Novel method for identifying crustal stress abnormal area and measuring crustal stress in large range

Abstract

The invention belongs to the technical field of protolith stress measurement, and discloses a novel method for identifying a crustal stress abnormal area and measuring crustal stress in a large range,which comprises the following steps of: measuring protolith stress of reference points, calculating protolith stress of each reference point and the position of each reference point, and calculatingthe protolith stress in the whole area to be measured, drawing a protolith stress region distribution diagram in the region; marking the positions of the arranged to-be-measured points in the protolith stress area distribution diagram; drilling rock samples in different directions required for measuring crustal stress by an acoustic emission method; measuring the protolith stress by adopting a method of combining acoustic emission and characteristic stress, if the difference between a measurement result and an interpolation inversion result is large, recording the point as a protolith stress abnormal point, and measuring the protolith stress of the point by using a trepanning stress relieving method. The method is low in economic cost, high in technical applicability and simple in construction environment, the economic cost and workload can be effectively reduced, and basic data can be provided for design optimization and stability calculation of underground rock engineering.

Description

technical field [0001] The invention belongs to the technical field of original rock stress measurement, and in particular relates to a new method for identifying abnormal areas of in-situ stress and measuring in-situ stress in a large range. Background technique [0002] At present, under the action of long-term gravity and tectonic movement, complex in-situ stress field has been formed. This undisturbed in-situ stress is called natural stress, also known as initial stress and original rock stress. It is the fundamental force that causes the deformation and destruction of various underground rock engineering surrounding rocks, and is one of the most important factors that determine the physical and mechanical properties of engineering rock mass. Only after obtaining the stress information of the original rock in the area where the underground rock engineering is located, can the stability of the rock engineering be calculated and analyzed, and then the excavation design opt...

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Problems solved by technology

[0020] (1) The existing casing stress relief method is relatively harsh on the working environment and construction requirements, the measurement process is complicated, and the test cost is relatively high. Usually, only a few points of important rock engineering can be measured

[0021] (2) The existing hydraulic fracturing method is expensive, and is generally only used for rough measurement of in-situ rock stress before construction design of large-scale rock engineering

[0022] (3) The reliability of acoustic emission method measurement is poor and the accuracy is limited

[0023] (4) Geophysical detection methods have relatively large limitations, and it is difficult to guarantee the reliability and accuracy of measurement

[0024] The difficulty of solving the above problems and defects is: the defects of the above measurement methods are caused by the theoretical foundation. At present, the scientific level has not yet reached the height of theoretical breakthroughs, so it is impossible to solve the above problems and defects from a theoretical breakthrough.

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