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目前地下采矿和地质工程中,有不少情况要求测定地孔间距。在深孔法掘进盲天井中需要测定各孔孔底间距,要求测距相对误差小于15～20％,以检查凿岩的各种防偏措施效果和调整各炮孔的起爆顺序。1977年曾用感光测斜仪进行了测定,其误差计算见图1。图1中S_1为两孔测算的距离,S_2为它们实际孔底间距(300毫米),测定误差ΔS_i为:ΔS_1=S_1-S_2=h·(tgβ_1-tgβ_2)(1)取施工中极限情况:tgβ_2=0.03,取测斜仪最小误差为30′,代入(1)式,求出
Currently underground mining and geological engineering, there are many situations require determination of the hole spacing. In the deep-hole method of driving blind pavements need to measure the hole bottom spacing, ranging error required less than 15 ~ 20%, in order to check the rock drill various anti-offset measures the effect and adjust the blasting sequence of each hole. 1977 was measured with a photosensitive inclinometer, the error calculation shown in Figure 1. S_1 is the distance between the two holes in Fig. 1, and S_2 is the actual distance between holes (300 mm). The measurement error ΔS_i is: ΔS_1 = S_1-S_2 = h · (tgβ_1-tgβ_2) (1) tgβ_2 = 0.03, take the minimum error of inclinometer was 30 ’, substituted into (1), find