| Due to the inherent particularity of the drivage and supporting of roadways in weak and broken surrounding rocks, they are always tough condundrums in the engineering geomechanics. The drivage and its supporting have direct relations with the quality of surrounding rock. And the different scheme of drivage and support could determine the efficiency of the whole engineering construction. Currently, the traditional ways of geological detection and exploration, such as geotechnical boring and advanced detection, always are used in the mine construction. However, these traditional methods have some faults, like short survey distance, slow construction and safety faults. These faults could lead to large economic losses even casualties when the drivage meet unfavorable geology such as faults, weak-fracture zones and ponding cavity.Based on this situation, the research of speedy drivage in Sanmenxia Bauxite was studied to accelerate the driving openings safely and effectively, aiming to the general problem of drivage in weak and broken surrounding rocks. Combined with site investigation, rock laboratory tests, advanced geological detection test and supporting scheme designs and its applications, this research thesis contained two main parts. One of them is advanced geological detection technology research, and the other one is the system optimization of support. The study results include as follows.1) In Sanmenxia bauxite mine rock stratum, five type of rock mass,that is bauxite rock, limestone, ferruginous shale, grapholith, carbonaceous shale, compose the most of the weak and crumbly strata in mining operation area. Hence rock overall quality in mining area is of lower quality due to structural fracture in stratum and rock layer, in addition the rock layer’s distribution is much complicated lead to the poor condition for project construction.2) The major realistic difficult problem in the construction is the supporting efficiency which is at very low level and cannot afford the requirements of mine infrastructure, especially when fabrication encounter large fault, stagnant weak-fracture zones or ponding cavity. To study and explore solution to this problem, two aspect of job are extremely urgent, one of which is more accurate and reliable advanced geological detection, research new more efficient roadway supporting scheme programs3) TRT6000advanced geological detection forecast require no drilling and explosive consumables, further more it is highly repetitive and reliable safety. In addition the TRT6000have high-precision acceleration sensors so that the process is nearly none of disturbance, thus the seismic wave signal obtained is true and reliable, detection results and the measurement is of accuracy and sensitivity, consequently detection distance will be improved.The image formation principle of TRT6000is tomographic scan imaging technology, by calculating the propagation time parameter of superimposed wave velocity and seismic wave data, to deduce the reflection interface characteristic which mainly comprise the position, size and shape. Finally form the three-dimensional maps of advanced geological detection forecast.4) Industrial experiment of Advanced geological detection forecast indicate the powerful and flexible functions of TRT6000. The response and results are of high accuracy and precision, the geological formations forecast can provide guidance and help in mine construction. The advanced detection technology of TRT6000can be promoted for all types of roadway in the mine to avoid security accident, this will improve the construction efficiency and accelerate the production of the mine.5) According to the actual rock conditions in mine, this thesis propose two new supporting schemes, one of which is Steel Fiber Reinforced Shotcrete supporting and the other one is advanced Leading ductule grouting combined with anchor d Shotcrete supporting. After that analysis and optimize detailed Specifications of those two supporting scheme. Finally, by the means of industrial experiment in the project practice in roadway drivage construction, the results of the experiment indicate that the new two scheme work well and have significant effect for the construction. The results of this research provide an important guiding for similar construction excavation and provide new ideas and methods for supporting theoretical research, as well as to the Roadway excavation in the weak broken rock conditions52Figures,25Tables,80Reference... |
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