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针对钻孔摄像技术对结构面产状测量只限于垂直孔的现状,以钻孔孔口圆心为原点,建立空间左手直角坐标系,对倾斜孔中结构面产状的确定方法进行了详尽的阐述和推导,得出了精确的解析计算公式,并基于C#语言进行编程,开发了IDOIB软件,通过测试表明此方法及其程序的正确性.采用PVC管模拟钻孔孔壁,进行钻孔摄像技术用于结构面产状测量的可靠性试验研究,结果表明:(1)对于垂直孔,测量结果的倾向绝对误差为[-3°,4°]、倾角绝对误差为[-1.5°,1.0°],说明该技术用于垂直孔进行结构面产状测量是可靠的,能满足工程应用精度.(2)当PVC管的倾伏向为270°、倾伏角为25°时,结构面产状可靠度为0.10;倾伏向为176°、倾伏角为60°时,结构面产状可靠度为0.67.PVC管倾伏角的不同导致结构面产状可靠度的差异.(3)一般岩体工程的结构面产状测量结果应具有高等级可靠度(不小于0.8),即须在倾伏角不小于71°的钻孔内采用该技术进行测量.
Aiming at the current situation that the boring camera technology is only limited to the vertical hole in the measurement of the output of the structure surface, the center of the hole is taken as the origin, the space left-handed rectangular coordinate system is established, and the method of determining the structure surface in the inclined hole is elaborated And deduced, the exact analytical formula was obtained and programmed based on C # language, IDOIB software was developed, and the correctness of this method and its program was demonstrated.Through the use of PVC pipe to simulate the borehole wall, borehole imaging technology The results show that: (1) For vertical holes, the absolute error of the measured results is [-3 °, 4 °] and the absolute tilt error is [-1.5 °, 1.0 ° ], Which shows that the technology is reliable for the vertical hole to make the measurement of the structure surface, and can meet the engineering application accuracy. (2) When the PVC tube has a dip of 270 ° and a dip angle of 25 °, The reliability is 0.10, the dip direction is 176 °, the dip angle is 60 °, the yield reliability of the structural plane is 0.67.The difference of the dip angle of the PVC pipe results in the difference of the yield reliability of the structural plane. (3) The structural surface of the engineering output measurement results should have a high level of reliability (not less than 0.8) This technology shall be used in the rake angle of not less than 71 ° measured in the borehole.