鄂尔多斯块体西缘及西南缘深部电性结构与该区地质构造的关系   总被引：6，自引：0，他引：6  

屈健鹏 《内陆地震》1998,(4)

对在地理位置上具有一定代表性的鄂尔多斯块体西缘及西南缘的３ 条大地电磁剖面进行了分析。盐池—阿拉善左旗剖面：整条剖面上均有壳内低阻层和上地幔低阻层分布,低阻层在银川断陷盆地上隆。定边—景泰剖面：壳内低阻层仅出现在弧形断裂带区,但上地幔低阻层在整个剖面上都有分布。在弧形断裂带区上地幔低阻层埋藏深度加大,但并不上隆,这与北面银川断陷盆地的上地幔上隆形成反照。分析认为,银川断陷盆地属于拉张性质,而弧形断裂带区属于挤压性质,由于均衡调整作用,造成了两者上地幔结构的反差。成县—西吉剖面：以天水太京测点为界,其南、北两段的电性结构差异较大,这为划分南、北两个地质单元提供了深部结构上的依据  相似文献   

The application of rock mass classification systems to underground excavation in weak limestone, Atatürk dam, Turkey     

A. Tu rul 《Engineering Geology》1998,50(3-4):337-345

The Atatürk dam was built across the Firat River on clayey limestone. A grout curtain, providing impermeability in the left and right abutments, was done in grouting galleries. The well known rock mass classification systems for tunneling purposes [rock structure rating (RSR), rock mass rating (RMR) and rock mass quality index (Q)] were used to classify the rock mass along these galleries. Based on RSR, RMR and Q values, the rock masses in the galleries have been classified into three different classes. Correlation between the three classification systems is discussed and suggestions are made for using rockbolt, shotcrete with wiremesh and steel ribs for supporting the rock mass.  相似文献   

地下采煤的缓倾边坡变形机制     

李俊  刘汉超 《地质灾害与环境保护》1998,9(3):17-24,34

通过某地边坡变形的环境条件和多年监测资料,提出地下采煤的缓倾边坡变形机制,即由地下采煤产生的岩层弯曲下沉侧推效应和央体松动扩容侧推效应,以及地下水作用产生的空隙水压效应导致的边坡变形,并对边坡变形机制进行了验证。  相似文献   

地下目标瞬时散射的时域有限差分法数值模拟   总被引：2，自引：1，他引：2       下载免费PDF全文

王建  彭仲秋  谢处方 《地球物理学报》1996,39(Z1):349-356

采用时域有限差分（ＦＤＴＤ）法数值模拟电磁脉冲波的入地传输，以及地下二维目标的瞬时散射，详细讨论了ＦＤＴＤ法中主要参数的取值原则．在稳定条件下所取时间间隔随波进入不同煤质而不同，以满足因果律．通过数值计算证明，在无耗空间得到的吸收边界条件也适用于有耗媒质．数值模拟在地面接收到的地下目标的回波响应与有关文献的结果一致．  相似文献   

油气成藏系统划分方法及其应用   总被引：4，自引：0，他引：4  

付广  王宏伟 《海相油气地质》1996,1(4):21-25

在深入研究油气藏系统理论和油气势能理论的基础上，利用油气势能在剖面上的极值点和储集层中油气势能等值线的分隔槽，确定油气成藏的上边界和四周边界，建立了一套油气成藏系统的划分方法，并将其应用于松辽盆地大太长垣以地区扶余油层的油气成藏系统的划分中，其结果较客观地反映了该区扶余油层油气聚集规律，充分证明了此方法的实用性。  相似文献   

Some statistic characteristics of “Underground Hot vortex” in China during 1980–1993 (I)     

Maocang Tang  Xiaoqing Gao 《中国科学D辑(英文版)》1997,40(6):561-568

Using ground temperature data from meteorological stations as well as earthquake, ground tilt and precipitation data, the spatial-temporal distribution of “Underground Hot Vortex” (UHV) in China was analyzed in detail. The results show that concerning an “Underground Hot Vortex” cell, its life-span is 3–8 seasons, 1.5 years on average; the mean horizontal scale is 600 km and its characteristic velocity is about 400 km/a; UHV is likely to appear in some areas where the crustal movement is intense and the absolute value of vertical deformation rate is relatively high; its activity could hardly be detected in the area where the crust is stable and the vertical deformation is weak; most of “Underground Hot Vortex Groups” originate from the edge of Indian Plate, then migrate eastwards with a leaping-frog style. 5–10 years are needed for their arrival in the eastern border of China. Their horizontal migrating velocity is 200–500 km/a which is nearly equal to the characteristic velocity of a single UHV. Project sponsored by the National Climbing Project and Key Project of the Chinese Academy of Sciences.  相似文献   

地下宇宙线研究的物理和工程应用          下载免费PDF全文

周大庄  周志文  程纯杰  马福胜 《地球物理学报》1987,30(5):542-548

在原初宇宙线与大气物质的相互作用中产生的μ子具有很强的地下穿透能力和相当稳定的流强,适合于作地质检测。利用地下μ子方向强度可以做大置物理方面的基础研究和开辟许多重要的实际应用途径。本文简要介绍了μ子物理,讨论在不同研究领域中的应用,特别是在地质和土木建筑“诊断”方面的实际应用。  相似文献   

The aging of gypsum in underground mines   总被引：1，自引：0，他引：1  

Christophe Auvray  Franoise Homand  Claudia Sorgi 《Engineering Geology》2004,74(3-4):183-196

The aging properties of gypsum extracted from two underground mines in France (Livry–Gargan and Grozon) have been highlighted by means of observation performed using scanning electron microscopy on samples taken along horizontal boreholes drilled through to the middle of several pillars. The aging process is exhibited by the presence of traces of dissolution (edges of the dissolved crystals, corroded crystalline surfaces, important intra- and intercrystalline space). These dissolution figures decrease in number and in intensity from the wall heading towards the middle of the pillar. The “older” pillars display a greater number of dissolution traces than the “more recent” pillars. Then, the role of the aging has been assessed by determining various physical and mechanical parameters on cylindrical samples of 38 mm in diameter and 76 mm in height, machined from the set of drilled boreholes. The following parameters have been quantified: density, grains density, total porosity, porosity accessible to water, intrinsic permeability to nitrogen, velocity of ultrasonic compression and shear waves, dynamic Young's modulus, dynamic Poisson's ratio, uniaxial compressive strength and static Young's modulus. Significant variations in parameter values between the wall and the middle of the pillar were recorded and recognized as being strongly correlated with the intensity of dissolution traces, and hence with gypsum aging.  相似文献   

地震地下流体数字化观测初探   总被引：2，自引：0，他引：2  

魏汝庆  王华 《山西地震》2003,(1):14-17,26

“九五”期间，中国地震局在山东聊城水化站对地下流体学科数字化改造的7种仪器进行了试验，并于1999年11月通过验收，现已运行3a。为全面总结上述7种数字化仪器的运行情况，对各类仪器的优缺点做了综合评定，同时对多种数字化记录资料与模拟记录资料进行了对比分析，得出SD－3A型测氢仪、GWK－201型测氦仪、LN－3数字式水位仪工作性能较稳定、测值连续准确可靠的结论。  相似文献   

井水位气压加卸载响应比   总被引：4，自引：0，他引：4       下载免费PDF全文

魏焕  张昭栋  耿杰  王忠民  于立业 《地震工程学报》2003,25(1):82-85

将加卸载响应比的理论和方法引入到地下水位资料中．根据承压井水位的气压效应，将地球表面大气压的随机变化做为加载和卸载的力源，从理论上论征可以应用大气压变化而引起的井水位变化来计算加卸载响应比，并给出了计算方法．以此方法计算了1995年9月20日山东苍山Ms5．3地震前后鲁14井、鲁15井水位的气压加卸载响应比，分析了其变化特征。  相似文献