunnels

et al. 2022

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In view of the problems of rapid construction and deformation control of large cross-section tunnels in complex urban environments, the concept of “timely high-strength support” was put forward to form strong support over time and bear the load of surrounding rock in real time, and innovatively developed the spatial reticulated grid bolt-shotcrete support structure (SRGB). The research in this paper focuses on the supporting principle, bearing mechanical properties, snatch simulation test, construction process, and engineering application effects. The components of the SRGB and their respective functions were expounded in detail. The failure modes and deformation characteristics of the tested components were revealed through the indoor loading test, and the performance characteristics of the spatial reticulated grid concrete components with high strength and high rigidity were displayed. With the help of the multi-functional operation trolley, the assembly process test of the spatial reticulated grid was carried out, which verified the feasibility of mechanized construction and the rationality of structural design. Relying on the underground tunnel project of Guangzhou Metro, the spatial reticulated grid structure was successfully used as the initial support of the tunnel for the first time, forming a complete set of mechanized rapid construction technology for a large cross-section tunnel, and constructing a timely high-strength support system suitable for the complex urban environment. The research results provide a new idea and new technology for the mechanized rapid construction and efficient support of large cross-section tunnels.

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Buckling analysis of an innovative type of steel-concrete composite support in tunnels

Cited by 28 publications

References 47 publications

A measuring method for layered compactness of loess subgrade based on hydraulic compaction

A measuring method for layered compactness of loess subgrade based on hydraulic compaction

Deformation Analysis and Optimization of Steel-Tube-Columns Combined-with-Bailey-Beams Doorway Support

Experimental Study and Engineering Application of the Spatial Reticulated Grid Bolt-Shotcrete Support Structure for Excavation Tunnels

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