|
|
|
| Design of large spacing anchor rod support in thick and hard roof roadway |
| Li Yaohui |
| Jincheng Company Qiyi Mine, Jinneng Holding Group Co., Ltd., Jincheng 048406, China |
|
|
|
|
Abstract Aiming at the supporting conditions of thick and hard roof of No.15 coal seam roadway in Qiyi Mine, the physical and mechanical parameters of surrounding rock of No.15 coal seam roadway were obtained by means of theoretical analysis, laboratory test, engineering analogy and numerical simulation. It was determined that the loose range was about 0.65 ~ 0.8 m, which belonged to the small loose circle. The RMR scores of K2 limestone, mudstone and bauxite mudstone in the surrounding rock of the roadway were calculated to be 51,45 and 47 respectively, which belonged to the better rock mass of grade III, which provided a certain basis for the selection of bolt length and strength. By analyzing the axial force, deviatoric stress, maximum principal stress and plastic zone distribution of bolt and anchor cable under four support schemes, the design of large spacing bolt support was put forward. It was considered that the bolt spacing of No.15 coal seam roadway was 1.2 m and the anchor cable spacing was 2.4 ~ 3.6 m, which can meet the support requirements. The research results provide some reference for the stability control of roadway surrounding rock under similar conditions.
|
|
|
|
|
|
| [ 1 ] 康红普，王金华，林 健. 煤矿巷道支护技术的研究与应用[ J ]. 煤炭学报，2010，35（ 11 ）：1 809 - 1 814.
[ 2 ] 刘德军，左建平，刘海雁，等. 我国煤矿巷道支护理论及技术的现状与发展趋势[ J ]. 矿业科学学报，2020，5（ 1 ）：22 - 33.
[ 3 ] 刘跃东，林 健，杨建威，等. 基于掘锚一体化特厚顶煤巷道快速掘进与支护技术[ J ]. 煤炭科学技术，2017，45（ 10 ）：60 - 65.
[ 4 ] 李胜伟. 厚层坚硬直接顶巷道大排距锚杆支护方案设计[ J ]. 山东煤炭科技，2019（ 7 ）：77 - 78，81.
[ 5 ] 赵晓举，杨战标，张 波，等. 深部破碎围岩高预紧力加长锚固支护技术研究[ J ]. 煤炭技术，2022，41（ 1 ）：8 - 12.
[ 6 ] 张艳军.“撞楔+钢棚+喷浆”联合支护在断层破碎带中应用[ J ]. 山东煤炭科技，2021，39（ 9 ）：17 - 18，21.
[ 7 ] 宫 耀，侯俊领，袁 琳，等. 巷道高预紧力全长锚固锚杆支护关键技术[ J ]. 科学技术创新，2021（ 16 ）：5 - 6.
[ 8 ] 傅伟斌. 不同高径比岩石单轴抗压强度尺寸效应试验研究[ J ]. 资源环境与工程，2019，33（ 2 ）：232 - 234.
[ 9 ] 宋宏伟，郭志宏，周荣章，等. 围岩松动圈巷道支护理论的基本观点[ J ]. 建井技术，1994（ Z1 ）：3 - 9，95. |
|
|
|
