供水管网地理信息系统中爆管分析的算法研究   总被引：1，自引：0，他引：1  

胡新玲  张宏飞 《测绘科学》2008,33(4)

爆管关阀分析是供水管网地理信息系统中重要的空间分析功能之一,目前已建系统的爆管分析功能存在着算法繁琐或功能简单、不具通用性等缺点。本文以高质量的源数据为基础,根据系统和爆管分析的需求建立合理的数据模型,设计了爆管关阀分析算法,该算法克服现有算法的不足,剔除了可关可不关的阀门,得到正确、经济的关阀门方案,并列出了受影响的用户。将此设计方案应用于"新疆石油管理局供水地理信息系统"中,成功地实现了爆管分析,体现出了该算法简洁、高效、准确、通用的优越性。  相似文献   

Fractal-like adsorption kinetics of Pb^2＋ in rocks   总被引：1，自引：0，他引：1  

Longjun Xu  Zhengguo Zhou  Chenglun Liu  Xuefu Xian 《中国地球化学学报》2008,27(2):126-129

The adsorption kinetics of Pb^2＋ in rocks has been studied using ion selective electrodes and atomic absorption spectrophotometer. The results showed that the adsorption process is a fractal-like reaction. The adsorption rate was relatively high before 30 minutes, and then dropped. The saturated adsorption capacity （a） of Pb^2＋ and kinetic parameters （b, a, D and k） increased with increasing initial concentrations of Pb^2＋. These parameters （except a） decreased while Na^＋ was present in the solution. Furthermore, the smaller the rocks were in grain size, the bigger these kinetic parameters would be, though the parameter a was almost constant.  相似文献   

陕西太白双王角砾岩型金矿的角砾岩特征     

滕道鹏 《矿产与地质》2008,22(5):396-399

双王金矿床是秦岭泥盆系地层中一种类型独特富钠角砾岩型金矿床,在分析研究矿床赋矿地层、角砾岩带、角砾岩体的矿化及分带特征的基础上,阐述了该矿床的分带特征与金矿化的关系。  相似文献   

东北大兴安岭多年冻土区工程地质特征及评价   总被引：4，自引：1，他引：3  

杨永鹏  程东幸  伏慧霞 《工程地质学报》2008,16(5):657-662

土体在冻结状态具有极高的压缩模量, 具有弹性体的工程地质特征。但是在冻土地温升高过程中, 这种特征急剧衰减, 产生蠕变和流变, 建筑物地基强度降低, 导致建筑物基础破坏。同时土体在冻结过程中产生的冻胀作用也将导致建筑物基础的破坏。东北大兴安岭地区多年冻土为高纬度低海拔多年冻土, 其分布具有明显纬度地带性特点。本文在分析该区多年冻土分布特征及冻土工程地质特点的基础上, 对由于土体的冻胀和融沉导致的建筑物基础的危害进行分类研究, 针对性的提出了用热棒降低土体温度以保证多年冻土稳定及用排水的方法减少水对建筑物地基多年冻土影响的工程病害处理措施。  相似文献   

地下矿产开采对天然气管道工程的安全影响评价     

万继涛  ;胡松涛  ;韩祥银  ;张新文 《山东地质》2008,(6):35-37

西气东输天然气管道工程途经兖州市,穿越杨庄、杨村、兴隆庄等煤矿矿区,压覆煤层埋深变化较大。该文采用预测法对各煤矿在不同开采条件下分煤层对管道运营安全的危害程度进行了评价分析。通过计算表明,煤矿开采埋深越浅,煤层越厚,对管道危害越严重。兴隆庄煤矿3煤层、杨村煤矿煤16t、煤17开采对管道影响强烈,杨庄煤矿煤16t、煤17开采对管道影响中等,兴隆庄煤矿煤16t、煤17开采对管道运营影响小。  相似文献   

基于MapObjects的城市污水管网信息系统     

桑稳姣  阮戟 《地理空间信息》2008,6(2):22-24

以地理信息系统为技术支持,结合在线监测技术,在VB环境下利用MapObjects控件进行二次开发建立了污水管网信息系统。该系统能对污染源排污状况及污水管网运行状况进行实时监控,是城市污水管网运行管理强有力的工具。  相似文献   

内蒙古阿鲁科尔沁旗好力宝铜钼矿床地质特征及找矿方向   总被引：5，自引：1，他引：4  

沈光银 《地质与资源》2008,17(4):273-277

好力宝铜钼矿床属与燕山期隐伏的隐爆角砾状斜长花岗斑岩和碎裂次石英斑岩有关的热液脉状和斑岩型矿床.铜钼矿体受隐爆角砾岩筒和岩体控制,矿化产在蚀变隐爆角砾岩和硅化带中.今后的找矿方向应侧重于对斜长花岗斑岩与围岩接触带和碎裂次石英斑岩中化探异常和低阻高极化异常地段的探索.  相似文献   

Cyclic palaeokarst surfaces in Aptian peritidal carbonate successions (Taurides, southwest Turkey): internal structure and response to mid-Aptian sea-level fall     

&#x;smail mer Y&#x;lmaz  Demir Alt&#x;ner 《Cretaceous Research》2006,27(6):814-827

The sedimentology and cyclic stratigraphy of palaeokarst structures in Aptian peritidal carbonate successions are interpreted using field and laboratory microfacies analyses of closely spaced samples from measured outcrop stratigraphic sections in southwest Turkey. Cycles displaying shallowing-upward metre-scale cyclicity are generally composed of lime mudstones/wackestones/packestones at the bottom and stromatolites or lime mudstones with charophytes and ostracods at the top. Subaerial exposure structures such as in situ karst breccias, dissolution vugs/pipes, mud cracks and sheet cracks are encountered at the top of the cycles. The presence of limestone layers between the successive karst breccia levels indicates that they are in situ palaeokarst structures, not recent karstifications or deep penetration from the upper palaeokarst surface down to the older strata. Palaeokarst breccia deposits are interpreted as mantling breccia formed as a result of epikarstification. Three main palaeokarst levels are recorded in nearly all sections. The sedimentology of the palaeokarst breccias, their position in cyclic peritidal carbonates and the biostratigraphic framework are used to trace the record of the global mid-Aptian sea-level fall in the southwest Taurides. The successive occurrences of three karst breccia levels close to the mid-Aptian sea-level fall correspond to falling periods of high-amplitude sea-level fluctuation within a late high-stand or early fall condition of a third-order sea level.  相似文献   

Monitoring of Over Cutting Area and Lubrication Distribution in a Large Slurry Pipe Jacking Operation   总被引：1，自引：0，他引：1  

Saeid Khazaei  Hideki Shimada  Takashi Kawai  Junichi Yotsumoto  Kikuo Matsui 《Geotechnical and Geological Engineering》2006,24(3):735-755

Slurry pipe jacking was firmly established as a special method for the non-disruptive construction of the underground pipelines of sewage systems. Pipe jacking, in its traditional form, has occasionally been used for short railways, roads, rivers, and other projects. Basically the system involves the pushing or thrusting of concrete pipes into the ground by a number of jacks. In slurry pipe jacking, during the pushing process, mud slurry and lubricant are injected into the face and the over cutting area that is between the concrete pipes and the surrounding soil. Next, the slurry fills voids and the soil stabilizes due to the created slurry cake around the pipes. Fillings also reduce the jacking force or thrust during operation. When the drivage and pushing processes are finished, a mortar injection into the over cutting area is carried out in order to maintain permanent stability of the surrounding soil and the over cutting area. Successful lubrication around the pipes is extremely important in a large diameter slurry pipe jacking operation. Control of lubrication and gaps between pipes and soil can prevent hazards such as surface settlement and increases in thrust. Also, to find voids around the pipes after the jacking process, in order to inject mortar for permanent stabilizing, an investigation around the pipes is necessary. To meet these aims, this paper is concerned with the utilization of known methods such as the GPR (Ground Penetrating Radar) system and borehole camera to maintain control of the over cutting area and lubricant distribution around the pipes during a site investigation. From this point of view, experiments were carried out during a tunnel construction using one of the largest cases of slurry pipe jacking in Fujisawa city, Japan. The advantages and disadvantages of each system were clarified during the tests.  相似文献   

油压夯管锤蓄能器与活塞振动耦合性的数学解析          下载免费PDF全文

李国民 《探矿工程》2002,(1):52-54

蓄能器容积的变化与夯管锤的工作过程是紧密联系在一起的，由于活塞的前后运动以及在运动过程中的每一时刻所需要的油量不同的，理想状态就要通过蓄能器的容积变化来调节，就是说蓄能器的容积变化要与夯管锤的冲击振动相耦合。简要介绍了油压夯管锤结构原理，分别解释了油压夯管锤蓄能器与夯管锤的容积压力耦合。  相似文献