城市地下管线数据库动态维护   总被引：5，自引：0，他引：5  

钟远根  俞明  毛琳 《现代测绘》2003,26(2):22-24

城市地下管线测量是城市测量的重要内客，建立的地下管线数据库后续的维护工作，是常态的测绘工作，本文针对城市地下管线动态维护工作，谈谈其重要性、方法及一些看法。  相似文献   

伊犁盆地南缘侏罗系沉积微相及铀矿控矿条件研究   总被引：10，自引：0，他引：10  

刘家铎  林双幸 《矿物岩石》2003,23(1):30-36

伊犁盆地是一个中生代陆相盆地，其南缘下－中侏罗统含煤地层十分发育。水西沟群划分为八道湾组、三工河组和西山窑组，沉积相分属于冲积扇相、三角洲相和湖泊相。可地浸砂岩型铀矿主要赋存于冲积扇扇中辫状河道微相和三角洲平原分流河道及泥炭沼泽微相。其铀矿床的主要控制因素是：盆地基底及周边地层含铀性；盆地周边构造发育条件；岩相古地理；沉积微相；成岩作用；地下水作用和氧化－还原地球化学分带。  相似文献   

Long-term thermal evolution and effect of low power heating in an underground quarry     

Catherine Crouzeix  Jean-Louis Le Mouël  Frédéric Perrier  Patrick Richon  Pierre Morat 《Comptes Rendus Geoscience》2003,335(4):345-354

Vertical profiles of temperature have been monitored in the atmosphere of an underground quarry since June 2001. A long-term temperature increase of the order of 0.1 °C per year is observed. Three heating experiments with 100-W sources, performed to study plume dynamics, can also be used to investigate the effect of visits on this increase. Ten days after the 24-h heatings, the initial state is not restored. Artificial contributions to the observed long-term temperature trend, triggered by internal heat release, thus cannot be ruled out. This experiment defines strict criteria for the underground monitoring of global warming or the preservation of painted caves. To cite this article: C. Crouzeix et al., C. R. Geoscience 335 (2003).  相似文献   

"九五"我国地震地下流体研究的主要科学进展   总被引：6，自引：1，他引：6  

刘耀炜 《地震》2002,22(4):1-8

总结了“九五”以来我国在地震地下流体研究方面的主要科学进展，从流体前兆成因、异常识别与预报技术，流体的作用与前兆机理和观测技术等方面的研究进展进行了归纳论述。还阐述了地震地下流体研究的科学发展问题。  相似文献   

利用高精度磁法探测地下遗弃炮弹   总被引：3，自引：0，他引：3  

李远强  李祥强 《城市地质》2002,14(2):40-42,45

本文介绍一种利用磁法探测地下遗弃炮弹的方法；指出在探测地下遗弃炮弹中的，磁法是非常有效的方法技术，仅考虑磁异常的存在和位置，而无须考虑磁异常的符号，通过资料处理，剔除地面磁性体的干扰，圈定局部磁异常，即可推断出地下遗弃炮弹的位置及大致埋深，为工程建设和施工提供重要信息；能利用新型的磁法和计算机技术，在短期内完成大面积的工作，效率高，前景好。  相似文献   

瞬变电磁法在地下金属物体探测中的应用   总被引：2，自引：0，他引：2  

李远强 《城市地质》2002,14(3):29-32

一种无损高分辨率电磁探测技术（TEM）－瞬变电磁法，它不同于探地雷达。它应用探测的电导率数据成图，可提供解释出地下埋藏的金属物体及相关信息，主要用于地下环境工程、市政工程、考古、军械遗弃场地的普查探测等领域，在设计、开挖、施工过程中，能够充分了解地下金属物体（金属管线等）的分布及地质情况，也能充分利用探测成果在盲区做集中、具体的工作。由高分辨率瞬变电磁技术所得的信息是非常重要的。  相似文献   

白银地区水氡异常与地震活动关系浅探     

李富刚  李玉凤  魏著玲 《高原地震》2002,14(4):49-52

对白银地区水氡值异常与中强地震的活动关系进行了一些经验性的探索。  相似文献   

MAPGIS处理系统在地下管线探测中的应用   总被引：1，自引：0，他引：1  

刘军利王万顺  赵振中徐辉 《中国煤田地质》2003,15(4):58-60

以MAPGIS6．0版本为基础，介绍利用图解法、测量展绘、图形数字化及智能扫描数字化四种处理地下管线探测成果的处理方法及工作程序、应用范围及精度等，为管网的设计、施工、运行、维护、抢修等提供可靠的信息。使用该方法简化了专业管线设计规划的过程，提高地下管线管理及资料查找的效率，尤其方便了煤气管网信息系统管理中的补、绘图工作。  相似文献   

Holocene Yellow Silt Layers and the Paleoclimate Event of 8200 a B.P. in Lop Nur, Xinjiang, NW China     

LIU Chenglin  WANG Mili  JIAO Pengcheng  LI Shude  CHEN YongzhiCollege of Environmental Sciences  Peking University  Yiheyuan Ro  Haidian District  Beijing  Institute of Mineral Resources  Chinese Academy of Geological Sciences  Baiwanzhuang Ro  Beijing 《《地质学报》英文版》2003,77(4):514-518

Many yellow silt layers have been identified in the Holocene sediments in the last lake of Lop Nur (playa), Xinjiang, northwestern China. Statistics of drill-hole cores have revealed more than one hundred layers, which exhibit regularity in time sequence. Study has further verified that these yellow silt layers were deposited through eolian processes. The time-frequency distribution diagram shows an obvious peak occurring at about 8200 a B.P., which is consistent with the dry, windy and cold climate event occurring at 8200 a in other places around the world. Therefore, this event is regarded as a response to the global climate change.  相似文献   

Estimation of rock mass strength and deformability in 3-D for a 30 m cube at a depth of 485 m at Äspö Hard Rock Laboratory   总被引：2，自引：0，他引：2  

P. H. S. W. Kulatilake  Jinyong Park  Jeong-gi Um 《Geotechnical and Geological Engineering》2004,22(3):313-330

The rock fracture data provided by Swedish Nuclear Fuel and Waste Management Company were used to develop a 3-D stochastic fracture network model for a 30 m cube of Äspö diorite located at a depth of 485 m at Äspö Hard Rock Laboratory, Sweden. This fracture network model was validated. A new procedure is developed to estimate rock block strength and deformability in three-dimensions allowing for the anisotropy and incorporating the inherently statistical fracture geometry for the selected cube. The mean rock mass strength was found to be 47% of the mean intact rock strength of 297 MPa at 485 m depth. The mean rock mass modulus was found to be 51% of the intact rock Young's modulus of 73 GPa. The rock mass Poisson's ratio was found to be 21% higher than the intact rock Poisson's ratio of 0.28. These percentages indicate the level of weakening of the rock mass due to the presence of fractures. The ratio of mean major principal rock mass strength/mean minor principal rock mass strength turned out to be 1.28. The ratio of mean major principal rock mass modulus/mean minor principal rock mass modulus turned out to be 1.21.  相似文献