A Laboratory Test Method for Assessing Rock Mass Strength in Deep Engineering
A technology of rock mass strength and indoor testing, applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, instruments, etc., can solve problems such as inconsistency and maintenance of excavation elastic stress
Active Publication Date: 2019-11-22
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
[0003] The current assessment of rock strength and deformation in the rock mass excavation disturbance area is basically based on the results of uniaxial or conventional triaxial compression tests. The lateral stress in the experiment remains unchanged. Obviously, the stress path of the test is consistent with the excavation elastic stress. does not match
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[0035] In order to make the implementation technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0036] In order to better understand the embodiments of the present invention, the defects of the prior art will be described below in combination with formulas.
[0037] Under the initial formation stress, the rock mass stress is basically close to its initial equivalent spherical stress (Such as figure 1 shown), the initial stress solution of the rock mass is shown in formula (1).
[0038]
[0039] After the excavation of the deep rock mass, the original stress balance of the rock mass is broken; under the excavation disturbance, the stress readjustment and redistribution of the rock mass occur (such as figure 2 shown). According to the boundary conditions of the disturbance zone, the Lame-Naiver equation can be solved to obta...
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The invention discloses an indoor test method for evaluating the strength of rock mass in deep engineering. It belongs to the field of rock mechanics and engineering testing and is used to evaluate the mechanical stability and support safety issues of rock mass excavation in deep engineering. It includes two steps: equivalent spherical stress state application and equivalent spherical stress loading and shearing; the equivalent spherical stress state application is calculated based on the in-situ stress of deep engineering to obtain its equivalent spherical stress, and the spherical stress is applied to the rock or concrete. Stress value; the spherical stress value is constant when it reaches the equivalent spherical stress. At this time, the vertical stress can be loaded and the lateral stress can be reduced until the specimen is damaged. The invention calculates the equivalent spherical stress based on the in-situ stress of deep engineering, and obtains the shear strength of rock or concrete under the path through equivalent spherical stress loading and shearing, thereby realizing the mechanical strength and deformation of rock or concrete in deep engineering. The assessment of behavior ultimately serves the mechanical stability and support safety assessment of deep rock engineering.
Description
technical field [0001] The invention relates to an indoor test method for evaluating the rock mass strength of deep engineering. Background technique [0002] Deep underground energy development and underground storage of strategic resources are new directions for the adjustment of my country's energy strategic deployment. This adjustment will further develop engineering construction activities into deep underground. Deep engineering construction is faced with different geological environment and engineering construction conditions from shallow engineering, so it is necessary to develop new methods and technologies to evaluate the stability of excavated rock mass in deep engineering, chamber safety and corresponding support evaluation . [0003] The current assessment of rock strength and deformation in the rock mass excavation disturbance area is basically based on the results of uniaxial or conventional triaxial compression tests. The lateral stress in the experiment rema...
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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019G01N2203/0087G01N2203/0254G01N2203/0266
Inventor 刘造保冯夏庭张凤鹏李正伟
Owner NORTHEASTERN UNIV LIAONING