Ground-based phase wind-up and its application in yaw angle determination     

M. Cai  W. Chen  D. Dong  C. Yu  Z. Zheng  F. Zhou  M. Wang  W. Yue 《Journal of Geodesy》2016,90(8):757-772

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A Further Study on Wave Propagation Across a Single Joint with Different Roughness     

X. Chen  Jian Chun Li  M. F. Cai  Y. Zou  J. Zhao 《Rock Mechanics and Rock Engineering》2016,49(7):2701-2709

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The Blasting Test and Blasting Vibration Monitoring of Vertical Crater Retreat Mining Method in the Luohe Iron Mine     

Zhenbin Rao  Sijing Cai 《Geotechnical and Geological Engineering》2016,34(4):1047-1056

Because the land requisition and demolishing became difficult more and more, the mining scheme of Luohe iron mine was changed from caving method to filling method. In order to ensure the safety of the residence and the underground tunnel cavern within the mobile belt of the underground mining, the Luohe iron mine did the blasting test on the vertical crater retreat mining method and blasting vibration monitoring. The blasting experiments use common emulsified oil explosives and non-electric initiation system. The way of caved ore adopts the cutting groove and bench side. The NUBOX-6016 intelligent vibration monitor was chosen in the blasting vibration monitoring. Twice experiments on the blasting vibration monitoring were done on the surface or in the underground refuge cavern. The first test select the three monitoring points on the ground and the second select two monitoring points on the ground and a monitoring point in the underground refuge cavern. The blasting vibration monitoring data were conducted by the regression analysis in the Sodev’s empirical formula. The vibration attenuation formula about the underground blasting vibration transmitting in three directions is derived. The blasting test on the vertical crater retreat mining method and the blasting vibration were analyzed. It is estimated if the vibration damage possibly the surface buildings and related facilities of mine.  相似文献   

塔河油田海西早期岩溶古水系识别方法及其特征     

李源  蔡忠贤  张恒  鲁新便  刘永立 《地质科技情报》2016,(4):184-191

塔河油田海西早期形成了复杂的碳酸盐岩岩溶缝洞系统,其发育规模在东部地区和西部地区表现出显著的差异性。岩溶水作为岩溶发育的关键因素,在不同地质背景下表现出的水文学特征及水动力作用与岩溶缝洞系统的发育密切相关。为了深入认识和阐述岩溶储层发育机制,基于三维地震资料,通过地震属性技术结合现代岩溶理论成果恢复了塔河油田埋深5 000m以下的古水文网络,精细描述了水系发育特征。研究结果表明:东部地区地表水系统具有较大汇水量,水系以强烈的垂向侵蚀作用为主,发育了完整的地表-地下双重水系型水文网络系统;西部地区地表水以水平溶蚀作用为主,地貌较为平缓,尚未产生大型地下水系网络系统,属于地表水系型水文网络系统。东、西部地区地表、地下水文系统动力学机制的不同,为这2个地区岩溶储层发育的差异性提供了合理解释。  相似文献   

Tin partition behavior and implications for the Furong tin ore formation associated with peralkaline intrusive granite in Hunan Province,China     

Xiaoyan Hu  Xianwu Bi  Ruizhong Hu  Guosheng Cai  Youwei Chen 《中国地球化学学报》2016,35(2):138-147

Tin deposits are often closely associated with granitic intrusions. In this study, we analyzed tin partition coefficients between different fluids and melts (\({\text{D}}_{Sn}^{aq.fl./melt}\)) as well as various crystals and melts \({\text{D}}_{Sn}^{aq.fl./melt}\)(\({\text{D}}_{Sn}^{crystal/melt}\)) from the Furong tin deposit associated with the Qitianling A-type granite. Our experimental results indicate that tin partition behavior is affected by the chemical compositions of fluids, melts, and minerals. Tin is prone to partitioning into the residual magma in fractional crystallization or other differential magmatic processes if the magma originated from crustal sources with high alkali content, high volatile content, and low oxygen fugacity. Highly evolved residual peralkaline granitic magma enriched in tin can lead to tin mineralization in a later stage. Furthermore, the volatiles F and Cl in the magma play important roles in tin partitioning behavior. Low F contents in the melt phase and high Cl content in the aqueous fluid phase are favorable factors for tin partitioning in the aqueous fluid phase. High Cl content in the aqueous fluid catalyzes water–rock interaction and leads to the extraction of tin from tin-bearing minerals. All these findings support a hydrothermal origin for the tin deposits. In light of the geotectonic setting, petrochemical characteristics, and mineralizing physicochemical conditions of the Furong tin deposit, it is inferred that the ore-forming fluid of the Furong tin ore deposit could have derived from the Qitianling peralkaline intrusion.  相似文献   

Mechanical characteristics of dip basement effects on dump stability in the Shengli open pit mine in Inner Mongolia,China     

Liu Han  Jisen Shu  Qingxiang Cai  Hongwen Jing  Hua Tian 《Arabian Journal of Geosciences》2016,9(20):750

For waste dump slopes that form basements, landslides can be prevented by determining a stability evolving law of dynamic development. Keeping this issue in mind, the relationship between the mechanical structure and stability of waste dumps with basements is studied. Three key factors that influence waste dump stability are presented, and judgment criteria for self-locking and unlocking states of dump basements are provided. From the friction coefficient of waste dump basement stability analyses of the Shengli open pit mine, the results indicate that waste dump basements on the right side of fault F8 and on the left side of fault F61 are subjected to self-locking. However, between faults F61 and F8, the basement is subjected to unlocking. Regarding the residual thrusting of unlocking areas, structure and stability optimization schemes for waste dumps in the Shengli open pit mine are provided through a mechanics analysis. Reducing the slopes and basement angles of waste dumps can enhance their stability by increasing basement roughness levels.  相似文献   

Snow disaster characteristics in Palongzangbu River Basin and mitigation countermeasures for road engineering     

ShuSu Duan  LingKan Yao  XiaoDan Sun  Qiang Cai 《寒旱区科学》2016,8(2):95-102

The Palongzangbu River Basin contains the highest number of maritime province glaciers in China.There are 130 glacial lakes,64 snow avalanche sites and 28 glacial debris flow gullies distributed within the basin.Snow disasters play a controlling role in the Sichuan-Tibet Highway construction,due to the terrain's special characteristics of high altitude and large height differential.Segmentation mitigation countermeasures for the Sichuan-Tibet Highway are presented based on snow disaster severity level and damage mode of the road.In the Ranwu to Midui section,snow avalanches are regional disasters, so the line should be placed in sunny slopes.In the Midui Gully to Yupu section,the line should be placed in shady slopes and at higher elevations to reduce the risk of glacial lake outburst.In the Yupu to Guxiang section,all three snow disasters are minimal.In the Guxiang to Tongmai section,glacier debris flows are the major threat,thus the road should be placed in shady slopes.  相似文献   

Influence of urban expansion on the urban heat island effect in Shanghai   总被引：1，自引：0，他引：1  

Meiyan Zhao  Hongyan Cai  Zhi Qiao 《International journal of geographical information science》2016,30(12):2421-2441

The urban heat island (UHI) effect resulting from rapid urbanization is attracting increasing attention among the global scientific community. This research analyzed the relationship between urban expansion and the UHI effect utilizing an integrated approach, including urban land interpretation and retrieving land surface temperature based on remote sensing, and spatial overlay analysis for revealing the relationship for different time periods between 1984 and 2014 in Shanghai, China. The results show that (1) the spatiotemporal changes in UHI are consistent with the expansion of urban land, and rapid urban expansion leads to an expansion of the UHI, in particular along roadways. (2) The mode of urban expansion is an important factor influencing the UHI effect. Urban sprawl (urban expansion in the edge-expansion way) is a form of typical expansion that leads to the rapid increase in the UHI. When the urban compactness ratio is less than 0.15, a compact design can effectively control the expansion rate of the UHI and mitigate its range of influence and intensity. However, when the urban compactness ratio is greater than 0.15, the urban design has a marked influence on the UHI ratio index: a more compact form produces a stronger UHI effect. So, finding an equilibrium between urban compactness ratio and urban expansion rate is good for effective urban management and planning.  相似文献   

The characteristics of rill development and their effects on runoff and sediment yield under different slope gradients   总被引：8，自引：0，他引：8  

Ji-jun He  Li-ying Sun  Hui-li Gong  Qiang-guo Cai  Li-Juan Jia 《山地科学学报》2016,13(3):397-404

Rill formation is the predominant erosion process in slope land in the Loess Plateau, China. This study was conducted to investigate rill erosion characteristics and their effects on runoff and sediment yielding processes under different slope gradients at a rate of 10°, 15°, 20° and 25° with rainfall intensity of 1.5 mm min-1 in a laboratory setting. Results revealed that mean rill depth and rill density has a positive interrelation to the slope gradient. To the contrary, width-depth ratio and distance of the longest rill to the top of the slope negatively related to slope gradient. All these suggested that increasing slope steepness could enhance rill headward erosion, vertical erosion and the fragmentation of the slope surface. Furthermore,total erosion tended to approach a stable maximum value with increasing slope, which implied that there is probably a threshold slope gradient where soil erosion begins to weaken. At the same time, the correlation analysis showed that there was a close connection between slope gradient and the variousindices of soil erosion: the correlation coefficients of slope gradient with maximal rill depth, number of rills and the distance of the longest rill from the top of the slope were 0.98, 0.97 and-0.98, respectively,indicating that slope gradient is the major factor of affecting the development of rills. Furthermore,runoff was not sensitive to slope gradient and rill formation in this study. Sediment concentration,however, is positively related to slope gradient and rill formation, the sediment concentrations increased rapidly after rill initiation, especially. These results may be essential for soil loss prediction.  相似文献   

西藏改则县多不扎地区上侏罗统对望山组的建立及意义   总被引：1，自引：0，他引：1  

董宇超  李才  王明  范建军  吴浩 《地质通报》2016,35(8):1263-1270

对望山组是发育在羌南板块南缘的一套岩石组合,以安山岩、流纹岩、玄武质凝灰岩为主,有少量的玄武安山岩夹层,具有明显的岩浆喷出相和沉积相韵律分布的特点。利用LA-ICP-MS同位素定年技术对对望山组安山岩中的锆石进行了U-Pb同位素测年,获得锆石的~(206)Pb/~(238)U年龄加权平均值为150.5±0.6Ma,表明对望山组的形成时代为晚侏罗世中晚期,在详细剖面测制和区域对比的基础上建立了对望山组。对望山组的建立对完善班公湖-怒江缝合带的地层系统、探讨班公湖-怒江洋的晚侏罗世构造演化具有重要的地质意义。  相似文献