摘要：To research the anchoring effect of large deformation bolt,tensile and drawing models are ***,the evolution laws of drawing force,bolt axial force and interfacial shear stress are ***,the influence of structure element position on the anchoring effect of large deformation bolt is *** last,the energy-absorbing support mechanism is *** show that during the drawing process of normal bolt,drawing force,bolt axial force and interfacial shear stress all gradually increase as increasing the drawing displacement,but when the large deformation bolt enters the structural deformation stage,these three values will keep stable;when the structure element of large deformation bolt approaches the drawing end,the fluctuation range of drawing force decreases,the distributions of bolt axial force and interfacial shear stress of anchorage section are steady and the increasing rate of interfacial shear stress decreases,which are advantageous for keeping the stress stability of the anchorage *** the working process of large deformation bolt,the strain of bolt body is small,the working resistance is stable and the distributions of bolt axial force and interfacial shear stress are *** a rock burst event occurs,the bolt and bonding interface cannot easily break,which weakens the dynamic disaster degree.

摘要：Roof pre-splitting is an effective method to control the roof with potential rock burst *** this study,three-point bending tests were carried out by using fine sandstone specimens with different pre-cracked lengths as test objects,and digital speckle correlation method(DSCM)and acoustic emission(AE)technology were used to track the entire process of crack *** effect of pre-cracks on the fracture of rock beams was evaluated,and the mechanical mechanism of the rock beam fracture process was *** rock beam pre-splitting design method was developed,and the application effect of the method was proved by the microseismic monitoring data obtained from the 10303 working face of Jining No.2 coal mine in *** results show that the loading time history curve of pre-cracked beams exhibits obvious residual *** with the intact rock beam,the tensile strength,and maximum tensile strain of 35 mm pre-cracked rock beam are decreased by 32.4% and 33.1%,respectively and the acoustic emission b value is increased by 30.2%.According to the pre-splitting design method of rock beam,the maximum and average microseismic energy of the 10303 working face after pre-splitting construction are reduced by 25.6% and 6.4%,respectively,with excellent prevention and control effect of thick roof.

摘要：对大松动圈围岩巷道,单一锚杆支护难以实现对整个破裂区围岩的锚固控制,采用锚网索联合支护时,应考虑锚杆支护对联合支护设计的作用。通过分析大松动圈围岩锚杆锚固支护机制,提出量化锚杆支护作用的锚固承载系数,形成锚网索联合支护参数量化计算方法。研究结果表明：锚杆锚固支护后将大松动圈围岩分为浅层锚固区和深层破裂区,浅层锚固区具有一定承载能力,可视作锚索的等效托盘;在锚网索联合支护中,浅层锚固区承载结构稳定的条件是锚固结构承载力大于环向轴力且能够有效控制破裂区围岩;锚固承载系数大小主要取决于浅层锚固区与破裂区和锚杆预紧力与设计锚固力的关系,对于大松动圈围岩其取值范围为0.45~0.75。经现场试验可知,巷道顶底板移近量为273 mm,两帮移近量为393 mm,表面位移曲线趋于平稳,采用该方法得到的锚网索支护参数有效保证了巷道的正常使用。

摘要：针对DS18B20采集精度高但读取温度速度慢的特点,本文设计开发了一套层次化多点数字化测温系统,该系统是一个PC机为主控机,由多个单片机和多个数字温度传感器DS18B20构成温度检测系统。系统分为三层,每一层都采用了模块化设计,便于系统的扩展。本文给出了系统的总体结构框图及底模块单元电路图。软件部分给出了数据转发控制流程图。该系统结构简单,温度控制准确,测量精度高和实时性强,具有很高的实际应用价值。

摘要：以陕北地区某矿主井冻结工程为参照原型,将相似理论和模型试验的研究方法应用于饱和砂层冻结壁解冻过程,进而探求解冻过程中的井筒致灾因素,为饱和砂层冻结施工和解冻阶段施工工艺改进提供试验依据。

摘要：潜孔钻机通过冲击力、轴力和扭矩共同作用进行凿岩,其钻孔效率严重依赖于各工作参数的选择。因此,本文利用自主研发的潜孔钻机随钻测量系统,通过采集钻孔过程中的随钻参数,分析了推进力、扭矩、风压、冲击频率等8个工作参数对冲击钻孔效率的影响。基于潜孔钻机的凿岩特性,设计了正交试验并进行了现场钻孔测试,揭示了主要影响钻孔效率的随钻参数分别为风压、冲击频率和轴力。此外,笔者发现,在不同风压条件下,轴力与钻进速度之间存在最佳匹配值;而在不同轴力水平下,风压与碎岩比功之间存在反比例关系。基于钻速和碎岩比功这两个评价指标,确定了轴力为10.5 kN、风压为1.75 MPa、冲击频率为26 Hz时的最优钻孔参数组合。研究结果可为潜孔钻机钻孔工艺的优化、提高生产效率及降低生产成本提供理论参考。

摘要：介绍了智能服装的国内外研究现状,对目前开发的智能服装种类及开发实施方法进行了归纳总结,阐述了目前智能服装研发过程存在的问题及解决方案。

摘要：针对深井超深井以及水平井等高难度井井筒内普遍存在砂桥、岩屑床等导致的套管难以下放到位的问题,研制了一款以涡轮为动力元件的旋转引鞋套管下放工具。通过建立涡轮定、转子的三维模型,利用ANSYS仿真软件对其进行流道抽取、仿真分析和水力性能预测,并搭建了10级涡轮试验台架进行水力性能试验。试验结果表明:试验数据与仿真数据相符;涡轮最佳转速区间为600~1000 r/min,扭矩120~180 N·m,压降稳定在1.6 MPa左右;在工作转速100~200 r/min时,涡轮扭矩为245~290 N·m,满足250 N·m的最大扭矩需求。所得结论可为旋转引鞋套管下放工具的设计和优化提供技术支持。

摘要：为探究光伏区异质环境对新疆伊犁哈萨克自治州荒漠草地土壤理化特性影响,根据光伏板空间布局将取样位置划分为光伏板间、光伏板前檐、光伏板下方、光伏板后檐以及光伏板外(对照组)5种处理,并对其不同土层的土壤理化特性及土壤化学计量特征进行分析研究。结果表明:光伏板处理区土壤含水量显著增加,其中10~30 cm土层土壤含水量平均增加62.35%;总体上,pH值、电导率和全氮无显著性差异,其中光伏板处理区的0~30 cm土层土壤pH值范围在8.51~8.75,电导率范围在364.40~538.07μS·cm^(-1),全氮范围在1.58~2.03 g·kg^(-1);除20~30 cm土层前檐N∶P显著低于对照,其余各土层C∶N,C∶P和N∶P无显著性差异;光伏板处理区部分取样位置土壤化学计量特征高于对照;相关性分析表明C∶N和SOC,C∶P和SOC,C∶P和C∶N,N∶P和TN,N∶P和C∶P存在极显著正相关性(P<0.01)。综上,光伏区异质环境能够改善该地区荒漠草地土壤理化特性,为今后草地植被的恢复和后续草种补播提供了有利参考依据。

摘要：滦平抽水蓄能电站装机容量1 200 MW,装设4台300 MW抽水蓄能机组,工程主要任务是承担京津唐电网调峰、填谷、储能、调频、调相、紧急事故备用等,并促进矿区生态修复。文章对该电站可行性研究阶段水泵水轮机主要参数的优化选择及关键技术研究进行了介绍。