天津地铁北站车站施工的工程测量探讨

采用方向观测法和电子测距相结合的导线点观测方法代替传统的附（闭）合导线观测法进行地铁测量中的精密导线点观测;采用施工坐标系代替大地坐标系进行碎部施工放样工作。既保证了工程测量精度,也减少了数据的读取、录入和计算失误,从而提高了工程测量工作效率。     

某污水截流顶管工程中的施工控制

结合某污水截流工程的工程实践,探讨了长距离顶管施工中存在的一些主要技术措施,提出了一些顶管施工过程中的施工控制方法,并探讨了其效果和存在的不足之处。     

基于GIS的湖南省国土资源电子政务系统设计

本文分析了建设国土资源电子政务系统的必要性,提出了湖南省国土资源电子政务系统的总体框架和网络结构方案,对面向业务流程的多层电子政务设计思想和系统功能模块设计进行了详细的描述。文中阐述了涉及的电子政务搭建平台、国土资源数据中心等关键技术。     

甘肃引洮供水工程饱和黄土隧洞施工方法选择的工程地质研究

甘肃引洮供水一期工程总干渠13#、14#、15#隧洞围岩为al-lQ2饱和黄土,地下水位高于洞顶437m,饱和度一般在98%100%,水稳性很差。因此,该段隧洞施工方法的选择十分重要,从工程地质角度研究其工程特性,采用D rucker-Prager弹塑性模型、关联流动法则,模拟了传统钻爆法开挖时隧洞稳定性,计算表明,若采用钻爆法,由于围岩的岩性软弱,隧洞开挖后,在隧洞周围较大范围内存在应力降低区,隧洞位移十分迅速而且位移量非常大,洞顶下降发生塌方并引起地面沉降。从盾构法施工对地质条件的适应性分析,其施工风险相对较小,施工过程中可利用护盾很快封闭围岩,因此该段隧洞宜采用盾构法施工。     

浅议东莞航道1︰2000水下地形测量工程实践经验

本文以东莞市某航道水下地形测量为例,介绍了GPS-RTK配合测深仪技术在水下地形测量中的应用.依据项目特点,结合作者多年从事水下地形测量工作的经验,对创建国家级"文明样板航道"水下地形测量顺利实施提出了几点建议.     

基于“两证合一”的城镇地籍调查技术路线探讨与研究

根据物权法的规定,为保证不动产房屋产权的合法唯一性,房产证和土地证必须合二为一,这样同时可以减少登记机关重复审批以及加强政府机关效能建设。本文针对“两证合一”的城镇地籍调查作技术路线探讨与研究。     

基于栅格图片的建设用地图形辅助审查系统

本文介绍了在土地利用现状等基础数据库未建成的情况下,如何利用GIS技术实现栅格图件配准、拼接,界址点坐标无缝展示以及栅格图片的局部矢量化和面积量算等,为建设用地审查提供辅助依据,以提高用地审批的科学性和工作效率。     

现代渔业在新农村建设中的地位与作用

从战略、经济、文化、社区等4个层面论述了现代渔业对新农村建设的意义。从战略层面看,现代渔业是调整大农业内部结构,转移农村剩余劳动力的有效途径;从经济层面看,现代渔业是发展农村经济新的亮点和着力点;从文化层面看,现代渔业是促进现代乡村文化建设的重要基石;从社区层面看,现代渔业有助于运用先进的理念引领新农村社区建设。     

ARD generation and corrosion potential of exposed roadside rockmass at Boeun and Mujoo,South Korea

Acid rock drainage (ARD) is a longstanding problem often associated with the resulting corrosion due to the acidity generated from sulfidic oxidation. To evaluate characteristics of ARD and corrosion, samples from the road side rock mass of Boeun and Mujoo were analysed using X-ray diffraction, acid/base accounting and Leaching tests. The results indicated that many samples had a pyritic origin and can be regarded as acid-generating rocks. The Leaching test showed that the average pH of the leachates of samples from both Boeun and Mujoo were moderately acidic, ranging from 3 to 4. Interestingly, as acidity increases from pH 4, the SO₄₋, Fe, Al and Mg concentrations increase abnormally. Samples from roadside slope of Mujoo showed high corrosive potential. Maximum sulfide oxidation rate of a sample taken from Mujoo was as high as 5,166 mg/kg/week.     

Prediction of in-situ block size distributions with reference to armourstone for breakwaters

Understanding a quarry in terms of its potential for breakwater construction materials presents a special challenge for the engineering geologist. Unlike blasting in aggregates and mining operations, optimisation of the extraction process has a focus on the potential for production of large blocks for armourstone. These blocks weighing many tonnes are used for cover layers to resist wave action. The quarry-run is used for breakwater core. If the quarry has been developed as a source of materials dedicated to a breakwater construction project, the success of the project depends greatly on the blasting and production of rock sizes that are required and the avoidance of leaving a massive quantity of unused materials behind in the quarry after project completion. Prediction of in-situ block sizes such as from joint spacing data, provides the most critical input for the prediction of the blast pile block size distribution (BBSD), which in turn is a vital early design input if the constructed breakwater is to be economical as well as effective.This paper is part of a series of papers that introduces the coastal engineering motivation for this work on engineering geology, giving reasons why the prediction of the fragmentation curve of the blast products in a dedicated quarry is of such economic importance for breakwater projects. The first step towards blasted block size distribution (BBSD) prediction is the prediction of the in-situ block sized distribution (IBSD), the main subject of this paper. Drawing together research methods from the 1990s and the rock mechanics principles of discontinuity analysis, a practical step by step methodology for IBSD assessment that includes approaches that are not reliant on specialised computer software is presented. Continuing on the practical theme, a new extension of the volumetric joint count approach is suggested for IBSD prediction for the case when sparse borehole data is all that is available. A case study of IBSD assessment and the associated BBSD and blast assessment is presented from a Carboniferous limestone quarry. For clarity, details of blast design and yield curve prediction that are recommended for use in the context of armourstone production, have been presented in a companion paper. The Rosin-Rammler equation is used as an example form for the BBSD prediction of a dedicated quarry and the potential for breakwater project optimisation is illustrated. The final section sets out a method for directly comparing yield curves together with the demand for materials set by the breakwater design. On the same plot, sizes where there is a relative shortfall in production can be identified. The dependence of effective breakwater design on accurate quarry yield prediction and quarry blasting performance is discussed.