Slope stability simulating system for frozen earth tunnel portal and use method of system

Abstract

The invention discloses a slope stability simulating system for a frozen earth tunnel portal and a use method of the system. The system includes a model system, a slope temperature adjusting system, ameasurement system and a data processing device, wherein the model system includes a model box and a tunnel model disposed in the box; the slope temperature adjusting system is arranged on a tunnel portal slope; the measurement system includes a temperature detecting device and a displacement detecting device; and the data processing device is connected with the measurement system. According to the invention, the model system simulates the frozen earth tunnel portal slope and a tunnel, the slope temperature adjusting system performs temperature adjustment on frozen earth samples in the modelbox, so that the heat stability of the frozen earth samples is improved; the measurement system monitors the frozen earth sample temperature and the displacement change of the tunnel portal and the data processing device stores and analyzes data fed back by the measurement system, so that reference and suggestions are provided for slope stability of the frozen earth tunnel portal and accidents oflandslide, collapse and the like of the frozen earth tunnel portal slope can be avoided effectively.

Description

technical field [0001] The invention relates to the field of tunnel entrance slope engineering, in particular to a tunnel entrance slope stability simulation system in frozen soil and a using method. Background technique [0002] Frozen soil refers to various rocks and soils below zero degrees Celsius and contains ice. Its area accounts for about one-fifth of my country's land area. It is imperative to build highways, high-speed railways and urban subway tunnels in the region. [0003] Permafrost is a soil medium that is extremely sensitive to temperature. It has rheological properties, and its long-term strength is much lower than its instantaneous strength. Due to these characteristics of permafrost, building tunnels in permafrost regions must face frost heaving and thawing. Dangerous, for example, in winter, the permafrost freezes like ice and expands as the temperature drops, causing the slope of the tunnel entrance to bulge; in summer, the permafrost thaws and shrinks, ...

AI Technical Summary

Problems solved by technology

[0004] With the influence of time and temperature, periodic freeze-thaw cycles occur in the slope rock mass at the entrance of permafrost tunnels, which will have a greater impact on the physical and mechanical properties of the rock mass. The strength of the rock mass is reduced, resulting in freeze-thaw damage. Therefore, this cycle of freeze-thaw occurs alternately, which is very unfavorable to the stability of the slope at the tunnel entrance, and is likely to cause instability such as mud flow, landslides and collapses.

[0005] Existing researchers have done a lot of research on the stability of tunnel entrance slopes, but there are few studies on the stability of tunnel entrance slopes affected by freeze-thaw cycles in permafrost regions.

For the stability of tunnel entrance slopes in frozen soil, the periodic cycle of freezing and thawing has a great impact on slope stability, which is likely to bring a lot of property losses and personal safety problems, and most of the existing research is on the freezing and thawing of frozen soil Therefore, it is necessary to carry out relevant simulation tests on the stability of tunnel entrance slopes in permafrost.

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