Nanyangpo Mine of Shanyin Jinhaiyang
School of Energy and Mining Engineering, China University of Mining & Technology-Beijing

以山阴金海洋南阳坡煤矿特厚煤层短壁综放工作面为研究对象，针对跨度达8.7 m的综放大断面切眼支护设计，既要满足有效控制切眼巷道围岩变形，又要尽可能减少支护材料浪费和支护成本偏高的问题，利用数值模拟软件FLAC3D研究了不同支护方案下顶板预应力场分布特征，确定了大跨度切眼的支护形式为锚杆、金属菱形网、锚索+W钢带以及单体支柱等的联合支护形式，通过校核支护参数，支护设计均能够满足要求，最后对围岩变形量进行了现场观测，浅部、深部基点离层值分别为9 mm、12 mm，巷道顶板下沉量约为140 mm，煤壁侧巷道变形量约为105 mm，老塘侧巷道变形量约为98 mm，围岩变形量小，说明大断面切眼巷道得到了有效控制，能够满足安全生产使用要求，为其他类似工程条件的大断面切眼支护问题提供了借鉴。

Taking the short-wall fully-mechanized caving face of extra-thick coal seam in Nanyangpo Mine of Shanyin Jinyang as the research object, aiming at the support design of fully-mechanized enlarged section cut with a span of 8.7 m, it is necessary to meet the requirements of effective control of surrounding rock deformation of cut roadway, and to minimize the waste of support materials and the high cost of support. The numerical simulation software FLAC3D was used to study the distribution characteristics of roof prestress field under different support schemes, and the support form of large-span cut was determined as the combined support form of bolt, metal diamond net, anchor cable + W steel belt and single pillar. By checking the support parameters, the support design can meet the requirements. Finally, the deformation of surrounding rock was observed on site. The separation values of shallow and deep base points were 9 mm and 12 mm respectively. The subsidence of roadway roof was about 140 mm. The deformation of roadway on coal wall side was about 105 mm. The deformation of roadway on old pond side was about 98 mm, and the deformation of surrounding rock was small. It showed that the large section open-off cut roadway had been effectively controlled, which could meet the requirements of safe production and use, and provided a reference for the support of large section open-off cut under other similar engineering conditions.

王志根1，汪国安2，本亚敏·哈里克2. 特厚煤层短壁综放大断面切眼巷道围岩控制研究[J]. 煤炭与化工, 2024, 47(2): 14-19.

Wang Zhigen1, Wang guoan2, Benyamin·halike2. Study on surrounding rock control of large cross- section open-off cut in short-wall fully mechanized top- coal caving of extra-thick coal seam. CCI, 2024, 47(2): 14-19.