A rapid method for in-situ determination of surrounding rock strength in coal mine roadway
A technology for rapid measurement and mine roadway, applied in testing machinery, earth-moving drilling and other directions, can solve the problems of complex operation, long cycle, rapid incompatibility with rock strength measurement technology, on-site in-situ and other problems, achieving good effect, simple method, Easy-to-use effects
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[0015] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0016] The in-situ rapid determination method for the surrounding rock strength of coal mine roadway of the present invention includes the use of rock drills and supporting drills. In order to eliminate the influence of rock drill characteristics and thrust on the drilling speed during the drilling process, the rock drills required for drilling in the test are uniformly used. Air-leg pneumatic rock drill (YTP-26) and standard drill bit (length 2.2m, drill bit diameter 42mm), drilling tools can also choose the rock drill and supporting drill bit used in the field construction. Specific steps are as follows:
[0017] a. Firstly, data collection is carried out. Under the conditions of newly exposed surrounding rock 1 or similar lithology conditions in the roadway excavation, 2 to 4 rock samples are collected as a group, and the group of rock samples is numbere...
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