An in-situ microscopic observation device and method for engineering rock mass mesoscopic cracks

Abstract

The invention relates to an in-situ microscopic observation device and method for mesoscopic cracks in surrounding rocks of engineering rock mass. When the observation device is working, the microscopic probe is driven by a rotating motor to rotate circumferentially in the borehole; One week later, the control box controls the advancing mechanism to advance along the guide rail, and the microscopic probe advances along the axial direction of the borehole along with the advancing mechanism for a line-of-sight distance, and the above steps are repeated until the entire borehole is observed. Using the microscopic probe instead of the traditional observation probe, the observation of mesoscopic cracks in the in-situ rock mass of the roadway is realized, which effectively avoids the defects of laboratory observations, and obtains the real distribution of the mesoscopic cracks in the surrounding rock, which is very important for the research of the roadway. Grouting support and so on have great guiding significance. The multi-module joint control method can control the microscopic probe to realize automatic rotation and advancement, which effectively solves the harsh manual operation conditions caused by the small observation area of ​​the microscopic probe, and effectively saves manpower and complexity of use.

Description

technical field [0001] The invention relates to an engineering rock mass fissure observation device and method, in particular to an in-situ microscopic observation device and method for engineering rock mass surrounding rock mesoscopic fissures, belonging to the field of engineering rock mass control. Background technique [0002] In underground coal mining, tunnel construction and other underground projects, in-situ fracture observation is widely used as an important technical means. It can obtain the development of cracks in engineering rock mass, especially the development of mesoscopic cracks in engineering rock mass. , provide a basis for obtaining the initial damage of the rock mass and the evolution of mesoscopic cracks after loading, provide real and reliable technical support for the stability control of surrounding rocks and disaster prevention, etc. important role. [0003] However, the in-situ observation of surrounding rock fractures has the following problems:...

AI Technical Summary

Problems solved by technology

[0004] 1. The downhole in-situ fracture observation device mainly adopts the traditional borehole peeping device, but the peeping probe used in the traditional borehole peeping device can only capture the distribution of macroscopic fissures with a size larger than 1mm, and cannot observe the size of 0.01mm. The distribution of micro-cracks, such as the observation device shown in Chinese patent CN106437680A, can realize the in-situ observation of cracks, but the device used can only capture the macro-cracks that can be observed by the naked eye, but cannot capture the smaller-sized cracks. Therefore, conventional in-situ observation devices cannot obtain the distribution of mesoscopic fractures in the surrounding rock

[0005] 2. Most of the existing mesoscopic fracture observations are carried out in the laboratory after on-site sampling. For example, the device and technology shown in Chinese patent CN103163134A, the sample is brought back to the laboratory for observation. distribution, but this method causes re-destruction of the rock, and cannot obtain the true distribution of in-situ fractures in the surrounding rock

[0006] 3. To obtain microscopic cracks, a microscopic probe with high magnification is required, but the microscopic probe can only have a small observation field due to its high magnification

However, the original crack observation devices mostly use manual pushing probes for observation, which is obviously not suitable for microscopic probes

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