【非垂直孔长螺旋钻进技术的试验研究】代国忠.pdf
TheTeststudyofLong-augering Technique with Non-straight Hole(Absiract) Postgraduate Dai Guo-zhong Teacher Zheng Pei-gen Professor In the paper long-augeriug with non-straight hole(it i6 stressed to driii anchor hole of earthformations)have been studied by test,on the basis of the applications of l
5.Changingof drill hoie dipangleis connected with itself drillweight as well rock cutting stackingupthe lower part of thc augcr holc.As6<15°,drill hole dip angleincrease(0-0°)/m,6takethepiaceof dipangle.Oo the contrary 0>20°,drillholedipangle decrease(0°-0°)/m 6.
3、斜孔长螺旋钻进两个具有代表性及广泛适用性的钻进总功率 经验公式为:Ry²sinaRcosY N=2x0P0-0a.- 0sin(aR+Y)N=0x+0Po+0n-0θ+Ry²+0-15 4、对错固钻孔的钻具承受的最大扭矩及应力进行了计算。如钻 进30m深的土层锚杆钻孔,钻具承受的最大扭短为2424N.m,钻杆最大 应力是218MPa.5、影响钻孔倾角:日)的变化主要有螺旋钻具自身重量及土屑在 钻孔下部堆积两个因素。当螺旋钻孔倾角0<15°时,钻孔轴线趋于 下垂,下垂量为(0°-0.[wshop_paid show_buy_btn="true"]