贯入角度对截齿破岩性能与几何排布的影响研究

截齿贯入角度是双轮铣槽机布齿系统设计中的关键因素之一。基于连续?非连续单元法（CDEM），建立截齿不同角度冲击贯入破岩的数值模型，通过断裂能本构模型实现岩体弹性?损伤?断裂的破裂过程，开展截齿有效角度50º～90º区间内的9组冲击贯入破岩模拟，研究贯入角度对截齿破岩性能的影响规律，讨论贯入角度对截齿几何排布的影响，总结布齿系统的截齿几何排布规律。结果表明，当贯入角度从90º降低到50º时，岩体由张拉?拉剪破裂向剪切?拉剪破裂转变，截齿平均贯入力与破碎程度提高，截齿的跃进式侵入特性的显著性减低；贯入角度为75º～90º的第I类截齿与小于55º的第III类截齿在破岩中起辅助作用，贯入角度为55º～75º的第II类截齿可在岩体内部产生范围较大的水平非贯通裂隙，在布齿系统破碎岩体过程中发挥主要作用；2个第II类截齿先后贯入岩体可较好地破碎截线间的岩体，可构成一类基本破岩单元，多个基本破岩单元按照正弦线形式排布，由此形成了一种布齿系统设计方法。研究成果为完善双轮铣槽机布齿系统设计方法，打破国外在双轮铣槽机布齿系统设计方法上的技术壁垒提供了理论基础。

Influence of penetration angle on rock breaking performance and geometrical arrangement of picks

The penetration angle of pick is one of the key factors in the design of tooth arrangement system of double-wheel trench cutter. Based on the continuum-discontinuum element method (CDEM), a numerical model for picks to penetrate the rock at different angles is established, and the elastic-damage-fracture fracture process of rock mass is realized by the fracture energy constitutive model. Nine groups of impact penetration rock breaking simulations are carried out within the pick’s effective angle range of 50º to 90º. The influence of penetration angle on the rock breaking performance of pick is studied, and the influence of penetration angle on the geometric arrangement of pick is discussed. The geometric arrangement principle of the pick of the tooth arrangement system is summarized. The results show that when the penetration angle decreases from 90º to 50º, the rock mass changes from tension and tension-shear fracture to shear and tension-shear fracture, the average penetration force and crushing degree of pick increase, and the leaping invasion characteristic of pick decreases significantly. Type I picks with penetration angles of 75º?90ºand type III picks with penetration angles of less than 55º play an auxiliary role in rock breaking, while type II picks with penetration angles of 55º to 75º can produce a wide range of horizontal non-penetrating cracks in the rock mass and play a major role in the process of breaking rock mass in the tooth arrangement system. Two type II picks have successively penetrated into the rock mass between the better broken sections of the rock mass, two type II picks forming the mechanical model of the basic rock breaking unit, and several basic rock breaking units are arranged according to the sinusoidal form, thus forming a design method of tooth arrangement system. The research results provide a theoretical basis for perfecting the design method of the tooth arrangement system of the double-wheel trench cutter and breaking the technical barriers in the design method of the tooth arrangement system of the double-wheel trench cutter abroad.