Study of blasting vibrations in Sarcheshmeh copper mine   总被引：1，自引：0，他引：1  

K. Najm) A. Javaherian) H. B. Amnieh) ) Department of Mining  Metallurgy  Petroleum Engineering  Amirkabir University  Tehran  I R Iran ) Institute of Geophysics  Tehran University  Tehran  I R Iran 《地震学报(英文版)》2002,15(6):683-690

Introduction In spite of development of mechanized methods of ground excavation, drilling and blasting is still extensively employed because of its low capital investment and simplicity. Its extensive use is not even limited by extension of mines close to residential areas and vital establishments. If it is not used in a controlled way, blasting operation can cause instability, failure of mine slopes and damps and damage to the nearby structures. The main objective here could be to reduce the …  相似文献   

ABNORMAL GEOMAGNETIC FIELD RESPONSE AT INTRAPLATE TECTONIC BOUNDARY IN CONTINENT AND CONTINENTAL MARGIN IN SOUTHEASTERN CHINA   总被引：6，自引：0，他引：6  

TENG Jiwen*  YAN Yafen 《大地构造与成矿学(英文版)》2004,28(2):93-117

South China landmass is located at the southeastern end of Eurasia, adjoining Qinghai-TibetPlateau in the west, bordering Qinling-Dabie orogen in the north and the West Pacific in the east, andbeing connected to South China Sea in the south, hence the topography landscape shows transition froman inland type to a continental marginal type. Ever since Late Achaeozoic to Early Proterozoic,Cathaysia and Yangtze blocks has undergone multiple stages of splitting and amalgamation, and did notfi…  相似文献   

SPATIAL CORRELATION ANALYSIS BETWEEN KARST ROCKY DESERTIFICATION AND LITHOLOGY IN DU‘AN YAO AUTONOMOUS COUNTY IN GUANGXI   总被引：1，自引：0，他引：1  

HU Baoqing  *  JIANG Shufang  LIAO Chimei  HUANG Qiuyan  ZHOU Dequan 《大地构造与成矿学(英文版)》2004,(2):157-167

Karst rocky desertification refers to soil degeneration process such as serious erosion of soils,exposure of basement rocks in great areas, dramatic decrease in soil productivity, and occurrence oflandscapes similar to harsh deserts on ground surface, etc. under vulnerable environmental backgroundtypical of karst in subtropical areas, due to interferences and destruction resulted from the unreasonablesocial and economical activities by human beings (Wang, 2002). As a matter of fact, it was res…  相似文献   

GEOCHEMISTRY AND TECTONIC ENVIRONMENT AND RESERVOIR FORMATION OF MANTLE-DERIVED NATURAL GAS IN THE SONGLIAO BASIN, NORTHEASTERN CHINA   总被引：1，自引：0，他引：1  

LI Zian*  GUO Zhanqian  BAI Zhenguo    LIN Ge 《大地构造与成矿学(英文版)》2004,28(2):168-182

During several decades of exploration, a number of mantle-derived natural gas pools have been discovered in the vicinities of deep faults in the Songliao Basin, northeastern China. The natural gas in these pools has a δ 13C1 value of-16.5‰ to -24.2‰, a reversed arrangement in the amount of carbon isotopes in methane and its endogamous products (namely, Δ13c1 ＞Δ13c2 ＞Δ13c3 ＞Δ13c4 ), a 3He/4He value of 1.97 to 2.34× 10-6, and an 40Ar/36Ar value of 1063 to 1949. This indicates a mantle source for the natural gas. The trace elements Cd, In, Te and Re, never found in organic-sourced hydrocarbons, are highly enriched in certain crude oils from the Basin; respectively, concentrations of these elements were found to be 751, 28, 16 and 323 times the average crustal values in China, and this also supports a mantle-derived natural gas origin. The characteristics of mantled-derived magmatic rocks,hydrothermal fluids and gaseous fractions distributed in and near the deep Songliao Basin faults indicate that rifting tectonics is providing the mechanisms for this outgassing of the mantle. Deep extensional(normal) faults provide pathways for upward movement of these materials, and in the Songliao Basin,these deep riff fault zones are associated with reservoir occurrence and cap rock seals, forming good sites for accumulation of mantle-derived natural gas. Furthermore, a layer of low velocity, low density and high conductivity in the deep crust has been identified as a potential reservoir for mantle-derived natural gas.  相似文献   

Study on Soil and Water Loss Characteristic of the Railway Construction in Mountain Area     

BAI Ming-zhou~  XU Zhao-yi~  HUO Yu-hua~  DONG Yong~ 《地球科学进展》2004,(Z1)

The factor of human project activity is often the immediate cause resulting in soil and water loss. The Baoji-Lanzhou second railway in construction is an example. The soil and water loss law caused by earth and stone mountain railway engineering construction in the northwestern China is studied systematically and that caused possibly by the road bed project, the road moat project, the field project, the tunnel project and the service road project in construction is probed. At the same time, the type, the intensity and influencing factor of soil and water loss in the northwest mountain railway construction are also studied.  相似文献   

Study on the Safety of the Rock Mass in the Tongling Bank of Taipinghu Bridge     

DUAN Hai-peng~ 《地球科学进展》2004,(Z1)

The Taipinghu Bridge is an important engineering construction, and the safety of rock mass of its foundation is very crucial. This article adopts FLAC 3D to analysis the geologic model. The simulating process shows that no mater the excavating process or the loading process the rock mass are safe. The modeling and analyzing process can be used for reference.  相似文献   

Degradation of Microbes for the Crude Oil Contaminants     

LIU Xiao-yan  SHI Peng-fei  SUN De-zhi 《地球科学进展》2004,(Z1)

Production and storage-transportation of crude oil can not only give rise to soil pollution but also destroy ecological environment. Degradation of microbes for oily soil was studied with the instnunent, Geofina Hydrocarbon Meter (GHM), by experimental analysis qualitatively and quantitatively in the paper. Analytical result showed that the crude oil could be considerably degraded by eating-oil microbes in oily soil and the number of eating-oil microbes increased while the working hours of oil-well rising. As a result, contaminated oil could be degraded more quickly by a lot of eating-oil microbes in the soil. At the same time, the degradation rate of contaminated oil increased gradually as the time went on. In addition, amount of gaseous component in the oily soil samples increased with degraded time and the microbes could selectively consume contaminated oil strongly, so biedegradation might alleviate the degree of contamination and destruction to the soil and environment in the process of oil product  相似文献   

利用数值预告产品及卫星云图综合分析做台风预报     

叶子祥  谢亮  应文 《浙江气象》1993,(1)

长期以来,对于热带气旋,热带风暴、台风(以下统称为台风)的预报,地市气象台一般是以预报员的经验预报作为主要依据。八十年代后期开始,数值预报、统计相似等客观预报方法已取得显著的进展。但是,这些方法一般仍只作为预报值班员的参考。对于数值预告产品的综合分析及近几年发展起来的地市气象台数字化卫星云图的分析预报方法研究不多。温州市气象台在1990年以来,已初步形成一套利用数值预告产品及卫星云图综合分析做台风预报的思路。本文结合1992年15、16、19号三个台风的预报分析作具体说明。  相似文献   

Active　Northern　Huashan　Piedmont　Fault　Zone　and　Geological　Hazard　in　Shaanxi　Province     

Hou Jianjun  Han Mukang  Bai Taixu 《中国地质大学学报(英文版)》1994,(1)

ＡｃｔｉｖｅＮｏｒｔｈｅｒｎＨｕａｓｈａｎＰｉｅｄｍｏｎｔＦａｕｌｔＺｏｎｅａｎｄＧｅｏｌｏｇｉｃａｌＨａｚａｒｄｉｎＳｈａａｎｘｉＰｒｏｖｉｎｃｅ￥ＨｏｕＪｉａｎｊｕｎ；ＨａｎＭｕｋａｎｇ；ＢａｉＴａｉｘｕ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｐ，Ｐ...  相似文献   

Geometric and Dynamical Characteristics of Sequences in Yitong Graben     

Xie Xinong  Sun Yongchuan 《中国地质大学学报(英文版)》1994,(1)

ＧｅｏｍｅｔｒｉｃａｎｄＤｙｎａｍｉｃａｌＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＳｅｑｕｅｎｃｅｓｉｎＹｉｔｏｎｇＧｒａｂｅｎ￥ＸｉｅＸｉｎｏｎｇ；ＳｕｎＹｏｎｇｃｈｕａｎ（ＤｅｐａｒｍｅｎｔｏｆＭｉｎｅｒａｌＲｅｓｏｕｒｃｅｓ，ＣｈｉｎａＵｎｉｖｅｒｓ...  相似文献