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掘锚一体大锚杆施工工艺在门克庆煤矿的应用 被引量:2
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作者 徐卫卫 姚依林 +1 位作者 张鹏举 张运中 《内蒙古煤炭经济》 2019年第1期31-33,60,共4页
为实现煤巷快速掘进技术和工艺的进一步突破,解决中天合创煤炭分公司对煤巷高效快速掘进的需求,实现提效降本,提高企业竞争力,中天合创门克庆煤矿11-3103工作面带式输送机巷拟采用掘锚机配合大锚杆支护技术支护顶板。掘锚机能够保证对... 为实现煤巷快速掘进技术和工艺的进一步突破,解决中天合创煤炭分公司对煤巷高效快速掘进的需求,实现提效降本,提高企业竞争力,中天合创门克庆煤矿11-3103工作面带式输送机巷拟采用掘锚机配合大锚杆支护技术支护顶板。掘锚机能够保证对顶板的及时支护,安全系数较高。此外,掘锚机自带帮部锚杆机,实现掘、锚同步,能够有效防止帮部片帮发生。大锚杆支护技术是新的支护形式,在充分论证满足顶板支护强度的条件下,扩大了巷道支护间排距,缩短了支护时间,实现掘锚一体配合大锚杆支护技术在门克庆煤矿深井煤巷的成功应用,并实现月总进尺1050m,日最高进尺46. 5m,创造了蒙陕矿区深井掘锚工艺单进新纪录。 展开更多
关键词 掘锚一体化 大锚杆支护 煤巷 快速掘进
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Mechanism and technology study of collaborative support with long and short bolts in large-deformation roadways 被引量:5
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作者 Yu Hui Niu Zhiyong +2 位作者 Kong Linggen Hao Caicheng Cao Peng 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期587-593,共7页
Common short bolts of equal length are widely used to support the roofs of roadways in coal mines.However, they are insufficient to keep the roof stable against large deformations, so docking long bolts with high leve... Common short bolts of equal length are widely used to support the roofs of roadways in coal mines.However, they are insufficient to keep the roof stable against large deformations, so docking long bolts with high levels of elongation that can adapt to large deformations of the surrounding rock have been adopted. This paper proposes a collaborative support method that uses long and short bolts. In this study,the mechanism of docking long bolts and collaborative support was studied. Numerical simulation, similarity simulation, and field testing were used to analyze the distribution law of the displacement, stress,and plastic failure in the surrounding rock under different support schemes. Compared with the equal-length short bolt support, the collaborative support changed the maximum principal stress of the shallow roof from tensile stress to compressive stress, and the minimum principal stress of the roof significantly increased. The stress concentration degree of the anchorage zone clearly increased. The deformation of the roof and the two sides was greatly reduced, and the subsidence shape of the shallow roof changed from serrated to a smooth curve. The roof integrity was enhanced, and the roof moved down as a whole. Plastic failure significantly decreased, and the plastic zone of the roof was within the anchorage range. The similarity simulation results showed that, under the maximum mining stress,the roof collapsed with the equal-length short bolt support but remained stable with the collaborative support. The collaborative support method was successfully applied in the field and clearly improved the stability of the surrounding rock for a large deformation roadway. 展开更多
关键词 Collaborative support with long and shortbolt Docking long bolt Numerical analysis Similarity simulation
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Effect of CO_2 enrichment on the glucosinolate contents under different nitrogen levels in bolting stem of Chinese kale (Brassica alboglabra L.) 被引量:7
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作者 Gui-xiao LA Ping FAN +2 位作者 Yi-bo TENG Ya-juan LI Xian-yong LIN 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2009年第6期454-464,共11页
The effects of CO2 enrichment on the growth and glueosinolate (GS) concentrations in the bolting stem of Chinese kale (Brassica alboglabra L.) treated with three nitrogen (N) concentrations (5, 10, and 20 mmol/... The effects of CO2 enrichment on the growth and glueosinolate (GS) concentrations in the bolting stem of Chinese kale (Brassica alboglabra L.) treated with three nitrogen (N) concentrations (5, 10, and 20 mmol/L) were investigated. Height, stem thickness, and dry weights of the total aerial parts, bolting stems, and roots, as well as the root to shoot ratio, significantly increased as CO2 concentration was elevated from 350 to 800 μl/L at each N concentration. In the edible part of the bolting stem, 11 individual GSs were identified, including 7 aliphatic and 4 indolyl GSs. GS concentration was affected by the elevated CO2 concentration, N concentration, and CO2×N interaction. At 5 and 10 mmol N/L, the concentrations of aliphatic GSs and total GSs significantly increased, whereas those ofindolyl GSs were not affected, by elevated atmospheric CO2. However, at 20 mmol N/L, elevated CO2 had no significant effects on the concentrations of total GSs and total indolyl GSs, but the concentrations of total aliphatic GSs significantly increased. Moreover, the bolting stem carbon (C) content increased, whereas the N and sulfur (S) contents decreased under elevated CO2 concentration in the three N treatments, resulting in changes in the C/N and N/S ratios. Also the C/N ratio is not a reliable predictor of change of GS concentration, while the changes in N and S contents and the N/S ratio at the elevated CO2 concentration may influence the GS concentration in Chinese kale bolting stems. The results demonstrate that high nitrogen supply is beneficial for the growth of Chinese kale, but not for the GS concentration in bolting stems, under elevated CO2 condition. 展开更多
关键词 Carbon dioxide (CO2) Brassica alboglabra Nitrogen (N) Growth Bolting stem Aliphatic glucosinolates Indolyl glucosinolates Carbon/nitrogen ratio (C/N) Nitrogen/sulfur ratio (N/S)
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