顾及模型误差的基坑位移监测数据处理方法

由于基坑地质及观测环境的多样性和复杂性,基坑位移监测数据处理的理论模型与实际模型之间存在着模型误差。若模型误差显著,则所得位移拟合模型的精度较差,将影响后继变形分析的准确性。针对这一问题进行了深入研究,提出了顾及模型误差的最小二乘配置法,并指出在考虑观测值中可能存在粗差的情况下应进一步采用稳健估计法改善基坑监测面的拟合精度。推导了顾及基坑位移模型误差的最小二乘配置法的计算公式,说明了计算步骤。通过对多个实例的计算分析可知,该方法对基坑监测面拟合模型的精度增益能达到35%~48%,是一种比较实用的基坑位移监测数据处理方法。     

抗剪强度折减系数法在基坑土钉墙稳定性分析中的应用研究

深基坑土钉墙支护结构由于其经济可靠且施工快速简便,已在许多国家得到迅速的发展和应用。但由于土钉墙支护基坑边坡稳定性分析中土体计算参数的难以确定,常常误导土钉设计,造成众多基坑土钉墙事故的发生。笔者根据抗剪强度折减系数理论,并结合FLAC3D三维动态仿真模拟．分析了基坑土钉墙在开挖与支护作用下的应力场与位移场分布形态特征,据此得出其发生扰动后的综合强度参数,以此综合强度参数计算基坑坡体的安全系数,为基坑土钉墙稳定性分析提供了有效途径。     

基于激光扫描和无人机倾斜摄影的露天采场安全监测应用

为解决露天采场安全监测中观测困难、效率低下等问题,结合引用三维激光扫描和无人机倾斜摄影等三维测量技术开展露天采场安全监测融合应用研究。通过应用研究表明:2类技术结合应用可实现露天采场生产环境信息完整三维数据采集;通过统一控制点坐标系和基于点云特征点的迭代最临近点配准算法（ICP）可有效融合2类点云数据,能构建高时效、高精度、高分辨率的采场三维点云模型;融合的三维模型能直观再现采场生产环境,多尺度精准监测安全隐患问题,有效辅助采场生产安全规划;该技术方案弥补了人工安全监测缺陷,提高了安全监测效率,可适用于矿山尾矿库、水电大坝等其他危险源安全监测应用。     

沉管隧道对接端深基坑止水墙水下爆破对周围环境的影响研究

基于爆破动态效应的现场监测数据,研究了襄阳汉江鱼梁州沉管隧道对接端深基坑止水墙水下爆破对邻近建(构)筑物和周围水域的不利影响.结果 表明:爆源附近方圆50 rn范围内属于爆破振动近场区、方圆50～150 m范围内属于爆破振动过渡区、方圆150 m范围外属于爆破振动远场区;爆破振动近场区内薄壁支护结构爆破振动速度呈现高峰...     

电镀行业铜、镍、锌产排污系数的核算

针对现有国家《产排污系数手册》中电镀行业重金属产排污系数的不完整问题,以深圳市电镀企业分布较多的宝安区和龙岗区为研究对象,采用全面调研和个案实测的方法,将电镀行业典型镀种铜、镍、锌划分为18组四同组合。根据调研数据计算获得了每组四同组合的产排污系数,并通过个案实测验证了产排污系数的合理性及适用性。结果表明,产排污系数法计算的产污量误差在16%以内,排污量误差在30%以内,所以产排污系数能够推广应用于电镀行业重金属污染排放量核算。     

Energy consumption model and energy efficiency evaluation for CNC continuous generating grinding machine tools

Abstract

Machine tool, which is the basis energy consumed device in manufacturing system, its energy consumption model and energy efficiency evaluation are the prerequisites for energy saving in manufacturing. Considering the multi-energy-sources features,analysed the mathematical model of a CNC continuous generating grinding machine tool from the view of energy constitute. The energy sources of a CNC continuous generating grinding machine tool are classified into gear grinding system, grinding wheel dressing system and auxiliary system. Based on the power balance equations of energy flow, the energy flow system of a CNC continuous generating grinding machine tool is established. And then the energy consumption mathematical model of a CNC continuous generating grinding machine tool is set up by combining the power balance equations with the operating features of three kinds of energy sources. The case study shows that the proposed energy consumption model can provide fundamental support for energy consumption forecasting, energy efficiency analysis and energy-saving optimisation during the machine tool operation process.     

太阳能光伏发电成本及展望

针对太阳能电池的昂贵发电成本,分析和预测了国内外的太阳能光伏产业链的现状与发展;指出研制高效率、低成本太阳能光伏发电系统将是今后的任务。     

油田井下作业TK-5型全自动液气控制天车安全装置

叙述了油田井下作业TK—5型全自动液气控制天车安全装置的工作原理，分析了该装置的安全可靠性。     

浅谈生活垃圾的焚烧技术

阐述了生活垃圾的性质、焚烧前预处理、焚烧工艺及影响生活垃圾焚烧的因素。希望对从事生活垃圾焚烧技术研究开发工作的人员有参考作用。     

PCDD/F in waste water discharges from flue gas scrubbers of waste incinerators and coal operated power plants

Scrubber water samples from different combustion plants and gypsum samples as obtained in the flue gas washing with lime water were analyzed for PCDD/F. Three of the investigated nine scrubber water samples showed PCDD/F contents between 0,4 and 11,5 ng I-TEq/1 where as in the 17 gypsum samples examined only in a few cases very low levels of HpCDD and OCDD could be detected.