凿岩机钻头破岩机理分析及岩体可掘性预测  

Analysis of rock breaking mechanism of rock drill bit and prediction of rock drillability

作　　者：尤明龙 谭飞 焦玉勇 涂福彬 田湖南[2] YOU Minglong;TAN Fei;JIAO Yuyong;TU Fubin;TIAN Hunan(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《武汉大学学报（工学版）》2023年第2期160-169,共10页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51879245)。

摘　　要：为分析凿岩机钻头的破岩机理,提高破岩效率,预测掘进岩体的等级,运用离散元方法对凿岩机钻头的破岩过程进行分析。模拟了不同级别围岩、不同地应力条件下的破岩过程,得到了不同类型围岩下的钻进破岩力及其破岩比功。对影响岩体等级的岩体主要参数进行敏感性分析,得到了峰值破岩力和均值破岩比功与岩体单轴抗压强度的关系、岩体单轴抗压强度与场切深指数(field penetration index, FPI)的关系。通过FPI值的范围对岩体进行可掘性预测和围岩质量分级。研究成果可为实际工程使用凿岩机开挖过程中的岩体可掘性评价及围岩动态分级提供一定参考。In order to analyze the rock breaking mechanism of the rock drill bit, improve the rock breaking efficiency, and predict the grade of the excavated rock mass, the discrete element method is employed to simulate and analyze the rock-breaking process of rock drill bit. The rock breaking process under different grades of surrounding rock and different in-situ stress conditions is simulated, and the rock breaking force and rock crushing specific work under different types of surrounding rock are obtained. Then, the sensitivity analysis of the main parameters of rock mass that affect the basic quality of rock mass is carried out. The relationship between the peak rock breaking force and the mean rock crushing specific work and the uniaxial compressive strength of the rock, and the relationship between the uniaxial compressive strength of the rock and the field penetration index(FPI) are obtained. Finally, the rock drillability is predicted and the quality of surrounding rock is classified by the range of FPI value. The results can provide some reference for the evaluation of rock drillability and the dynamic classification of surrounding rock in the excavation process of rock drill.

关 键 词：凿岩机 破岩机理 岩体分级 岩体可掘性 离散元 

分 类 号：TU457[建筑科学—岩土工程]