Drilling parameters optimization of pick-shaped TCT for raising boring construction of Feng Ning pumped storage power station

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Tan, Hao^1^2 ; Liu, Zhi Qiang^2 ; Tan, Jie^2 ; Meng, Yi Ping^3

University of Science and Technology Beijing, Beijing

100083, China^1

Beijing China Coal Mine Engineering Co. Ltd, Beijing

100013, China^2

Hefei University of Technology, An Hui Hefei

230009, China^3

关键词: Coarse-grained;    Drilling parameters;    Drilling pressure;    Pumped storage power station;    Rock breaking mechanism;    Rock conditions;    Rock fragmentation;    Specific energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/6/062023/pdf
DOI  :  10.1088/1755-1315/237/6/062023

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Under the condition of Feng Ning coarse-grained granite, the consumption of tungsten-carbide-tipped(TCT) cutters in the construction of guide shaft by raising boring machine will be quicker than that of similar projects in the past. In order to ensure the wear resistance and efficiency of breaking rock of the tungsten-carbide-tipped cutter, the pick-shaped TCT can be used in the projects of this kind of rock conditions. Therefore, it is necessary to study the TCT shape, footage and efficiency of breaking rock. In this paper, by studying the rock breaking mechanism of cone-shaped TCT and pick-shaped TCT, numerical simulation and experimental study are carried out on penetration depth, rock fragmentation volume, specific energy and maximum weight of rock debris of cone-shaped TCT and two kinds of pick-shaped TCT under drilling pressure. The results show that the penetration depth of the 3 kinds of TCT increases non-linearly with the increase of drilling pressure in Feng Ning coarse-grained granite. The penetration depth of pick-shaped TCT is deeper than that of cone-shaped TCT, and the penetration depth of pick-shaped tip No.1 with smaller profile angle is the biggest, and the efficiency of breaking rock is better under larger thrust. The rock fragmentation volume of the 3 types of TCT increases non-linearly with the increase of drilling pressure, and the rock fragmentation volume of pick-shaped tip No.1 is the biggest, while that of cone-shaped TCT is the smallest. When the drilling pressure changes, the change trend of specific energy of different tip shapes is not the same: the specific energy of cone-shaped TCT increases slowly with the increase of drilling pressure, while the specific energy of pick-shaped TCT increases first and then decreases slowly with the increase of drilling pressure. These three shapes of tip will produce obvious rock debris under certain drilling pressure, and the maximum weight of rock debris produced by the three shapes of tip is close to each other when the drilling pressure reaches 40kN.