High ground stress interbed soft rock tunnel failure mechanism and construction control research method

Abstract

The invention discloses a high ground stress interbed soft rock tunnel failure mechanism and construction control research method. The method comprises the following steps: 1, establishing a numerical model; 2, analyzing the stability of the surrounding rock of the apex mountain tunnel; 3, analyzing the stability of the initial support of the apex mountain tunnel; 4, analyzing a failure mechanism of the high-ground-stress interbed soft rock tunnel; 5, implementing an apex mountain tunnel monitoring and measuring scheme; 6, analyzing a field monitoring and measuring result, wherein the deformation of the surrounding rock generally presents a rule that the horizontal convergence is greater than the vault settlement, the horizontal convergence value and the rate are greater than the vault settlement amount and the settlement rate, and the vault settlement amount tends to be stable earlier than the horizontal convergence value and is consistent with the numerical simulation surrounding rock deformation rule; the overall rules are consistent, so that certain reasonability is achieved, and meanwhile it is verified that the supporting mode of section optimization, advanced reinforcement and variable-section spray layer has a good effect on supporting of the high ground stress interbed soft rock tunnel.

Description

technical field [0001] The invention relates to the technical field of tunnel damage and construction, in particular to a research method for the damage mechanism and construction control of high ground stress interbedded soft rock tunnels. Background technique [0002] The Jianshan Tunnel is located near Dayingshui to Shuiquan Town, Pingchuan District, Baiyin City, Gansu Province, passing through the Shuiquan Jianshan Mountains. The starting and ending mileage of the tunnel is DK109+810~DK115+812, with a total length of 6002m and a maximum buried depth of about 519m (DK112+780). The lithology of the strata in the tunnel area is relatively complex, mainly composed of sedimentary rock and metamorphic rock. The exposed strata in the area mainly include Quaternary loose accumulation layers, middle Jurassic Honggou Formation sandstone interbedded with mudstone; Devonian Middle and Lower Xueshan Group sandstone interleaved with conglomerate; Silurian Lower Magouying Formation S...

AI Technical Summary

Problems solved by technology

[0008] In the research on the reasonable form of the support structure, several support methods with good effects on the deformation of interbedded soft rock tunnels with high ground stress have been proposed theoretically, but the actual engineering environment is often more complex and the influencing factors are more complex. Therefore, it is necessary to conduct field tests on the actual effects of these support methods to verify and improve them.

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