Field evaluation of cable bolt supports
Field evaluation of cable bolt supports
复制标题
电缆螺栓支架的现场评估
DOI：
10.1016/0148-9062(93)90132-w
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
T. M. Brady
中科院分区：
文献类型：
--
作者：
J. Goris;L. Martin;T. M. Brady
美国矿业局与霍姆斯特克矿业公司合作，铅，SD，和犹他州大学，湖城UT，进行了现场演示，以评估电缆锚杆支护的行为在三个不同的网站在Homestake矿。本文介绍了位于45- 48 N采场6500和6650水平之间的其中一个现场的演示结果。所研究的区域采用常规和鸟笼式电缆螺栓进行支撑。45 - 48 N STOPE霍姆斯特克矿位于南达科他州的布莱克山的铅镇。铅区的三个主要地层，Poorman，Ellison和Homestake，在年龄上都是前寒武纪。45- 48 N采场位于Homestake地层中，位于6500和6650水平之间。45- 48 N采场的地面控制由双18.3米长的常规和鸟笼式锚索支护和1.5米长的岩石锚杆组成。电缆支撑模式的站点从0号站点的采场南端开始，继续向北至16号站点（图1）。传统的电缆螺栓安装在站点0和8之间的3米中心，鸟笼电缆放置在站点9和16之间的3.4米中心。图2所示为采场的典型横截面，显示了电缆支架的扇形结构。仪器放置在45- 48 N采场周围的仪器由连接到电缆支架的引伸计和应变计组成。伸长计有五个或六个可灌浆的钢筋锚，这取决于孔的深度，并通过位于6500标高平巷孔环处的102 mm量程线性电位计进行电子读数。安装电缆支架应变计，以确定施加在选定电缆上的荷载量。每个量规长0.69 m，使用细（直径0.25 mm）镍铬线，将其缠绕到电缆外股之间的螺旋槽中。
ABSTRACTINTRODUCTIONThe U.S. Bureau of Mines, in cooperation with the Homestake Mining Co., Lead, SD, and the University of Utah, Salt Lake City, UT, conducted a field demonstration to evaluate the behavior of cable bolt supports at three different sites at the Homestake Mine. This paper presents the results of the demonstration at one of these sites which was located between the 6500 and 6650 levels of the 45-48N stope. The area studied was supported with both conventional and birdcage cable bolts.45-48N STOPEThe Homestake Mine is located in the Black Hills of South Dakota in the town of Lead. The three major formations in the Lead area, the Poorman, the Ellison, and the Homestake, are all Precambrian in age. The 45-48N stope is located in the Homestake Formation and lies between the 6500 and 6650 levels.Ground control for the 45-48N stope consisted of double 18.3-m-long conventional and birdcage cable bolt supports and 1.5-m-long rock bolts. Stations for the cable support patterns began at the south end of the stope at station 0 and continued north to station 16 (fig. 1). Conventional cables bolts were installed on 3-m centers between stations 0 and 8 and birdcage cables were placed on 3.4-m centers between stations 9 and 16. A typical cross section of the stope showing the fan-shaped configuration of the cable supports is shown in figure 2.INSTRUMENTSInstruments placed around the 45-48N stope consisted of extensometers and strain gauges attached to cable supports. The extensometers had either five or six groutable rebar anchors, depending on the depth of the hole, and were read electronically with 102-mm range linearpotentiometers located at the collar of the hole in the drift on the 6500 level.The cable support strain gauges were installed to determine the amount of load being placed on selected cables. Each gauge is 0.69 m long and uses a thin (0.25 mm in diameter), nickel- chromium wire that is wound into spiral grooves between the outer strands of the cable.