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Alternative TitleInfluence of rock mass strength on volume and shape of fragmental pit generated by a single tooth of roller bit
郭汝坤; 冯春; 李战军; 李世海
Source Publication岩土力学
Other AbstractBased on a continuous-discontinuous element method(CDEM), this paper is to discuss fracture mechanism of rocks under compressive loading applied by a single tooth of roller bit. The CEDM is then applied to investigate the fracture evolution process of rock mass under compressive loading, and to analyze the effect of cohesion, internal friction angle on rock fragmental volume and the patterns of fragmental pit. Numerical results show that the shape of fragmental pit is basically a semi-ellipsoid and the ratio of width to depth of the fragmental pit is only affected by the internal friction angle. With the increase of internal friction angle, the ratio of width to depth decreases gradually. The width and depth of fragmental pit and the volume of fragment can be described by the single tooth pressure F, tooth radius r, cohesion c and internal friction angle j. By considering the rock damage influenced by several bits which are in contact with rock simultaneously, the correction coefficient of single tooth fragmental volume is introduced. Then the relationship between operating parameters of roller bit(i.e., axial force of drill pipe, rotational speed and drilling speed) and rock mass strength(i.e., cohesion and internal friction angle) is established. Field experiments are conducted at the south mining area of Anqian mine, and the rock fragmental volumes of different rock properties are obtained. The corresponding cohesive strength and internal friction angle of the rock mass are obtained by laboratory tests. When the correction factor is 0.363, the field testing results coincide well with the theoretical results, which demonstrates the validity of numerical analysis and formula derivation. The results will be used for the field test of dynamic strength of rock mass.
KeywordRock Fragmental Volume Under Single Tooth Rock Fracture Mechanism Continuous-discontinuous Element Method (Cdem) Drilling Speed Strength Of Rock Mass Shape Of Fragmental Pit
Indexed ByCSCD
WOS Keywordrock fragmental volume under single tooth ; rock fracture mechanism ; continuous-discontinuous element method (CDEM) ; drilling speed ; strength of rock mass ; shape of fragmental pit
Funding Organization国家重点基础研究发展计划项目(973计划) ; 中国科学院战略性先导科技专项(B类) ; 广东宏大爆破股份有限公司"基于数字模拟的露天爆破设计软件"研发项目资助
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Document Type期刊论文
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GB/T 7714
郭汝坤,冯春,李战军,等. 岩体强度对牙轮单齿作用下破碎坑的体积及形态影响研究[J]. 岩土力学,2016,37(10):2971-2978.
APA 郭汝坤,冯春,李战军,&李世海.(2016).岩体强度对牙轮单齿作用下破碎坑的体积及形态影响研究.岩土力学,37(10),2971-2978.
MLA 郭汝坤,et al."岩体强度对牙轮单齿作用下破碎坑的体积及形态影响研究".岩土力学 37.10(2016):2971-2978.
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