Monitoring method for relative magnitude of extrusion stress being surrounding rock pressure between tunnel preliminary bracing and surrounding rock

A technology of initial support and extrusion stress, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of inability to use on a large scale, inconvenient installation, high requirements, easy to grasp by construction technicians, low cost, construction interference small effect

Inactive Publication Date: 2019-09-20
FUZHOU UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a monitoring method for the relative size of the compressive stress (surrounding rock pressure) between the initial support of the tunnel and the surrounding rock, so as to solve the cost of the traditional method of monitoring through the earth pressure cell mentioned in the above background technology. High, inconvenient installation, high requirements, unable to be widely adopted

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  • Monitoring method for relative magnitude of extrusion stress being surrounding rock pressure between tunnel preliminary bracing and surrounding rock
  • Monitoring method for relative magnitude of extrusion stress being surrounding rock pressure between tunnel preliminary bracing and surrounding rock
  • Monitoring method for relative magnitude of extrusion stress being surrounding rock pressure between tunnel preliminary bracing and surrounding rock

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Embodiment 1

[0022] During the construction process, for the sections that need to know the relative size and distribution of the compressive stress (surrounding rock pressure) between the initial support and the surrounding rock (including the section where the initial support has not formed a ring and the section where the initial support has formed a ring), use Electromagnetic radiation monitoring sections are set at regular intervals, and the interval between electromagnetic radiation monitoring sections is generally set at 5m. Electromagnetic radiation monitoring points are arranged at representative positions on each section, such as image 3 and Figure 4 As shown, before the inverted arch is backfilled, the electromagnetic radiation monitoring points are generally arranged at the vault 1, the left arch waist 2, the right arch waist 3, the left wall 4, the right wall 5, the left arch foot 6, the right foot 7 and the middle of the inverted arch 8. After the inverted arch is backfille...

Embodiment 2

[0026] A railway tunnel is 14755m long and has a maximum buried depth of 1240m. The surrounding rock is mainly schistosed basalt, which is strongly compressed by large-scale geological structures. The residual structural stress in the tunnel site area is large, and the surrounding rock is broken and metamorphic. Cleavage development, poor stability. Serious large deformations occurred during the tunnel construction, with the maximum unilateral convergent deformation amounting to 87cm, and the deformation of the surrounding rock basically took about 70 days to reach stability. Severe large deformation caused primary support invasion, and secondary arch replacement was carried out in some sections. Due to the high in-situ stress in the tunnel site area and the complex and changeable geological conditions, the distribution of the compressive stress (surrounding rock pressure) between the primary support and the surrounding rock is also complex and changeable, which brings great d...

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Abstract

The invention discloses a monitoring method for the relative magnitude of the extrusion stress being the surrounding rock pressure between a tunnel preliminary bracing and a surrounding rock. The method comprises: step one, during the construction process, arranging electromagnetic radiation monitoring sections at certain cycle intervals for a zone that includes a preliminary bracing non-cyclic section and a preliminary bracing cyclic section and has the relative magnitude of the extrusion stress being the surrounding rock pressure between the tunnel preliminary bracing and the surrounding rock and a distribution rule that need to be obtained, and arranging electromagnetic radiation monitoring points at representative positions on all sections; and step two, monitoring electromagnetic radiation intensities of different monitoring periods at the tunnel bracing structure surfaces of all monitoring points. The monitoring method is simple; since no device needs to be preburied, the disturbance to construction is low; the on-site construction technicians can obtain the information easily; the cost is low; and the method can be applied widely and can adapt to the variable characteristic of the surrounding rock and geological conditions under the complicated geological conditions.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a method for monitoring the relative size of extrusion stress (surrounding rock pressure) between the primary support of a tunnel and surrounding rock. Background technique [0002] With the continuous advancement of railway and highway construction, it is inevitable to build long tunnels in areas with harsh geological environments and weak surrounding rocks with high ground stress. When tunnels are built in weak surrounding rocks with high ground stress, the problem of large deformation of surrounding rocks often occurs. The Jiazhuqing Tunnel on the Nankun Railway, the Wushaoling Tunnel on the Lanzhou-Xinjiang Double Line, the Tauern Tunnel in Austria, and the Nakaya Tunnel in Japan have all experienced large deformation problems in the tunnels. In the construction of underground projects in high ground stress areas, the biggest problem is the contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/25G01L1/26
CPCG01L1/25G01L1/26
Inventor 刘成禹闫红江罗洪林邓志刚
Owner FUZHOU UNIV
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