Research on large deformation control technology of tunnels in squeezing rock and its application

Abstract

Field studies by squeezing rock deformation have shown that large deformation slips can occurs in tunnels in squeezing rock, the tunnels may be partially or completely broken. This article proposed two schemes for controlling the deformation of squeezing rock, which are “resistance combine release” Scheme 1 and “strong support” Scheme 2, the deformation characteristics and deformation mechanism of squeezing rock is researched by Zhongyi Tunnel. The results show that Scheme 2 is superior to Scheme 1 in terms of deformation rate, cumulative deformation, and monthly construction footage. Research results can provide a reference for similar projects.

A New Numerical Finite Strain Procedure for a Circular Tunnel Excavated in Strain-Softening Rock Masses and Its Engineering Application

“…During the construction of the Zhongyi tunnel in the Yunnan province of China, over 44% of the tunnel encountered large deformation and the maximum deformation was larger than 600 mm. The main reason for this problem was the mismatch between the support stiffness and the weak surrounding rock conditions [37,40]. This section adopts the finite strain procedure to calculate the needed stiffness of the whole supporting system.…”

Design of tunnel steel arch looping manipulator with multiple actuators in limited space

“…Dimension synthesis studies focus on the relationship between manipulator performance and structural dimensions. 7 Most of the manipulators currently used in industry and engineering adopt empirical methods for configuration synthesis. In addition, there have been many innovative configuration synthesis methods, such as Lie group, 8 – 10 screw theory, 11 – 14 position and orientation characteristic set theory, 15 , 16 General-Function set, 17 , 18 and so on.…”