Determination method for magnitude and direction of crustal stress

Abstract

The invention discloses a determination method for magnitude and direction of a crustal stress. The determination method comprises the following steps: arranging three strain rosettes in the peripheral direction on an epoxy resin hollow inclusion for measuring the stress, wherein the included angle between adjacent strain rosettes is 120 degrees, four strain gages are arranged on each strain rosette, and the strain gages on each strain rosette are arranged by rotating 45 degrees in sequence; carrying out pore-forming; carrying out hole flushing; carrying out installation of a stress gage: feeding the hollow inclusion into a measuring hole in an orientation mode, so that the gap between the stress gage and a rock drill hole is filled with a binding agent; carrying out stress relieving: after the binding agent is solidified, carrying out drill relieving by using a diamond drill bit sleeve, and adopting the strain gage to record data in the relieving process according to the relieving depth in the test process. According to the determination method, twelve strain values of difference directions in the peripheral direction are utilized, so that the crustal stress and the stress direction can be accurately and effectively calculated, extremely effective help is provided for guiding mine construction, and the mine safety is further improved.

Description

technical field [0001] The invention relates to a method for measuring and calculating geostress, in particular to a method for determining the magnitude and direction of geostress. Background technique [0002] In the past 20 years, underground engineering in many countries in the world has carried out the measurement and application research of in-situ stress, whether it is in structural geology, earthquake prediction and geodynamics research, or in mining, underground engineering and energy development. They have played an increasingly important role in practice, and are increasingly valued by academic and engineering circles at home and abroad. [0003] For mining, in-situ stress is the fundamental force that causes deformation of surrounding rock in mining engineering, damage and destruction of support structures, and occurrence of mine dynamic phenomena. Among many factors that affect the stability of mining engineering, in-situ stress is the most important and fundame...

AI Technical Summary

Problems solved by technology

In the past, the influence of ground stress was rarely considered in the design and construction of mining projects. However, with the continuous expansion of mining scale and continuous development to the depths, the influence of ground stress will become more serious. The impact of ground stress on underground engineering design and construction is not considered. impact, often resulting in large deformation of the surrounding rock of the underground roadway, collapse of the stope, rock burst and other mine dynamic phenomena, which seriously affect the safe production of the mine

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