Abstract
The mine geostress measurement is the indispensable key to safe and efficient production of the mine. Currently, stress relief method, hydraulic fracturing method and acoustic emission method are widely used in mine geostress test fields. As deficiencies of the above several methods, the author designed a detailed borehole acoustic program for the tectonic fault conditions of a mine in Huainan, and got geostress parameter values according to the combination of site measured velocity values and laboratory tests.
Highlights
As a natural stress in the earth without engineering disturbance, the geostress is the basic force which causes deformation and failure of underground or opencast geotechnical engineering
The geostress measurement is a necessary prerequisite to determine engineering properties of soil mechanics which carry out rock stability analysis and make the program of the excavation of geotechnical engineering scientific [1]
According to the measuring principle, it can be divided into three categories: the first methods which can inverse geostress are based on measuring strain and deformation of rock mass in combination with rock mechanics properties; the second is the geophysical methods which are based on the determination of acoustic emission, seismic wave velocity and the resistivity that are caused by geostress; the final methods use the information provided by the geological structure and damage status of underground rock mass
Summary
As a natural stress in the earth without engineering disturbance, the geostress is the basic force which causes deformation and failure of underground or opencast geotechnical engineering. The geostress measurement is a necessary prerequisite to determine engineering properties of soil mechanics which carry out rock stability analysis and make the program of the excavation of geotechnical engineering scientific [1]. The mine geostress is the prime reason to cause the deformation and damage of country rock and supporting structure. According to the measuring principle, it can be divided into three categories: the first methods which can inverse geostress are based on measuring strain and deformation of rock mass in combination with rock mechanics properties; the second is the geophysical methods which are based on the determination of acoustic emission, seismic wave velocity and the resistivity that are caused by geostress; the final methods use the information provided by the geological structure and damage status of underground rock mass. Deep rock geostress can be measured by borehole acoustic method, it gets people’s attention
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