摘要：Strainburst is one type of rockburst that generally occurs in deep *** this study,the strainburst behaviors of marble specimens were investigated under tunnel-excavation-induced stress condition,and two stress paths were designed,a commonly used stress path in true triaxial unloading rockburst tests and a new test path in which the intermediate principal stress was *** the tests,a high-speed camera was used to record the strainburst process,and an acoustic emission(AE)monitoring system was used to monitor the AE characteristics of *** these two stress paths,all the marble specimens exhibited strainbursts;however,when the intermediate principal stress was varied,the rockburst became more *** obtained results indicate that the intermediate principal stress has a significant effect on rockburst behavior of *** a higher intermediate principal stress before the unloading,more elastic strain energy was accumulated in the specimen,and the cumulative AE energy was higher in the rockburst-induced failure,i.e.,more elastic strain energy was released during the ***,more violent failure was observed:more rock fragments with a higher mass and larger size were ejected outward.

摘要：巷道开挖后,巷道周边岩体将由于应力集中产生破坏变形,形成松动圈。围岩松动圈的大小直接决定巷道围岩变形控制的难易程度。探地雷达是目前矿山最常用的物探手段之一,基于探地雷达松动圈探测机理分析,对轨道运输巷道不同断面位置进行了围岩松动圈探测,巷道围岩松动圈范围在1.1～1.6m之间。分析测试结果得出轨道运输巷道围岩松动圈的分布规律,并对巷道的支护方案进行优化设计。

摘要：随着煤矿开采深度的增加,深井软岩巷道围岩变形控制变得异常困难,破坏后巷道的修复问题日趋严重。针对阳城煤矿南翼软岩大巷严重变形破坏控制难题,通过现场调研和钻孔电视探测分析,揭示了巷道围岩的破坏特征,基于锚注支护原理,提出了"全断面高强预应力锚杆主动支护+全断面注浆管和长注浆锚索注浆加固+底板超挖锚注回填控制底鼓"的修复加固方案,并设计了合理的支护参数及工艺。现场应用观测结果表明:该修复方案能较好的控制围岩变形,保证巷道长期稳定,具有在类似破坏巷道修复工程中推广应用的价值。

摘要：针对工程设计中存在众多的不确定变量,且无法都采用概率理论描述其分布规律的问题,文中提出一种新的可靠性优化设计方法,该方法采用混合理论来描述不确定变量的分布特性,并基于JC法求可靠性指标。数值算例和工程算例表明,该方法求解效率较常规可靠性优化设计方法高,并且计算结果更加准确。

摘要：文章介绍锆合金开发与研究的现状,着重概述我国高性能锆合金的发展。我国在跟踪国际锆合金发展的同时,通过对改善锆4合金耐腐蚀性能的研究,研制出了具有工艺代表性的改进型锆4合金包壳材料,且开发了两种新型锆合金。新型锆合金的堆外性能研究结果表明,它们的抗疖状腐蚀和抗吸氢性能优于锆4合金,其他性能好于或与锆4合金相当,综合性能明显优于锆4合金。

摘要：以设施温室环境为研究对象,基于设施温室蔬菜对环境条件的不同需求,设计搭建物联网农业综合服务平台。通过传感器、摄像头感知设施温室内空气温度、空气湿度、土壤温度、土壤湿度、二氧化碳浓度和光照强度等环境因素以及生产实时画面,实现对设施温室环境的有效监测、监控。研究设施温室的病虫害测报防控系统能够和温室设备远程自动化控制,实现对设施温室环境的自动调节,有效减少病虫害对生产作业的有害影响,搭建农业综合服务平台,提高对设施温室环境的感知与病虫害的预警和综合诊断能力,为农业生产管理提供更为便捷的应用服务。农业综合服务平台可实现电脑PC端、手机客户端2种方式登录,使平台的应用更加广泛与便捷。