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：劲性搅拌桩复合围护结构工程完工后,临时围护结构一般考虑型钢回收。从复合材料层间应力的角度分析了型钢-水泥土接触面内正应力和摩擦剪应力,得到了二者之间的关系,进而对型钢拔出时围护结构侧向变形引起的弯曲变形阻力进行了分析,结果表明:弯曲变形阻力相对静摩擦阻力要小得多,可以忽略。可为正确认识和理解型钢拔出受力机理、优化工程设计等提供参考。

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：随着城市建设的发展,地下空间得到大规模开发利用,带动了基坑工程的迅速发展,SMW工法围护结构作为基坑围护的一种型式,相对于其他的围护型式具有大壁厚、大深度、抗渗性能好、环保等优点,是一种很有经济潜力的新型围护型式。对型钢劲性材料、减摩剂材料、水泥土特性、SMW工法组合结构特性、设计计算方法等研究成果进行了分析总结,在此基础上提出了今后SMW工法的研究热点与方向。

摘要：基于巷道支护中锚杆与顶板的复合作用和损伤机制分析,对锚固顶板稳定性潜力进行研究,实现了对加锚巷道顶板稳定性的定量描述。利用锚固潜力分析与数值模拟对具体巷道稳定性进行了评价,结果与实际吻合较好,该方法对类似巷道稳定性评价与巷道锚杆支护定量设计具有一定的参考价值。

摘要：Due to the good controllability and high energy efficiency in adsorption processes,photoresponsive adsorbents are intriguing for CO2 ***,most reported photoresponsive adsorbents are designed based on weak adsorption sites,regulating CO2 adsorption through structural change or steric *** addition,ultraviolet(UV)light is commonly involved in the regulation of adsorption *** we report for the first time the smart adsorbents for CO2 capture,which makes strong adsorption sites respond to visible(Vis)*** adsorbents were fabricated by introducing primary amine and Dispersed Red 1(DR1,a kind of push-pull azobenzene that responds to Vis light rapidly)units to mesoporous silica,which act as strong adsorption sites and triggers,*** primary amine sites make the adsorbents highly selective in the adsorption of CO2 over *** light irradiation,azobenzene is in the form of trans configuration,which leads to decreased electrostatic potential of primary amines and subsequently,exposure of active sites and liberal adsorption of *** Vis-light irradiation,cis isomers are formed,which results in increased electrostatic potential of primary amines and subsequently shelter of active *** on such strong adsorption sites,the alteration of CO2 adsorption capacity can reach 40%for the adsorbent with and without Vis-light ***,the trans/cis isomerization of DR1 units can be triggered reversibly by Vis *** present smart system endows adsorbents with selective adsorption capacity and avoids the employment of UV light,which is unlikely to be achieved by conventional photoresponsive adsorbents.

摘要：目的:对长毛风毛菊中的苯丙素类化学成分进行分离鉴定。方法:运用硅胶柱色谱、高效液相制备色谱分离纯化,根据波谱数据确定化合物结构。结果:从长毛风毛菊中分离得到7个苯丙素类化合物,分别鉴定为:伞形花内酯(1)、东莨菪内酯(2)、咖啡酸(3)、七叶内酯(4)、茵芋苷(5)、东莨菪苷(6)、绿原酸(7)。结论:其中,化合物3、4、7为首次从该植物中分离得到。

摘要：提出一种工业机器人用谐波减速器的三向振动测试方法,模拟工业机器人工作状态,设计谐波减速器加载装置,对谐波减速器进行三向振动测试。对测得数据进行时域统计、频域分析,用于评价振动性能,分析谐波减速器振动特性,确定振动异常的原因。通过对产品的振动测试与研究,能有效地监测谐波减速器的振动性能,对产品进行质量控制。

摘要：利用西门子公司的PLC模块作为控制核心,对西门子S7-200在远程闸门控制系统中的应用进行了设计。给出了闸门控制系统硬件构成和系统软件编程框图。介绍了ProfiBus的特点及在系统应用中的实现。采用Step7进行了PLC程序的编制,并在控制现场进行了调试。整个系统运行正常,控制效果达到预期目标。

摘要：煤层气多分支水平井能有效增加控制面积，降低表皮因数，其井身结构优化对获得最经济有效的产能至关重要。为此，分析了煤层倾角、储层保护和井身结构对煤层气水平井产能的影响。采用数值模拟的方法，以沁水盆地南部某区块3#煤层为例，对多分支水平井的井身结构参数进行优化。优化结果表明：主支走向对产能影响较大，适宜的方向为垂直主渗透率方向；产能随着主支长度和分支长度的增加而增加，结合经济性和增产效果，主支长度宜控制在900~1300 m之间，分支长度宜控制在250~400 m之间；分支间距和主分支夹角在一定程度上影响产能，分支间距宜控制在200~300 m之间，主支和分支夹角宜控制在36＆#176;~53＆#176;之间。研究结果可为煤层气多分支水平井的井身结构设计提供参考。