Quick surrounding rock stress measuring method applicable to buried circular tunnels

A technology of surrounding rock stress and tunneling, which is applied in the field of rapid measurement and calculation of surrounding rock stress in deeply buried circular tunnels. It can solve problems affecting construction progress, drilling deformation, and large drilling diameter, etc., and achieves the effect of convenient operation.

Active Publication Date: 2012-12-19
WUHAN UNIV
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Problems solved by technology

The stress relief method requires operations such as drilling, trapping rock cores, and installing sophisticated electronic instruments. The measurement cycle is long, and it will affect the construction progress when used near the face of the cavern, and cannot meet the real-time dynamic requirements; and due to the deep rock mass High ground stress, severe drilling deformation, and core fractures lead to d

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  • Quick surrounding rock stress measuring method applicable to buried circular tunnels
  • Quick surrounding rock stress measuring method applicable to buried circular tunnels
  • Quick surrounding rock stress measuring method applicable to buried circular tunnels

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention is further described: According to Figure 1-8 As shown, a method for quickly calculating surrounding rock stress suitable for deeply buried circular tunnels, the steps are as follows:

[0031] A deeply buried circular tunnel with a diameter of 10m is excavated in an infinite mountain, such as figure 1 As shown, the magnitude and direction of the maximum principal stress 2 on the face of the face and the minimum principal stress 3 on the face of the face are unknown.

[0032] During the blasting process of the full-section of the circular tunnel, the layout of the blast holes is determined by the blasting scale, blasting effect and blasting safety. In this embodiment, 2 circles of cutting blastholes, 3 circles of caving blastholes, 1 circle of buffer blastholes and 1 circle of peripheral smooth blasting blastholes are sequentially arranged on the excavation face 1 from the center of the circle to the...

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Abstract

The invention discloses a quick surrounding rock stress measuring method applicable to buried circular tunnels. The method includes: setting each circle of spallation blastholes, buffering blastholes and smooth blasting blastholes to be detonated in two sections, determining main stress on a tunnel face to determine axial stress of the tunnel according to the maximum main stress on the tunnel face. The quick surrounding rock stress measuring method applicable to the buried circular tunnels has the advantages that conventional blasting operations and vibration monitoring are utilized, no extra equipment is needed, operation is convenient, and real-time and dynamic estimation of the surrounding rock stress close to the tunnel face during blasting construction can be realized. The quick surrounding rock stress measuring method applicable to the buried circular tunnels is mainly applicable to quick measuring of the surrounding rock stress of the deep buried underground constructions in the field of hydropower, communication, mines and the like.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for quickly measuring and calculating surrounding rock stress suitable for deeply buried circular tunnels. Background technique [0002] With the further deepening of hydropower development in Southwest my country and the increasing depth of mining of mineral resources, engineering geological disasters induced by high ground stress during the excavation of deep tunnels are becoming more and more common and serious. In order to predict the occurrence of rock mass instability failure and rockburst, and to provide a basis for rock mass support and reinforcement, it is necessary to dynamically grasp the stress magnitude and direction of the surrounding rock near the tunnel face in real time during cavern construction. The existing in-situ stress measurement methods can be roughly classified into three categories according to their measurement principles: the...

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Application Information

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IPC IPC(8): G01L1/00
Inventor 卢文波杨建华严鹏陈明胡英国
Owner WUHAN UNIV
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