三软煤层沿空巷道破坏机制及锚注控制

针对龙口矿区梁家煤矿典型三软地层沿空巷道-4606材料巷围岩控制难题,通过现场监测和试验,分析原支护方案下围岩变形破坏机制。煤层结构复杂,围岩易膨胀、软化,围岩破坏范围大,拱架变形破坏严重,锚杆支护潜力无法有效发挥是巷道变形破坏的主要原因。以锚注支护为核心,实施了U型棚＋注浆锚杆＋注浆锚索和注浆锚杆＋注浆锚索2种联合支护对比试验方案。结果表明：方案实施后,巷道围岩变形量均小于原支护方案37%以上,U型棚＋注浆锚杆＋注浆锚索联合支护方案中U型棚对围岩的控制作用不明显,注浆锚杆＋注浆锚索联合支护完全可以取代传统的U型棚支护。...

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Bibliographic Details
Published in煤炭学报 no. 5; pp. 1111 - 1119
Main Author 王琦 潘锐 李术才 何满潮 任尧喜 王雷 丁国利 孙会彬 江贝
Format Journal Article
LanguageChinese
Published 2016
Subjects
三软煤层
沿空巷道
破坏机制
锚注试验
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Summary:针对龙口矿区梁家煤矿典型三软地层沿空巷道-4606材料巷围岩控制难题,通过现场监测和试验,分析原支护方案下围岩变形破坏机制。煤层结构复杂,围岩易膨胀、软化,围岩破坏范围大,拱架变形破坏严重,锚杆支护潜力无法有效发挥是巷道变形破坏的主要原因。以锚注支护为核心,实施了U型棚＋注浆锚杆＋注浆锚索和注浆锚杆＋注浆锚索2种联合支护对比试验方案。结果表明：方案实施后,巷道围岩变形量均小于原支护方案37%以上,U型棚＋注浆锚杆＋注浆锚索联合支护方案中U型棚对围岩的控制作用不明显,注浆锚杆＋注浆锚索联合支护完全可以取代传统的U型棚支护。
Bibliography:three soft coal seam; gob side entry; failure mechanism; bolt-grouting test
11-2190/TD
According to the field investigation and experiments on a typical gob side entry-material roadway of workingface 4606 in Liangjia Coal Mine,the failure mechanism of surrounding rock under original supporting plan was ana-lyzed. The complex structure of coal seam,the easy expansion and softening of surrounding rock,large destructionscope,serious arch deformation,and ineffective support were the main causes of roadway failure. Taken bolt-groutingsupport as a core measure,two supporting test schemes,namely U type shed＋grouting bolt＋grouting cable and groutingbolt＋grouting cable,were proposed. The results show that the surrounding rock deformations are less than 37% com-pared with original supporting plan. U type shed does not play an obvious role in controlling surrounding rock,there-fore,the grouting bolt ＋ grouting cable can replace U-type shed.
WANG Qi, PAN Rui , LI Shu-cai , HE Man-chao, REN Yao-xi, WANG Lei , DING Guo-li ,SU
ISSN:0253-9993