Prediction method for rock mass excavation disturbance area and related equipment

Abstract

The embodiment of the invention provides a prediction method for a rock mass excavation disturbance area and related equipment. The prediction precision of the rock mass excavation disturbance area can be improved. The method comprises the following steps: performing ultrasonic testing and borehole camera shooting observation on a target rock mass to obtain a first wave velocity hole depth curve, a second wave velocity hole depth curve, a first borehole wall image and a second borehole wall image; determining a first P wave velocity and a second P wave velocity according to the first wave velocity hole depth curve and the second wave velocity hole depth curve; determining a first initial value and a second initial value of a rock mass quality grade system parameter according to the first drill hole wall image and the second drill hole wall image; checking and revising the first initial value and the second initial value according to the first P-wave speed and the second P-wave speed; determining mechanical parameters of the target rock mass according to the checked and revised first initial value and the checked and revised second initial value; and predicting the excavation disturbance area corresponding to the target rock mass according to the mechanical parameters of the target rock mass.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for predicting a rock mass excavation disturbance area and related equipment. Background technique [0002] The excavation damage zone (EDZ) in underground engineering refers to the area where the mechanical and hydraulic properties of rock mass undergo measurable and irreversible changes after excavation. The EDZ range is an important parameter for optimizing the excavation and support scheme of deep caverns. Compared with traditional engineering practices and empirical methods, the support design based on the EDZ range can greatly reduce the support cost. Therefore, it is of great significance to accurately predict the EDZ range during the excavation of deep caverns for deep underground rock mass engineering projects. [0003] Many on-site measurement techniques have been successfully applied to EDZ measurement in deep engineering practice, among whi...

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Problems solved by technology

[0004] However, in complex deep underground structures, such as high side walls, long-span caverns, and long tunnel projects, due to many constraints such as economy, time, and site conditions, these in-situ measurement techniques can only measure around specific measuring points or sections. EDZ range in the rock mass, obtaining incomplete measurement data, which in turn leads to inaccurate prediction of the EDZ range

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