一种基于结构面密度的岩体结构均质区划分方法

根据结构面发育的主要特点以及工程实际需要，合理选择划分岩体结构均质区的岩体参数是必要的。在某些特殊情况下，选择结构面密度作为划分均质区的依据更为合适。为此，提出了一种基于结构面密度的岩体结构均质区划分方法，即密度分区方法，并通过对西南某大型水电站工程侧裂结构面的密度分区，证明了该方法的可行性。该方法简单、直观、易于操作，有很强的推广实用价值。     

岩质边坡结构面抗剪强度参数的实用确定方法研究

对坡高不大、坡体量较小的中小岩质边坡,由于资金和技术条件所限,目前确定岩体结构面抗剪强度参数大多来自规范和经验,边坡处治往往很难兼顾安全性和经济性。本文对15~30m高岩质边坡中控稳结构面抗剪强度参数粘聚力c、内摩擦角在边坡稳定中各自发挥的作用进行了定量分析。研究表明:当坡高小于25m时,抗剪强度参数中c值是边坡稳定的主要控制因素,因而提出采用现场原位抗切试验确定c值,再结合规范取值确定值。这种方法通过现场实测确定了主要参数,同时克服了做大型原位剪切试验时间长和费用高的缺点,是一种经济、实用的边坡结构面抗剪强度参数确定方法。     

岩体结构面抗剪强度参数试验研究

从工程实际出发,讨论了岩体结构面直剪试验方法的选取原则。工程实例表明,采用现场原位抗切试验确定结构面c值,再结合规范取值确定φ的方法更适用于坡高小于25m的中小岩质边坡。结合乌江构皮滩水电站岩体结构面大型原位抗剪试验成果,分析了结构面性状对结构面抗剪强度的影响。本文还通过多组室内试验研究了水对结构面抗剪强度的弱化作用,得出若干有益的结论。     

基于三维网络模拟基础的复杂有限块体的自动搜索及其空间几何形态的判定

首先应用随机不连续面三维网络模拟技术建立不连续面分布的概率统计模型。在此基础上通过编程实现对复杂有限块体的自动搜索并确定其空间几何形态，给出其空间定位参数和尺寸。在对块本的有限性进行判断时，提出“有形即是有限”的分析方法。     

非线性法向变形节理对弹性纵波传播的影响

从波的弹性位移出发，推导线性位移不连续模型，然后引入等效位移假设，建立节理非线性位移不连续模型。依据所建立的非线性模型，获得垂直入射纵波在非线性法向变形节理处传播的透射和反射系数的解析解。利用该解析解，研究节理初始刚度、节理闭合量与允许闭合量的比率以及入射波频率对节理透反射系数的影响，并与已有的数值计算结果进行比较，两者吻合很好。     

Too stressed out to participate? Examining the relation between stressors and survey response behavior.

Despite the use of survey-based organizational data in many studies of organizational behavior, survey response behavior and nonresponse are rarely studied phenomena. This study expands on previously proposed survey response and nonresponse frameworks by integrating the job stress literature. The authors investigated whether overload, role ambiguity, and role conflict experienced by individuals relate to survey response behavior. Using organizational citizenship behavior theory and social exchange theory as theoretical frameworks, the authors proposed that nonrespondents experience higher levels of stressors than respondents. Data collected in a longitudinal field study partially supported the hypotheses. As hypothesized, overload increased the likelihood of nonresponse. Contrary to hypotheses, role ambiguity decreased the likelihood of nonresponse. Role conflict was not significantly related to nonresponse. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

浅析如何规范开展低压营业普查工作

本文笔者根据多年的低压配电网络的线损工作经验对如何规范的开展低压营业普查工作进行讨论,其次,笔者从电力生产的特点这一角度出发阐述了营销管理的重要性,总结了电力公司开展营业普查工作的原因,并且在实际工作中找出了开展低压营业普查工作的办法,希望本文笔者的分析和研究会对企业效益的流失、电网运行的安全稳定性起到一定的帮助作用。     

数值分析在确定竖井保安矿柱与回采方案中的应用

本文首先简述了矿层单元与竖井单元的理论结果,讨论了矿山开采岩体分级在选定力学模型中的作用。结合某矿山竖井保安矿柱重新圈定的实际问题,运用矿层单元与竖井单元进行了板状矿体开采对竖井影响的三维分析,充分发挥电子计算机与数值方法的长处,经过对多种可能回采方案的试算与比较,得到了矿山生产设计中急需的参考数据。     

鹤壁六矿-300 m 水平地应力场与矿压显现特征

分析鹤壁六矿-300 m水平实测地应力分布特点, 采用位移不连续数值方法及基于有限实测点的逐次逼近计算方法模拟工程区域的岩体初始应力场。通过对水平面内的次主应力分布特征的分析, 探讨复杂断裂构造对区域岩体初始应力状态的影响, 并通过对该工程区域内矿压显现特征与原岩应力分布特征的对比, 定性分析断层构造对巷道稳定及煤和瓦斯突出的影响。结果表明:复合断层的叠加扰动影响造成原岩应力状态的区域性非均匀分布特征, 从而使该矿煤和瓦斯突出及巷道的稳定性具有明显的区域差异。     

Application of the short‐open calibration technique to vector finite element method for analysis of microwave circuits

A novel numerical de‐embedding scheme called the short‐open calibration (SOC) technique, in conjunction with the vector finite element method (FEM), has been developed to characterize two‐port network of arbitrarily shaped, three‐dimensional discontinuities in microwave circuits. This SOC technique is effectively implemented into the FEM for boundary truncation of the unbounded circuit structures. In such a manner, fast convergence of iterative solver for large‐sparse linear matrix equations from FEM is achieved. The SOC technique is used to remove parasitic effects brought by the approximation of the impressed voltage source and also the problem of resulting consistency between the two‐ and three‐dimensional simulations. Scattering parameters of discontinuous sections are constructed from the definition of port voltages and currents. Numerical solutions are well compared with those published in the available literatures. It is demonstrated that the features of the SOC technique are advantageous when combined with FEM for electromagnetic problems. Copyright © 2002 John Wiley & Sons, Ltd.