特殊环境条件下某滑坡地质灾害治理方案研究及探讨   总被引：2，自引：0，他引：2  

蒋家龙  刘长平  张正 《安徽地质》2011,(4):288-292

通过桥墩镇滑坡地质灾害工程地质条件及滑坡稳定性分析评价,表明该滑坡在天然状态下处于整体暂时稳定～变形状态,在饱水状态下处于整体变形-滑动状态。为了保证滑坡下方居民生命财产和道路安全运营,本着"安全、环保、有效、经济"的治理原则,选择两种可行方案进行方案比选和治理效果安全系数计算分析,结合滑坡环境条件,推荐采用坡脚抗滑桩支挡坡面锚索墩加固方案。  相似文献   

Organic Matter Accumulation in the Upper Permian Dalong Formation from the Lower Yangtze Region, South China     

FANG Chaogang  ZHANG Chengcheng  MENG Guixi  XU Jinlong  XU Naicen  LI Hualing  LIU Mu  LIU Bo 《《地质学报》英文版》2024,98(1):150-167

The Late Permian was marked by a series of important geological events and widespread organic-rich black shale depositions, acting as important unconventional hydrocarbon source rocks. However, the mechanism of organic matter (OM) enrichment throughout this period is still controversial. Based on geochemical data, the marine redox conditions, paleogeographic and hydrographic environment, primary productivity, volcanism, and terrigenous input during the Late Permian in the Lower Yangtze region have been studied from the Putaoling section, Chaohu, to provide new insights into OM accumulation. Five Phases are distinguished based on the TOC and environmental variations. In Phase I, anoxic conditions driven by water restriction enhanced OM preservation. In Phase II, euxinic and cycling hydrological environments were the two most substantial controlling factors for the massive OM deposition. During Phase III, intensified terrestrial input potentially diluted the OM in sediment and the presence of oxygen in bottom water weakened the preservation condition. Phase IV was characterized by a relatively higher abundance of mercury (Hg) and TOC (peak at 16.98 wt%), indicating that enhanced volcanism potentially stimulated higher productivity and a euxinic environment. In Phase V, extremely lean OM was preserved as a result of terrestrial dilutions and decreasing primary productivity. Phases I, II and IV are characterized as the most prominent OM-rich zones due to the effective interactions of the controlling factors, namely paleogeographic, hydrographic environment, volcanism, and redox conditions.  相似文献   

现阶段如何开展两淮地区煤炭资源勘查中煤层瓦斯勘查工作的建议     

朱文伟  随峰堂  王陈香 《安徽地质》2009,19(1):12-16

煤层瓦斯勘查工作是煤炭资源勘查工作的重要组成部分,作好资源勘查工作中的煤层瓦斯勘查工作,既可为煤矿规划和设计提供地质资料,又可为煤层瓦斯如何开发利用提供依据。本文基于《煤、泥炭地质勘查规范》对资源勘查工作中煤层瓦斯勘查、研究的具体要求,同时结合近期国家出台的相关文件要求,针对我省两淮地区煤层瓦斯赋存的总体状况,提出在两淮地区煤炭资源勘查中如何开展煤层瓦斯勘查工作的建议,为现阶段开展上述工作提供了参考依据。  相似文献   

安徽省铜陵矿集区狮子山岩浆流体系统地球化学测试数据集   总被引：2，自引：2，他引：0       下载免费PDF全文

常印佛  裴荣富  侯增谦  杨竹森 《中国地质》2017,44(S1):49-55

铜陵矿集区是中国最著名的铜、金、铁产地之一,该矿集区内成矿与岩浆作用关系密切。狮子山岩浆流体系统分布最为广泛,是铜陵矿集区岩浆活动与成矿作用的主体,为众多地质学家所重视。狮子山岩浆流体系统地球化学测试数据集包括系统内具有代表性的34件岩石样品主微量元素数据、32件流体包裹体显微测温数据; 5件石英包裹体稀土、微量元素数据; 28件样品C-H-O同位素数据及27件样品的硫同位素测试数据。全部测试均在国家知名测试数据实验室进行,数据质量可靠。该数据集可以反映狮子山岩浆子系统的岩浆活动特征、成矿流体特征、成矿物质来源,为揭示矿床成因、成矿流体来源及演化等科学问题提供数据支撑。  相似文献   

瑞雷面波方法在皖北地区高速公路桥梁勘察中的应用     

蒋家龙  张礼顺  王双六 《安徽地质》2010,20(4):303-305

通过徐州至明光高速公路(安徽段)淮河特大桥场地波速测试,分别采用钻孔孔内单孔波速试验和瑞雷面波试验的方法,获得岩土体弹性波速度,进行划分建筑场地类别、评价地震效应的研究。通过安徽省皖北地区厚层粉土、粉细砂地段,采用瑞雷面波试验方法有效性和可行性分析,表明它是一种简便、快速、准确、高效的经济方法。  相似文献   

Evidence from P-to-S mantle converted waves for a flat “660-km” discontinuity beneath Iceland     

《Earth and Planetary Science Letters》2006,241(1-2):271-280

Iceland is the type example of a ridge-centered hotspot. It is controversial whether the seismic anomaly beneath it originates in the lower mantle or the upper mantle. Some recent studies reported that the 660-km discontinuity beneath central Iceland is shallow relative to peripheral regions and this was interpreted as an effect of elevated temperature at that depth. We investigate topography of the major upper mantle discontinuities by separating the effects of the topography and volumetric velocity heterogeneity in P receiver functions from 55 seismograph stations. Our analysis demonstrates that a significant (at least 10-km) shallowing of the 660-km discontinuity is only possible in the case of improbably low seismic velocities in the mantle transition zone beneath central Iceland. If, as in previous studies, lateral velocity variations in the mantle transition zone are neglected, the data require a depressed rather than an uplifted 660-km discontinuity. For a reasonable S-wave velocity anomaly in the mantle transition zone (around − 3%) no topography on the 660-km discontinuity is required. This can be explained by the lack of temperature anomaly or an effect of two phase transitions with opposite Clapeyron slopes.  相似文献   

Paleoproterozoic Multistage Metamorphic Ages Registered in the Precambrian Basement Rocks at the Southeastern Margin of the North China Craton and Their Geological Implications   总被引：1，自引：0，他引：1  

LIU Yican  WANG Chengcheng  NIE Jiazhen 《《地质学报》英文版》2016,90(6):2265-2266

正Objective The Precambrian basement rocks in the Bengbu and neighboring areas,located at the southeastern margin of the North China Craton,occur as granulite terrains and xenoliths in the Mesozoic dioritic porphyry.They provide an excellent natural laboratory to study the formation and evolution of the Precambrian lower crust in the region.  相似文献   

邹庄井田72煤层岩浆岩侵入规律研究     

周士荣  孟怀安 《安徽地质》2007,17(3):178-181

邹庄井田正处于开发阶段,而岩浆岩侵入煤系地层对煤层煤质有很大的影响,7煤层为邹庄井田的主采煤层.分析了区域构造对岩浆岩的控制作用,研究了岩浆岩侵入72煤层的平面分布及变化规律,探讨了岩浆岩的岩性、侵入方式和成因,对今后邹庄井田的开发有着十分重大的意义.  相似文献   

崩解性砂软岩改良弱膨胀土性状实验研究     

李国维  巩齐齐  李涛  吴建涛  陈伟  曹雪山 《工程地质学报》2021,29(1):34-43

引江济淮河(航)道工程引江济巢段和江淮沟通段地层连续分布弱膨胀土和具有崩解性的砂软岩,为资源化利用河道开挖弃渣开发非膨胀土来源,实验研究利用崩解性软岩改良弱膨胀土的可行性。研究表明:崩解性砂软岩易粉碎、无膨胀性、天然含水率低,具备作为改性材料的条件;弱膨胀土掺入崩解性砂岩后其膨胀率、膨胀力、最优含水率与掺入量负相关,最大干密度、渗透系数与掺入量正相关;弱膨胀土掺入崩解性砂岩后其内摩擦角随掺量呈反S型曲线规律发展,黏聚力随掺量增加近似呈二次曲线规律衰减,掺量高于30%时,改良土的抗剪强度可能低于天然弱膨胀土;在砂岩掺量及粒径范围相同情况下,砂岩粗颗粒含量越高,改良土的黏聚力越高和摩擦角越低;砂岩改良土在干湿循环条件下的强度稳定性得到改善,且水化砂岩的改良效果优于机碎砂岩。以弱膨胀土改良后强度不损失为标准,确定砂岩合理掺量为30%,并须合理控制砂岩改良土施工过程中机碎砂岩中粗粒组的含量。  相似文献   

安徽繁昌地区桃冲铁矿床地球化学特征及矿床成因研究   总被引：2，自引：0，他引：2  

任广利  王核  刘建平  王彪  吴玉峰  黄朝阳 《地学前缘》2012,19(4):82-95

安徽繁昌地区作为长江中下游Fe、Cu、Au成矿带中的重要矿集区,发育一系列以桃冲铁矿为代表的磁铁矿型铁矿床。对桃冲矿区分布的岩浆岩、围岩与赋矿矽卡岩的稀土元素地球化学特征对比,表明三者稀土含量及其配分模式存在差异,桃冲铁矿夕卡岩稀土总量较低,轻稀土富集重稀土亏损,呈右倾过渡型配分模式,具明显Eu正异常。通过对桃冲铁矿床内包裹体的岩相学、显微测温、激光拉曼光谱探针分析,桃冲铁矿体中发育有熔融包裹体、气液相包裹体、含子晶多相包裹体、纯液相包裹体4种类型。成矿流体具中高温、高盐度、富水特征,富含Na+、Ca2+、Mg2+、K+、Cl-、SO2-4离子。结合透岩浆流体成矿理论探讨成矿流体及演化,认为形成铁矿床的物质来源为深部富铁夕卡岩矿浆,侵位过程中受构造环境影响,因温压条件的迅速改变含矿流体与夕卡岩浆发生解耦作用,于构造薄弱部位贯入形成矿体。  相似文献