Abstract
Geotechnical problems are complicated to the extent and cannot be expected in other areas since non-uniformities of existing discontinuous, pores in materials and various properties of the components. At present, it is extremely difficult to develop a program for tunnel analysis that considers all complicated factors. However, tunnel analysis has made remarkable growth for the past several years due to the development of numerical analysis method and computer development, given the situation that it was difficult to solve formula of elasticity, viscoelasticity, and plasticity for the dynamic feature of the ground when the constituent laws, yielding conditions of ground materials, geometrical shape and boundary conditions of the structure were simulated in the past. The stability of rock mass around an underground large cavern is the key to the construction of large-scale underground projects. In this paper, the stability analysis was carried out based on those parameters by using 2D FEM RS2 program. The calculated stress and displacements of surrounding rock and rock support by FEM analysis were compared with those allowable values. The pattern of deformation, stress state, and the distribution of plastic areas are analyzed. Finally, the whole stability of surrounding rock mass of underground caverns was evaluated by Rock Science - RS2 software. The calculated axial forces were far below design capacity of rock bolts. The strong rock mass strength and high horizontal to vertical stress ratio enhanced safe working conditions throughout the excavation period. Thus wide span caverns and the system of caverns could be stability excavated sedimentary rock during the underground cavern and the system of caverns excavation by blasting method. The new method provides a reliable way to analyze the stability of the caverns and the system of caverns and also will help to design or optimize the subsequent support. Doi: 10.28991/CEJ-2022-08-01-06 Full Text: PDF
Highlights
Cai Mep Project – Cai Mep LPG Cavern Project located in Ba Ria-Vung Tau province, Viet Nam
A numerical analysis using finite element software has been conducted to investigate the stability of rock mass surrounds the underground cavern and the system of caverns
Some interesting conclusions arising from numerical simulations are given: Based on the technical design with the temporary rock support of bolt pattern and shotcrete liner, the output conditions of the design model, the stability of surrounding rock of cavern and the system of caverns has been conducted by Rocscience - RS2
Summary
Cai Mep Project – Cai Mep LPG Cavern Project located in Ba Ria-Vung Tau province, Viet Nam. The tunnel is located Grade II bedrock and the maximum height of soil on the tunnel is 98.0m The purpose of this analysis is to review the feasibility of the above tunnel support types for cavern with the previous excavation done by civil works. The same crew for drilling, hauling, scaling team, and charging were used to excavate at several tunnel faces This helps in constructing the cavern in minimum time. The tunnels are located close to each other and in a system with the same elevation as shown, we carry out checking the stability of the rock support and the rock mass during tunnels excavation at the save time.
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