Testing method for loose circle of surrounding rock based on drilling energy

Abstract

The invention discloses a drilling energy-based surrounding rock loosing circle test method which mainly comprises the following steps: drilling surrounding rock by a digital drilling machine, recording in real time the relationship between drilling distance and time and the relationship between drilling power and time; according to the above data, calculating the rock drilling needed energy per unit volume at arbitrary position; and determining the surrounding rock loosing circle scope according to the change of the drilling energy. According to the method, the surrounding rock loosing circle scope can be measured in the drilling process, the method is simple, strong in operability and low in cost; the method is in no need to drill a complete drilled hole in advance, and is not influenced by the factors of hole collapse and the like, proper functioning can be performed even the surrounding rock is extremely broken, and the method has important significance for tunnel dynamic reinforcement design.

Description

technical field [0001] The invention relates to underground engineering detection fields such as mines, transportation, and water conservancy, and in particular relates to a brand-new testing method for surrounding rock loose circles. Background technique [0002] After the excavation of underground engineering, a roughly ring-shaped broken zone will be formed in the rock mass around the tunnel and chamber, which is called the loose circle. The size of the loose circle directly affects the support difficulty of underground engineering, the larger the scope of the loose circle, the more difficult the support. Especially in tunnel engineering, real-time testing of loose circles is of great significance for dynamic support design of tunnels. [0003] There are many methods for measuring loose rings, which can be roughly divided into two categories: one is the observation and comparison method, and the other is the physical detection method. [0004] (1) Direct observation and...

AI Technical Summary

Problems solved by technology

The advantages of ground radar method testing are that no drilling is required, high precision, efficiency and resolution, flexible and convenient, intuitive profile, fast testing, and the location map of cracks can be obtained on site, and the range of loose circles can be obtained; the disadvantage is that the instrument is expensive

[0012] In the process of on-site construction, most of the above methods require drilling in advance and then testing. The testing is expensive and time-consuming. When the surrounding rock is relatively broken, the drilling is difficult to form, which leads to the failure of the test.

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