SMW工法在天津空客A320总装线项目基坑支护中的应用

以天津空客A320总装线项目总装厂房基坑支护工程为例,介绍了SMW工法施工在天津软土地区的应用情况.实践证明,该工法具有支护变形小、止水效果好、工期短、工程造价低、节能环保、施工方便等优点,在天津软土地区有广阔的应用前景.     

双液静压注浆在丰沙线35号桥卵漂石地层的应用

在丰沙线35号桥加固工程的4、5号墩钻孔灌注桩施工中,采用回转滚刀钻进卵漂石地层,为确保孔壁稳定,对桩孔壁进行了双液注浆.在注浆孔成孔、压浆管安放、孔口架桥封堵及双液压浆过程中遇到了较多棘手问题,经施工现场多次试验和改进,解决了双液浓度及注入配比、架桥封堵孔口、双液分离注浆、窜浆处理和合理压浆量控制等技术难题,并取得了理想的注浆效果,确保了钻孔灌注桩顺利进行.     

芦家山一号隧道防排水技术及其分析

以西(安)合(肥)大通道--陕西境商界高速公路芦家山一号隧道防排水施工的工程实例为基础,着重论述了复合式衬砌隧道综合防排水施工工艺、关键部位施工控制要点以及材料的选择.     

旋挖钻机动力系统功率匹配技术的应用

旋挖钻机动力系统是发动机和液压传动相结合的统一体,单纯液压系统的节能控制并不能取得较好的整机节能效果,发动机的控制也对整机节能性有很大影响.对发动机与液压系统的功率匹配控制进行了研究,提出了功率极限载荷控制技术,并在NR220旋挖钻机上应用了德国力士乐公司的电子功率极限负荷控制技术,收到了良好的效果,保证了旋挖钻机的高效节能和对各种工作环境的适应能力.     

低温环境下铜同位素分馏的若干重要过程

Cu同位素是一种新的地球化学示踪剂.正确运用这一同位素示踪技术的前提是对其同位素分馏机理和过程有足够的认识.本文报道了室温下CuSO4·5H2O结晶过程产生分馏的实验结果,并系统地总结了低温条件下Cu同位素分馏的一些重要过程,其中包括沉淀过程、还原过程、吸附过程、生物过程等.     

EKL-3A型全自动水文缆道测验系统

EKL-3A型全自动水文缆道测验系统是专为水文缆道测流研制的自动化控制系统。该系统采用工业控制计算机和PLC可编程控制器作为完成自动化缆道测流的控制核心,配合交流变频调速、光电编码测距定位、流速自动测算、音频信号传输等成熟技术和计算机测流控制软件及流量成果自动生成软件等构成。系统可通过计算机对缆道测流装置进行全自动、半自动、手动测流控制,各种测量方式均可最终生成断面流量报表和断面流速分布曲线图。     

三维抛物方程Douglas交替方向隐格式的稳定性和收敛性

作者研究三维变系数抛物方程 Douglas交替方向隐格式的稳定性和收敛性。采用 H1能量估计方法 ,证明格式按离散 H1范数是绝对稳定的 ,并且收敛阶为 O(Δ t2 + h2 )     

新型波浪采集系统平台设计

主要介绍了新型波浪采集系统的设计思想与主要参数，采集、存储、运算和电源控制部分的结构与组成，以及各部分的特点和关键技术。     

基于EOF分析对南海西北海域水体光谱特性的研究

This study presents an analysis of the spectral characteristics of remote sensing reflectance(R_(rs)) in northwestern South China Sea based on the in situ optical and water quality data for August 2018.R_(rs)was initially divided into four classes,classes A to D,using the max-classification algorithm,and the spectral properties of whole R_(rs) were characterized using the empirical orthogonal function(EOF) analysis.Subsequently,the dominant factors in each EOF mode were determined.The results indicated that more than 95% of the variances of R_(rs) are partly driven by the back-scattering characteristics of the suspended matter.The initial two EOF modes were well correlated with the total suspended matter and back-scattering coefficient.Furthermore,the first EOF modes of the four classes of R_(rs)(A-D R_(rs)-EOF_1) significantly contributed to the total variances of each R_(rs) class.In addition,the correlation coefficients between the amplitude factors of class A-D R_(rs)-EOF_1 and the variances of the relevant water quality and optical parameters were better than those of the unclassified ones.The spectral shape of class AR_(rs)-EOF_1 was governed by the absorption characteristic of chlorophyll a and colored dissolved organic matter(CDOM).The spectral shape of class B R_(rs)-EOF_1 was governed by the absorption characteristic of CDOM since it exhibited a high correlation with the absorption coefficient of CDOM(a_g(λ)),whereas the spectral shape of class C R_(rs)-EOF_1 was governed by the back-scattering characteristics but not affected by the suspended matter.The spectral shape of class D R_(rs)-EOF_1 exhibited a relatively good correlation with all the water quality parameters,which played a significant role in deciding its spectral shape.