Development of the emerging electromagnetic methods for deep earth exploration     

Qingyun Di  Guoqiang Xue  Zhongxing Wang  Zhiguo An  Changmin Fu  Ruo Wang  Da Lei  Fayemi Olalekan 《《地质学报》英文版》2018,92(Z1):313-317

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In situ investigation into fracture and subsidence of overburden strata for solid backfill mining     

Tong-bin Zhao  Zhi-yong Fu  Gang Li 《Arabian Journal of Geosciences》2018,11(14):398

Controlling the subsidence of overburden strata is the main objective for backfill mining technology. In order to understand the controlling effect of filling body, a detection scheme with three direction boreholes was designed in the tailgate of T₃290 mining face in Tangshan Coal Mine to monitor the fracture developing process of overburden strata. In addition, a few displacement and stress sensors used for monitoring the roof subsidence and filling body stress were arranged behind the longwall face to monitor and record the force and deformation of gangue. The field investigation shows that the solid backfill mining technology can effectively reduce the fracture of overburden strata, i.e., the fracture height and the damage degree. The subsidence of overburden strata is mainly caused by the subsidence of roof which is divided into four stages: roof subsidence stage of mining face, rapid subsidence stage of gob roof, relatively stable stage, and long-term rheological stage. The gauge plays an essential role in slowing down the subsidence in each stage of the overburden subsidence, especially the relatively stable stage.  相似文献   

Assessment of water inrush risk using the principal component logistic regression model in the Pandao coal mine,China     

Weitao Liu  Qiang Li  Jiyuan Zhao  Biao Fu 《Arabian Journal of Geosciences》2018,11(16):463

In order to improve the accuracy of floor water inrush assessment, the risk prediction model of floor water inrush was established by combining the principal component logistic regression analysis (PCLRA) and GIS spatial geographic analysis. In this paper, the geological data of Pandao coal mine was taken as the engineering background. First of all, main controlling factors of floor water inrush were determined and quantified. Next, PCLRA was used to determine the weight of each factor and establish the mathematical model for predicting the floor water inrush. And then, GIS’s spatial analysis and data processing function was used to draw related single factor thematic maps. Related thematic maps were weighted superposed to draw a floor water inrush zoning map based on PCLRA mathematical model. The study areas were divided into five levels by Jenks optimization method and vulnerability index initial model. And the corresponding threshold range was determined. The results show that (1) the high sensitivity factors in floor failure depth were added to evaluate the water inrush, and the fault fractal dimension was used to replace the fault structure related factors, and the main controlling factors of floor water inrush are more comprehensive; (2) the fitting degree of PCLRA model is high and the test accuracy is 83.3%; (3) the prediction results were well fitted to the actual position of water inrush (three water inrush points are located in the dangerous area, and two water inrush points are located in the relatively dangerous area).  相似文献   

Experimental study of the mechanical properties of expansive soil with added nanomaterials     

Yanliang Shang  Yingchun Fu 《Arabian Journal of Geosciences》2018,11(8):180

The main purpose of this paper is to describe ways to improve the microstructure of expansive soil by adding nanomaterials. Mechanical tests were done to explore the changes in shear strength and compression index of expansive soil that was modified by adding different amounts of two kinds of nanomaterials (nano-alumina and nano-silica). The test results show that adding 1.2% nano-alumina and about 2% nano-silica to expansive soil provides the optimal compression index. The test results show that adding 1.2% nano-alumina and about 1.5% nano-silica to expansive soil provides the optimal unconfined compression stress. Scanning electron microscopy of the microstructure of expansive soil modified by nanomaterials provided a deeper understanding of the effects of nanomaterials on improving expansive soil.  相似文献   

Correction to: Assessing real options in urban surface water flood risk management under climate change     

Haixing Liu  Yuntao Wang  Chi Zhang  Albert S. Chen  Guangtao Fu 《Natural Hazards》2018,92(1):19-25

Windblown dust originating in China and Mongolia causes health effects and agricultural damage in its source areas and causes Asian dust events in Japan. An early warning system that could be combined with weather forecasts would be helpful in preventing serious damage. However, it is difficult to specify source areas of dust with current dust modeling systems because land surface information, including vegetation coverage and land surface soil water content, is inadequate. To find and monitor dust source regions, a semi-real-time dust erodibility map was developed based on MODIS satellite data that focuses particularly on the threshold wind speed in a target area of northeast Asia including China and Mongolia (35°–50°N, 75°–120°E). The mapping system incorporates satellite data on snow cover, areas of frozen soil, surface soil water content, and vegetation cover.  相似文献   

Comparative analysis of significant wave height between a new Southern Ocean buoy and satellite altimeter          下载免费PDF全文

Jianjun Kang  Runyu Mao  Yiting Chang  Hongli Fu 《大气和海洋科学快报》2021,14(5):49-55

中国于2019年第35次南极考察中,首次在南大洋布放了锚系实时综合观测浮标(西风带海洋环境监测浮标,WEMB),为深入了解此海区的海洋环境变化提供了宝贵资料.国家海洋技术中心WEMB研究团队基于AVISO公开发布的多颗卫星高度计L3产品,通过数据配对,误差统计和最小二乘线性拟合等方法,对西风带海洋环境监测浮标的有效波高数据误差进行了分析与校正.校正后的浮标有效波高统计显示西风带常年处于大浪以上海况,观测期间内57％处于巨浪海况,并且伴随有高度相关的大风天气.  相似文献   

黄骅坳陷古生界潜山储层沥青成因判识     

王鑫  周立宏  金凤鸣  付立新  楼达 《地质论评》2021,67(Z1):67z1123-67z1124

正黄骅坳陷古生界潜山是大港油田重要的油气勘探领域,近年来,先后在王官屯、乌马营潜山古生界发现油气流,且均为石炭—二叠系煤系源岩供烃成藏,如王官屯潜山王古1井二叠系石盒子组发现天然气,同位素特征判断为煤成天然气。这些发现拓展了古生界潜山的勘探领域,表明了石炭—二叠系煤系烃源岩的油气充注范围不仅仅局限于奥陶系碳酸盐岩储层,石炭—二叠系的碎屑岩储层也可以充注成藏,证实了古生界潜山具有更大的油气勘探价值。随着勘探进程与理论认识的不断深化,  相似文献   

Study on Monitoring Technology of Surrounding Rock in Deep Layered Roadway Based on Constant Resistance and Large Deformation Bolt     

Hou  Dinggui  Zheng  Xinyu  Fu  Xu 《Geotechnical and Geological Engineering》2021,39(5):3903-3916

Geotechnical and Geological Engineering - The stability monitoring of surrounding rock in layered roadway is an important method to ensure the safety of deep mining coal mine. In view of the actual...  相似文献   

基于F-MCDM的冰川旅游游客满意度综合评价及敏感性分析     

唐凡  杨建平  贺青山  陈虹举  黄仕海  张伏  王彦霞  葛秋伶 《冰川冻土》2021,43(5):1571-1581

游客满意度是衡量旅游地竞争力的关键因素之一,已受到众多旅游研究者的关注。在其热点研究中,有关冰川旅游游客满意度及不同游客属性间满意度差异的研究鲜见。选取达古冰川与海螺沟冰川为研究区,通过对游客属性细分,运用模糊多准则决策法（F-MCDM）及引入需求弹性理论对冰川旅游游客满意度进行了综合评价和敏感性分析,探讨了提升冰川旅游游客满意度的对策建议。结果表明：达古冰川游客实际满意度总体高于海螺沟冰川,两地均以管理与服务的满意度最高,消费状况与交通的满意度最低。就游客属性的相对满意度而言,两地均呈现男性满意度高于女性,高消费游客满意度高于低消费游客,高忠诚度游客满意度高于低忠诚度游客;两地相对满意度的差异表现在年龄、受教育程度、客源地和到访次数方面。相较于达古冰川,海螺沟冰川满意度敏感性更高,同等改进力度下游客满意度的提高更为明显高效,就两地满意度敏感性最高的景观特色而言,达古冰川1%的改善将提升游客满意度0.30%,而海螺沟冰川可提升0.45%;对于不同游客属性的满意度敏感性,两地均以不愿推荐、不愿重游和未达到期望的游客最高。最后依据满意度敏感性分析结果,为两地冰川旅游发展提出了关键属性改进、营销策略创新和旅游产品开发等针对性建议。  相似文献   

共和盆地壳内部分熔融层存在的地球物理证据与干热岩资源区域性热源分析          下载免费PDF全文

张森琦  李旭峰  宋健  文冬光  李志伟  黎敦朋  程正璞  付雷  张林友  冯庆达  杨涛  牛兆轩 《地球科学》2021,46(4):1416-1436

新生代以来,共和盆地及其周缘造山带无火山、岩浆活动,印支期隐伏花岗岩体岩浆余热与放射性元素衰变生热等难以构成共和盆地干热岩资源的主要热源,而共和盆地又为一高温地热异常盆地.目前已基本探明了共和县恰卜恰与贵德县热水泉干热岩体2处,圈定出干热岩勘查目标靶区16处.区域重力和区域航磁调查、区域天然地震成像、盆地尺度天然地震背景噪声层析成像勘查,以及超高分辨率重力异常、电阻率与Rayleigh波群相速度线性反演结果均表明共和盆地下伏发育有壳内部分熔融层,进而构成地处板内环境、高热流区共和盆地干热岩资源的区域性热源.盆地尺度MT勘查结果表明,共和盆地西盆地壳内部分熔融层埋深15~35 km,东西向长约41 km,南北向宽约34 km,厚度2~12 km.综合分析认为,该部分熔融层熔融程度最高可达4%~7%,15 km深处温度约为574℃,主体位于贵南南山推覆体系与共和准推覆体系深部主拆离滑脱推覆界面之下,兴海大型复合推覆体系主拆离滑脱推覆界面之上.挽近地质时期深构相、多层次、近水平展布的韧性拆离滑脱推覆构造界面的连续动态剪切摩擦生热,可能是部分熔融层形成的主要因素.   相似文献