Numerical Analysis of Three-Layer Deep Tunnel Composite Structure

Yang

Mathematical Problems in Engineering

et al. 2022

In order to effectively control the ground deformation and ground subsidence during subway construction, three-dimensional numerical simulation of soil deformation during shield tunnel construction is proposed. Based on a subway tunnel project, this essay firstly divides the shield construction process into several stages and analyzes the vertical displacement of soil in each stage. FLAC 3D was used for three-dimensional finite difference numerical simulation. By comparing the numerical simulation results with the field measured data, the soil settlement caused by shield tunnel excavation is studied deeply. The simulation results show that the maximum settlement value of the monitoring data is 0.59 mm, and the maximum settlement value of the numerical simulation is 0.82 mm, with a difference of 0.23 mm. The maximum value of uplift on both sides of the tunnel is 0.41 mm in monitoring data and 0.29 in numerical simulation, with a difference of 0.12 mm. The maximum settlement value of monitoring data is 2.59 mm, and the maximum settlement value of numerical simulation is 3.05 mm, with a difference of 0.46 mm. The maximum value of uplift on both sides of the tunnel is 0.32 mm in monitoring data and 1.89 mm in numerical simulation, with a difference of 1.57 mm. The settlement value of numerical simulation is slightly larger than that of monitoring data. Conclusion. The simulation can well simulate the state of soil uplift on both sides, and the width of settlement groove is in good agreement with the monitoring data.

Section: Introduction To the Soil Constitutive Modelmentioning

confidence: 99%

Three-Dimensional Numerical Simulation of Soil Deformation during Shield Tunnel Construction

Yang

Mathematical Problems in Engineering

et al. 2022

“…Ramezani 18 modeled the foundation soil using torsional and translational springs, calculated the sway and slip modes of the retaining wall, and its result was consistent with those calculated by ANSYS. Sun 19 simulated pipe-soil interaction through COMBIN39 spring element, and its reliability was confirmed by the theoretical formula. Zhao 20 used the COMBIN39 spring element to simplify the interaction between the shaft and SRSM under non-mining action, and verified the effectiveness of the simplified method by comparing it with the ANSYS calculation results.…”

mentioning

confidence: 82%

Research of deformation law about guide rails under the action of mining deformation in mine vertical shaft

Zhao

Han

et al. 2023

Sci Rep

To lay a foundation for alleviating the influence of mining shaft deformation (MSD) on the guide rail (GR) and monitoring the shaft deformation state, this paper studies the deformation law and mechanism of the guide rail under the MSD. Firstly, a spring is used to simplify the interaction between the shaft lining and surrounding rock soil mass (SRSM) under MSD, and its stiffness coefficient is deduced by the elastic subgrade reaction method. Secondly, a simplified finite element model is established based on spring element, the stiffness coefficient is calculated by the derivation formula, and its effectiveness is verified. Finally, the deformation law and mechanism of GR are analyzed under different types and degrees of MSD, and the deformation characteristics are studied under the disconnection between the shaft, bunton and guide rail. The results show that the established finite element model can better simulate the interaction between the shaft lining and SRSM, and the calculation efficiency is greatly improved. The guide rail deformation (GRD) has a strong ability to characterize MSD and owns the distinctive feature corresponding to different types and degrees of MSD and the connection state. This research can provide reference and guidance for the shaft deformation monitoring and the maintenance and installation of the GR, and also lays a groundwork for studying operation characteristic of hoisting conveyance under MSD.

“…As a result of g 1 (z)≠0，g 2 (z)≠0, the contact form is not only affected by the HC position, but also by the deformation law of the GR, which leads to changes with the HC position and GR deformation law, as shown in Eq. ( 18) and (19).…”

Section: Contact Relationship Between Guide Roller and Railmentioning

confidence: 99%

Research on operation characteristics of hoisting conveyance under mining deformation action in mine vertical shaft

Zhao

Han

et al. 2023

Preprint

In order to improve the operating stability of the mine hoisting system and provide reference and guidance for monitoring the mining shaft deformation (MSD), the operating characteristics of the hoisting conveyance (OCHC) under MSD are studied. Firstly, a simplified finite element model based on spring element is established for analyzing the guide rail (GR) deformation law under MSD, and the deformation result calculated by ANSYS is transformed into the geometric model in the dynamics model. Secondly, the transversal-longitudinal coupling relationship of the guide roller (GRO) is analyzed, and it is deduced that the variation law of the contact relationship between the guide roller and rail (GROR) with its deformation and the HC position. On the basis of the above, the dynamics model of the mine hoisting system established by ADAMS is verified by experiment and used to analyze the operating characteristics (OC) under different types and degrees and connection states. The analysis results show that the deformation result transformation of GR can characterize the SD trend and the connection state between the bunton and shaft and GR under MSD and can realize the co-simulation of ANSYS and ADAMS, which makes the dynamic model can accurately reflect the OCHC under MSD. The displacement and vibration acceleration of HC in MSD direction, angular displacement (AD) around its vertical axis and buffer relative displacement (BRD) are highly sensitive to the deformation and contain prominent feature, which can realize the characterization of the deformation. The vibration acceleration of hoisting conveyance (VAHC) and the BRD in the deformation direction produce a prominent impact response to the disconnection between the bunton and guide rail (BGR). The disconnection of the bunton from shaft only changes the frequency and amplitude of the low-frequency oscillation of BRD near disconnection position. It can provide a basis for identifying MSD and mitigating its effect on HC.