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地铁盾构隧道井下双导线测量控制 被引量:4
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作者 王西林 《工程技术研究》 2019年第3期241-242,共2页
本文通过实例主要研究并提出了一种隧道双导线测量技术方案,使隧道控制测量既具有常规的支导线简单快捷优点,又具有常规双导线多余观测形成闭合条件的特点,适应现场复杂的测量环境,突破多因素对选点埋桩、测量、精度的限制,在不显著影... 本文通过实例主要研究并提出了一种隧道双导线测量技术方案,使隧道控制测量既具有常规的支导线简单快捷优点,又具有常规双导线多余观测形成闭合条件的特点,适应现场复杂的测量环境,突破多因素对选点埋桩、测量、精度的限制,在不显著影响费用的同时提高了测量作业效率,保证控制测量的可靠性,非常适合贯通距离较长的隧道。 展开更多
关键词 地铁 盾构 隧道井下 双导线测量控制
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地铁井下隧道双导线测量控制 被引量:2
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作者 曾保金 朱剑峰 +1 位作者 丁世武 赵兴强 《云南水力发电》 2019年第6期92-94,共3页
以实际例子为研究,提出一种隧道双导线测量技术方案。这种方案兼具常规支导线简单快捷,又具备多余观察闭合条件的特点。目前双导线测量控制系统在实际施工中得到广泛的应用,它能够保证测量控制的可靠性,在地铁隧道控制网中起到很重要的... 以实际例子为研究,提出一种隧道双导线测量技术方案。这种方案兼具常规支导线简单快捷,又具备多余观察闭合条件的特点。目前双导线测量控制系统在实际施工中得到广泛的应用,它能够保证测量控制的可靠性,在地铁隧道控制网中起到很重要的作用。 展开更多
关键词 地铁 盾构 隧道井下 双导线测量控制
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一种深井隧道通信系统
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作者 陈会 陈桂森 《电子世界》 2004年第3期56-57,共2页
本文介绍一种借助井下隧道铺设的泄漏感应传输线进行无线电通信的收发系统,它可以广泛应用于井下联络和急救,具有很好的社会价值和市场前景。
关键词 无线电通信 井下隧道 泄漏感应传输线 单频半双工 电路原理 矿井 井下通信
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Experiment on mechanical properties of steel fiber reinforced concrete and application in deep underground engineering 被引量:6
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作者 WANG Qi-sheng LI Xi-bing +2 位作者 ZhAO Guo-yan SHAO Peng YAO Jin-rui 《Journal of China University of Mining and Technology》 EI 2008年第1期64-66,81,共4页
Specimens of steel fiber reinforced concrete (SFRC) in volume ratios of 0%, 0.5%, 1% and 1.5% were prepared to study the supporting effect of SFRC at these diffterent volume ratios in a deep soft rock tunnel. Experi... Specimens of steel fiber reinforced concrete (SFRC) in volume ratios of 0%, 0.5%, 1% and 1.5% were prepared to study the supporting effect of SFRC at these diffterent volume ratios in a deep soft rock tunnel. Experiments with mechanical properties of compressive strength in cubic specimens, cleave strength in cylindrical specimens and four-point flexure strength of sheet metal specimens were carded out. The experimental results indicate that SFRC in a volume ratio of 1% is superior in ranking to other volume ratios in terms of technique and economics. By means of a numerical simulation, given the characteristics of soft rock deformation and damage at great depth, a new support substitution scheme of SFRC to replace plain concrete is proposed. The results of an industrial trial show that the support provided by SFRC can withstand large deformations of the surrounding rock. Good resuits have been obtained in a practical anplication. 展开更多
关键词 volume ratio steel fiber concrete mechanical performance EXPERIMENT great depth soft rock tunnel
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Use of fuzzy set theory for minimizing overbreak in underground blasting operations——A case study of Alborz Tunnel,Iran 被引量:4
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作者 Mohammadi Mohammad Hossaini Mohammad Farouq +1 位作者 Mirzapour Bahman Hajiantilaki Nabiollah 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第3期439-445,共7页
In order to increase the safety of working environment and decrease the unwanted costs related to overbreak in tunnel excavation projects, it is necessary to minimize overbreak percentage. Thus, based on regression an... In order to increase the safety of working environment and decrease the unwanted costs related to overbreak in tunnel excavation projects, it is necessary to minimize overbreak percentage. Thus, based on regression analysis and fuzzy inference system, this paper tries to develop predictive models to estimate overbreak caused by blasting at the Alborz Tunnel. To develop the models, 202 datasets were utilized, out of which 182 were used for constructing the models. To validate and compare the obtained results,determination coefficient(R2) and root mean square error(RMSE) indexes were chosen. For the fuzzy model, R2 and RMSE are equal to 0.96 and 0.55 respectively, whereas for regression model, they are 0.41 and 1.75 respectively, proving that the fuzzy predictor performs, significantly, better than the statistical method. Using the developed fuzzy model, the percentage of overbreak was minimized in the Alborz Tunnel. 展开更多
关键词 Fuzzy model Overbreak Regression analysis Underground blasting Alborz Tunnel
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Analytical and numerical modeling for the effects of thermal insulation in underground tunnels 被引量:2
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作者 Liu W.V. Apel D.B. +1 位作者 Bindiganavile V.S. Szymanski J.K. 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第2期267-276,共10页
The heat How generated from the infinite rock mass surrounding the underground tunnels is a major cause for the increasing cooling demands in deep mine tunnels.Insulation layers with lower thermal conductivities on tu... The heat How generated from the infinite rock mass surrounding the underground tunnels is a major cause for the increasing cooling demands in deep mine tunnels.Insulation layers with lower thermal conductivities on tunnel walls and roof ceilings are believed to supply a thermo-barrier for heat abatement.However,it is found that no systematic theoretical investigations were made to predict and confirm the effectiveness of underground thermal insulation.Specifically,investigations on the underground insulation problems involving heat flows through the semi-infinite hot rock mass and insulation layer were not sufficient.Thus,in this paper,the thermal characteristics,accompanied with heat flow through the semi-infinite rock mass and the insulation layer,were modeled by both analytical and numerical methods with focus on underground mine tunnels.The close agreements between models have indicated that the thermal insulation applied on tunnel surfaces is able to provide promising heat abatement effects. 展开更多
关键词 Thermal insulation Theoretical models Underground Rock mass Heat abatement
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