桂平航运枢纽大坝闸门监控改造

广西桂平航运枢纽大坝有15个工作闸门，为使大坝闸门的控制融入电厂的监控系统，更好地与电厂监控系统实现资源共享，优化管理和调度，提高闸门监控的可靠性和稳定性，桂平航运枢纽在电厂监控系统改造完成后，充分利用电厂监控系统开放的硬件和软件资源，将大坝闸门控制改造为电厂监控的一个LCU（现地控制单元），实现了大坝闸门远控与电厂监控系统的融合，并经电厂监控系统远动通信自动将水情数据上传广西中心调度所。     

硬岩金属矿山深部开采中的动力学问题

从深部开采环境阐述了金属矿硬岩在高地应力作用下的储能特征,并从深部开采工艺方面分析了随着金属矿山开采深度的不断增加,连续采矿方法已经成为未来深部开采的必然趋势。通过分析,认为处于高应力下的硬岩矿体在承受连续采矿法带来的动力扰动时,可以认为是岩石动静组合的受力问题。在此基础上,利用岩石动静组合加载理论分析了硬岩矿山在深部开采中的几个关键动力学问题,主要包括:硬岩矿山深部开采中的系统扰动和岩爆、深部开采中爆破引发的矿震及巷道失稳现象、深部硬岩开采中的能量释放与有序调控。理论分析和工程实践证明,硬岩金属矿山深部开采中存在的很多动力学问题可以利用岩石动静组合加载理论进行科学论证和分析,这对深部采矿的工程实践有较好的指导意义。     

Numerical analysis of application for induction caving roof

New method for handling roof of the base successive mining is proposed, which is induction caving in the roof. The key is that it is made certain to the station of the space-time in the induction caving roof, as the stress is released with the mining process. And applying the catastrophe theory, the influencing factors of induction caving roof are studied in the emptied areas, such as the mechanical property of the surrounding rock, the area of the gob, the scope and dimension of tensile stress. The results show that the key factor is the area of the gob to the method of the induction caving roof. Then according to the geology and the ore characteristic, the three dimension FEM mechanical model is built in Tongkeng Mine, the laws of the tensile stress are analyzed to the space and the time in the roof with the mining, then it is rational design to the mine step and time of the handing the roof. Foundation item: Project(50490274) supported by the National Nature Science Foundation of China     

木片浸渍程度数学模型的应用

采用木片浸渍程度数学模型对木片厚度、预汽蒸和添加表面活性剂等对木片浸渍程度的影响进行评价.结果表明,木片浸渍程度数学模型可用以评价各因素对木片浸渍程度的影响,是评价木片浸渍程度的一个有效工具.     

定向井抽油杆柱应力分析及加重杆的应用

长庆油田目前的定向井井数达到了总井数的85％以上。由于定向井井眼轨迹的特殊性,抽油杆在油井内的受力情况比较复杂,很容易出现断脱问题,严重影响了油井正常生产。分析了定向井抽油杆柱的弯曲应力及其影响;进行了加重杆的优化设计。抽油杆柱下部配加重杆的方法经现场应用后取得了较好的效果,延长了油井免修期,目前已全面推广应用。     

基于第二类切比雪夫多项式的岩土参数概率分布推断

基于数值分析中的逼近原理,提出了描述岩土参数概率分布的第二类切比雪夫正交多项式逼近法。直接根据试验样本值,运用第二类切比雪夫正交多项式来拟合岩土参数的概率密度函数。研究结果表明,采用该方法所得到概率密度曲线非常接近实际统计频率分布,为较大样本条件下描述岩土参数的概率分布提供了一条新途径。     

基于HHT方法的爆破地震信号分析

在介绍HHT(Hilbert HuangTransform)理论的基础上,结合现场测试,将这种理论引入到爆破地震信号分析中。HHT方法主要通过经验模式分解方法将信号分解成有限的固有模态函数,并对每个固有模态函数进行Hilbert变换从而得到Hilbert谱。经过FFT、小波谱对比分析,结果表明:在爆破地震信号分析中,利用经验模式分解不需要固定的基函数,可将原始信号分解为少量的、频率自高至低排列的固有模态函数,分解过程具有自适应性、高效性;再通过Hilbert变换所得的谱图能清晰地反映原始地震信号能量随时间、频率的分布。HHT法能有效地提取爆破地震信号的主要特征,更能适应信号突变快、衰减快的特征,为进一步认识爆破地震波的传播机理、破坏原因和危害判据的确定提供了新的途径。     

Cutting parameter optimization for one-step shaft excavation technique based on parallel cutting method

The outcome of the cutting blasting in a one-step shaft excavation is heavily related to the cutting parameters used for parallel cutting method. In this study, the relationships between the cutting parameters (such as the hole spacing L and the empty hole diameter D) and damage zones were investigated by numerical simulation. A damage state index γ was introduced and used to characterize the crushing and crack damage zones through a user-defined subroutine. Two indices, i.e., η₁ and η₂ that can reflect the cutting performance, were also introduced. The simulation results indicate that an optimal value of L can be obtained so that the η₁ and η₂ can reach their optimal states for the best cutting performance. A larger D results in better cutting performance when the L value maintains its best. In addition, the influences of the loading rate and the in-situ stress on the cutting performance were investigated. It is found that an explosive with a high loading rate is suit for cutting blasting. The propagation direction and the length of the tensile cracks are affected by the direction and the magnitude of the maximum principal stress.     

A novel experimental system for performance evaluation of water powered percussive rock drill

A set of water powered excavation test system was developed for the comprehensive performance testing and evaluation of water powered percussive rock drill indoors. The whole system contains hydraulic power section, electronic control system, test and data acquisition system, and assistant devices, such as guideway and drilling bench. Parameters of the water powered percussive rock drill can be obtained by analyzing testing data, which contain impact energy, front and back cavity pressure, pressure and flow in each working part, drilling velocity, frequency and energy efficiency etc. The system is applied to test the self-designed water powered percussive rock drill SYYG65. The parameters of water powered percussive rock drill with impact pressure of about 8.9 MPa are 58.93 J for impact energy, and 8.97% for energy efficiency, which prove the effectiveness of system.     

变电站室内运行环境集中监控系统研制

针对目前变电站实行无人值班化的运行管理模式,详细介绍了变电站设备室运行环境集中监控系统的系统结构、关键技术、主要功能和运行效益。运行实践表明设备室运行环境集中监控系统是无人值班变电站辅助设施远方集中监控的有力工具,在变电站的安全运行及事故处理等方面起到了非常重要的作用。