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Frost heave force model of rock tunnel based on rock-water-ice force in-situ test

A technology for in-situ testing and frost heave force, used in soil testing, measuring devices, instruments, etc.

Inactive Publication Date: 2019-12-20
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similar to the "Code for Geological Survey of Frozen Soil Engineering (GB 50324-2014)", the recommended in-situ test method of frost heave is mainly to use layered frost heave instrument and precision level test, these two methods are obviously not suitable for Cracked Rock Tunnel in Cold Region

Method used

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  • Frost heave force model of rock tunnel based on rock-water-ice force in-situ test
  • Frost heave force model of rock tunnel based on rock-water-ice force in-situ test
  • Frost heave force model of rock tunnel based on rock-water-ice force in-situ test

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Embodiment

[0078] Project Overview

[0079] Such as figure 1 Shown: National Highway 317 (North Line of Sichuan-Tibet Highway) Queershan Tunnel is currently the highest and longest highway tunnel in my country. The tunnel is located in Dege County, northern Ganzi Prefecture, Sichuan Province. The main peak of Queer Mountain is 6168m above sea level, the entrance elevation of Queer Mountain Tunnel is 4378.72m, the elevation of tunnel exit is 4239.50m, and the length of the tunnel is 7079m. As an important project of "four roads and one tunnel" in the Sichuan-Tibet Economic Corridor, the Queershan Tunnel has important political, economic and military significance.

[0080] The tunnel site area is a typical plateau and high-cold climate. The average temperature of the tunnel exit area over the years is -0.3°C, and the monthly average temperature is between -9.0°C and 8.6°C. The coldest month (March) has an average temperature of -9.0°C. The average temperature of the hot month is 8.6°C, a...

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Abstract

The present invention discloses a frost heave force model of a rock tunnel based on a rock-water-ice force in-situ test. A pore water pressure gauge, an earth pressure box, and a multi-point platinumresistance temperature sensor are used in a combination manner to perform a frost heave force in-situ test on fractured rocks, the temporal and spatial evolution laws of the fissure water pressure, the ice pressure, and the surrounding rock pressure before and after freezing of the fractured rocks are obtained, and theoretical model calculation results, in-situ test results, and existing researchresults are compared and analyzed. According to the frost heave force model of the rock tunnel based on the rock-water-ice force in-situ test provided by the present invention, in-situ testing on siteis used, the test method is innovated outside the previous test system mainly containing the freeze-thaw cycle mechanics test of fractured rock masses, the lack of measurement methods is compensated,the frost heave force in natural water-containing cracks is obtained, and starting from macro and engineering applications, the discussion of the meso-structure and fracture geometry of fractured rocks is avoided; the general area of low-temperature water-ice phase transition and the direction of water migration are considered; and the frost heave force model of the rock tunnel based on the rock-water-ice force in-situ test provided by the present invention will provide a reference for similar projects of the currently developed Sichuan-Tibet Highway.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a rock tunnel frost-heave force model based on rock-water-ice force in-situ testing. Background technique [0002] At present, the frost heave theory of rock tunnel mainly includes the theory of water-bearing regolith frost heave, the theory of local water storage frost heave and the theory of crack frost heave. As a key issue in the frost heave theory of fractured rock mass, MATSUOKA N et al. believe that for saturated low-permeability rock mass, a huge frost heave force will be generated in the crack, and the frost heave force is the main driver of the crack frost heave expansion of rock mass in cold regions The force determines the degree of freeze-thaw damage of the rock mass. [0003] In the engineering practice of tunnels in cold regions, Xia Caichu and other scholars also found that the frost heaving of rock mass with frozen cracks is actually a comprehensive express...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/00G01N25/14G01N33/24
CPCG01N25/00G01N25/14G01N33/24
Inventor 严健何川晏启祥徐国文蒙伟张钧博马杲宇
Owner SOUTHWEST JIAOTONG UNIV
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