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| 深厚表土综放面支架载荷时间效应实测研究 |
| Survey on support load time effect in fully mechanized caving face with deep alluvium |
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| DOI： |
| 中文关键词: 支架载荷 时间效应 综放面 深厚表土 |
| 英文关键词: support load time effect fully mechanized caving face deep alluvium |
| 基金项目:国家重点基础研究发展计划（973）项目（2010CB226803）；国家自然科学基金资助项目(51274022，51174016) |
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| 中文摘要: |
| 结合巨野煤田综放面停产期间压架灾害防治问题，通过对停产期间支架工作阻力进行实测，分析深厚表土综放面支架载荷时间效应及产生机制.结果表明：停产期间支架载荷具有明显的时间效应，并经历与来压时类似的“升高-达到峰值-下降”过程.实体侧支架载荷时间效应更为显著，支架后柱载荷时间效应相对均衡，支架载荷达到峰值的时间不同步，但峰值趋于一致.支架后柱工作阻力明显增大是顶板来压的一种前兆，可作为工作面顶板来压超前预报的指标.支架载荷时间效应产生机制在于，厚表土层载荷促使高位岩梁逐步压迫低位岩梁结构块旋转，间接造成顶煤下沉量和支架受力增大.最后，提出了支架载荷时间效应控制对策，并进行了工程应用.实践表明，通过选择停产时机，控制停产时间和利用支架活柱“下缩让压”特性，可有效控制支架载荷时间效应的危害.研究结果对采煤工作面顶板控制设计及安全管理具有重要意义. |
| 英文摘要: |
| According to the prevention of support crushing during downtime of the fully mechanized caving face in Juye coal field, the survey of support working resistance was carried out during downtime, and support load time effect in the fully mechanized caving face with deep alluvium and its production mechanism were analyzed. The results show that: the support load during downtime has obvious time effect, and it experiences the three stages of rising, reaching peak and decreasing, which show the characteristic like roof weighting. The load time effect of supports on the solid side of working face is more obvious than that of supports on the gob side of working face, and the time effect of the front column load is more balanced than that of the back column load. The load reaching its peak of the support is not consistent with that of the other supports, but the peaks of supports are almost equal. The significant increasing of the back column working resistance is a precursor of roof weighting, and can be an index for roof weighting prediction. The production mechanism of support load time effect in the fully mechanized caving face with deep alluvium lies in: structure block of the lower rock beam rotates under the oppression of higher rock beam bearing the load form the alluvium, and it causes the increase of top coal convergence and support load. Furthermore, control measures of the support load time effect were put forward. the disaster of support crushing resulted from support load time effect can be avoided by selecting downtime chance, controlling downtime time and using the characteristic of “descending and unloading” of support pistons. The results can provide a basis for working face roof control design and roof safety control. |
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