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针对钻孔局部壁面应力全解除法地应力测量时,需要在钻孔侧壁上钻切出直径为30mm、长度不小于40mm的微型“悬臂梁”状圆柱形岩样的要求,设计了一套钻切微型圆柱状岩样的室内试验平台。分别以单位时间的钻进深度、钻压、钻头转速作为钻进控制模式,研究了在红砂岩、大理岩、花岗岩3种长方体岩块上钻切微型圆柱状岩样的钻进效果,结果表明,以钻头转速作为钻进控制模式比较理想。定量给出了用于钻孔局部壁面应力全解除岩样切割钻进时的钻头转速、钻压、以及马达功率参数的建议选用范围,从而为开发基于钻孔局部壁面应力解除法的侧壁岩样切割工具提供了参考。
In order to measure the stress of the stress relief method of partial wall surface stress in borehole, the requirement of miniature “cantilever” cylindrical rock specimen with diameter of 30mm and length of 40mm should be drilled on the side wall of the borehole. A set of drill-cut micro-cylindrical rock-like indoor test platform. The drilling depth per unit time, weight-on-bit and bit rotation speed are taken as the drilling control mode respectively. The drilling effect of micro-cylindrical rock samples drilled on three kinds of rectangular block of red sandstone, marble and granite was studied. , To drill speed as drilling control mode is ideal. This paper gives quantitatively the suggested range of drill bit rotation speed, bit weight and motor power parameters at the time of partial wall surface stress relief of rock drilling, so as to develop the sidewall rock sample based on the partial wall surface stress relief method of borehole Cutting tools provide a reference.