梅花井矿232206工作面辅助运输巷条带砌碹支护研究
2021-10-31孟永华李立波史春黄辉黄海鹏
孟永华 李立波 史春 黄辉 黄海鹏



摘 要:目前,梅花井232206辅助运输巷采用锚网索喷支护方式,在地质构造、围岩淋水等因素影响下,存在巷道围岩变形量过大、后续修整维护工作量繁重等问题。为实现围岩有效控制,本研究将条带砌碹支护技术应用到巷道围岩控制中,并通过理论计算方法确定砌碹厚度为200 mm。同时,依据巷道实际地质条件,对锚杆支护段以及砌碹支护段支护参数进行设计。现场应用后,巷道围岩变形量控制在12 mm以内,取得较好的围岩控制效果。
关键词:巷道掘进;支护设计;条带砌碹支护;围岩控制
中图分类号:TD353文献标识码:A文章编号:1003-5168(2021)15-0059-03
Abstract: At present, the auxiliary transportation lane of Meihuajing 232206 uses anchor-net-cable-spray support method, under the influence of factors such as geological structure and surrounding rock, there are problems such as excessive deformation of the surrounding rock of the roadway and heavy follow-up repair and maintenance work. In order to achieve effective control of the surrounding rock, the strip-masonry support technology is applied to the control of the surrounding rock of the roadway, and the thickness of the building-masonry is determined to be 200 mm through theoretical calculation methods in this study. At the same time, according to the actual geological conditions of the roadway, the support parameters of the bolt support section and the masonry support section are designed. After the field application, the deformation of the surrounding rock of the roadway is controlled within 12 mm, and a good control effect of the surrounding rock is achieved.
Keywords: roadway excavation;support design;strip-masonry support;surrounding rock control
232206工作面輔助运输巷设计长度为3 146.7 m,目前正在进行掘进。232206工作面辅助运输巷沿着22煤层底板掘进,22煤层厚度介于3.09~5.05 m,煤层结构简单。232206工作面辅助运输巷南侧存在DF1正断层,巷道顶板有直罗组粗砂岩含水层,岩性以中、粗粒砂岩为主;底板为粗砂岩,泥质胶结、颗粒支撑,富水性较强。巷道现剩余750 m,断面为直墙半圆拱形,掘进断面积为21.33 m2,净断面积为19.79 m2。
1 工程围岩支护现状
现阶段,梅花井232206辅助运输巷采用锚网索喷支护方式,锚杆为[Φ]20 mm×2 500 mm螺纹钢,拱部间排距为1 100 mm×900 mm,巷帮间排距分别为800 mm×1800 mm、600 mm×1800 mm;拱部用[Φ]21.8 mm×6 150 mm锚索,排距为900 mm,全断面铺设金属网。
2 辅助运输巷现有支护分析
采用锚网索喷支护时,梅花井232206工作面辅助运输巷发生巷道形变量大、难支护的现象。结合232206工作面辅助运输巷地质资料及现场掘进情况,下面分析具体原因。
2.1 构造应力影响
232206工作面辅助运输巷南侧有同巷道走向一致的DF1正断层,受断层影响,工作面掘进过程中局部范围内煤岩层裂隙发育明显。……
