砌块充填沿空留巷底鼓大变形控制技术研究 |
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引用本文: | 孔庆军. 砌块充填沿空留巷底鼓大变形控制技术研究[J]. 煤炭工程, 2020, 52(10): 34-38. DOI: 10.11799/ce202010008 |
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作者姓名: | 孔庆军 |
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作者单位: | 兖矿贵州能化有限公司 |
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摘 要: | 针对传统砌墙沿空留巷矿压显现剧烈,巷道出现明显顶板下沉、底鼓、两帮挤出、墙体破损,巷道返修率高严重影响巷道的正常使用的问题,通过理论分析、数值模拟及矿压监测等研究方法对砌块充填沿空留巷条件下底鼓大变形控制技术进行了研究。提出了“顶板预裂爆破卸压技术+ 顶板关键部位加强支护技术+砌块上方柔性让压支护技术+砌块墙体双控锚杆支护技术”底鼓大变形综合控制技术体系。通过上述技术实施,切断了顶板的应力传递降低了顶板的压力,改善了围岩应力条件,提高了巷道顶板及墙体的稳定性,实现了让压支护。通过现场监测表明,底鼓大变形综合控制技术巷道锚索应力值降低34%,底鼓变形量降低77%,巷道高度和宽度满足安全生产需求。研究成果对其他类似地质条件下砌块充填留巷底鼓大变形控制具有一定的参考意义。
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关 键 词: | 砌块充填 沿空留巷 底鼓大变形 切顶卸压 围岩应力 |
收稿时间: | 2020-07-21 |
修稿时间: | 2020-08-24 |
Study on Control Technologies of Floor Heave in Gob Side Entry Retaining with Block Filling |
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Abstract: | In view of the severe ground pressure in the traditional wall-built gob-side entry retaining, such as obvious roof subsidence, floor heave, extrusion of two sides and wall damage, and the high repair rate seriously affects the normal use of the roadway, this paper studies the large deformation control technology of floor heave under the condition of block filling gob-side entry retaining by theoretical analysis, numerical simulation and ground pressure monitoring. A comprehensive control system for large deformation of floor heave is put forward, which includes "roof presplitting blasting pressure relief technology"+"strengthening support technology for key parts of roof"+"flexible yielding support technology above block"+"double control bolt support technology for block wall". Through the implementation of the above technology, the stress transmission of roof is cut off, the pressure of roof is reduced, the stress condition of surrounding rock is improved, the stability of roadway roof and wall is improved, and yielding support is realized. The field monitoring shows that the stress value of anchor cable and deformation of floor heave are reduced by 34% and 77% respectively, and the height and width of roadway meet the requirements of safe production. The research results have certain reference significance for controlling large deformation of floor heave in block filling roadway under other similar geological conditions. |
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