Investigation on mining-induced fractured zone height developed in different layers above Jurassic coal seam in western China

The mining-induced fractured zone height (MIFZH) is of significant importance for water hazard prevention and regional eco-environmental conservation in the Jurassic coal field of western China. The paper discussed MIFZH developed in bedrock and Neogene laterite from two aspects of field measurement and theoretical analysis respectively. In theoretical analysis of MIFZH developed in bedrock, based on plate and shell theory, each stratum in bedrock above the coalface stress-decreasing zone was simplified as four clamped rectangular plates, and the value of the ultimate deflection of the thin plate and the height of the free space in the lower part of the stratum were compared to judge MIFZH. When MIFZH was developed in Neogene laterite, MIFZH was calculated by Pu’s theory and rock mass limit equilibrium theory in theoretical analysis; in on-site measurement, micro resistivity scanning imaging logging technology (MRSILT), overcoming the shortage of fluid leakage technology, was adopted to detect MIFZH, where its measured result proved the feasibility of theoretical analysis. The research results have important significance to water conservation mining and safety mining of the Jurassic coal seam in western China.     

Cenozoic Denudation and Vertical Faulting History of the Central Segment of the Longmenshan Thrust Belt

正Objective The uplift process and uplift mechanism of the Tibetan Plateau has been a research focus among geologists in recent years.This work put emphasis on the Cenozoic exhumation histories of the blocks bounded by the major faults at the central segment of the Longmenshan thrust belt,and the vertical faulting history,including the starting     

上海城市地质工作深化服务领域及机制

结合上海的城市功能定位与发展建设规划,提出了上海城市地质工作深化服务的主要领域与工作重点,探讨了建立和完善与之相适应的管理工作机制以及具体保障措施。     

四川攀枝花盐边地区新发现142万t大型晶质石墨矿

1 研究目的(Objective) 在开展1:5万区域地质调查工作基础上,系统查明区内地层、岩石、构造特征和成矿地质条件,围绕扬子陆块西缘攀枝花地区田坪、南阳等已有的典型石墨矿床开展石墨矿成矿背景调查研究工作,发现新的石墨矿化线索,助推形成攀枝花大型晶质石墨矿资源基地.     

小秦岭与胶东金矿床的成矿流体特征对比

小秦岭和胶东地区夺型金矿床的矿化类型和成矿流体的包裹体，稳定同位素特征和有很多相似之处，但也有些区别。小秦岭矿床的流体包裹体具更高的ＣＯ２／Ｈ２Ｏ，较高的Ｋ＾＋／Ｎａ＾＋和Ｆ＾－／Ｃｌ＾－，这与该区的成矿压力较高，容矿主岩以相对贫Ｋ＾＋，Ｆ＾－的斜长角闪岩和灰色片麻岩类有关。     

福建宁德三都澳的沉降与冲淤探讨

宁德三都澳位于福建省东部沿海,口小腹大水深,为中国乃至世界罕见天然良港,阐述全新世以来,三都澳的地壳沉降规律、新构造运动特征,分析三都澳在全新世（1万年）以来,以及全新世晚期（三千多年）来,澳内沉降速率,淤积物等情况,认为三都澳成为世界性良港原因,是地壳沉降作用整体大于澳内淤积物。     

滇西梁河地区钾长花岗岩锆石LA-ICP-MS U-Pb定年及其地质意义

在详细区域地质调查的基础上,对滇西梁河地区具有代表性的两件钾长花岗岩样品中的锆石进行了阴极发光图像、微区原位LA-ICP-MS微量元素分析和U-Pb定年。结果表明,梁河地区钾长花岗岩锆石显示振荡环带的内部结构,指示其岩浆成因;两件样品的锆石具有较高的Th、U含量,稀土元素总量较高,轻稀土亏损、重稀土富集,明显的的Ce正异常和Eu负异常的稀土配分模式,说明其壳源岩浆锆石特征;两件样品的锆石206Pb/238U加权平均年龄分别是(60.7±0.6)Ma和(115.8±1.0)Ma,属古新世和早白垩世花岗岩。结合区域地质特征,腾冲地块在中生代晚期-新生代早期发生多期岩浆作用,揭示滇西三江地区特提斯演化的岩浆响应,为青藏高原东缘地区地质演化的动力过程提供约束。     

滇西梁河龙塘花岗岩体LA-ICP-MS锆石U-Pb年代学及其构造意义

为了查明出露于滇西梁河县的龙塘二长花岗岩体的形成时代和构造背景,对其进行了锫石LA-ICP-MS U-Pb定年和岩石地球化学研究.结果显示:该花岗岩的锆石具有清晰的生长振荡环带,其Th/U值为0.11 ～1.79,属于典型的岩浆成因锆石.锆石的15个测点206pb/238U加权平均年龄为(232.1±5.6) Ma (...     

基于滑楔连接的新型填充墙设计与抗震性能数值模拟

为了减轻填充墙与框架在地震中的不利相互作用,提出一种采用滑楔连接件的柔性填充墙框架结构设计方案.采用ABAQUS建立滑楔连接框填结构有限元模型,与满砌填充墙在平面内滞回性能、平面内外耦合性能、墙框局部损伤及填充墙整体损伤等方面进行了对比分析.模拟结果表明,和满砌填充墙相比,采用滑楔连接减轻了填充墙与框架平面内相互作用产...     

基于视知觉金字塔模型的专题地图视觉层次设计

专题地图往往需要表达制图专题的空间分布特征、数量特征、时间变化特征等多层次的内容,故清晰的视觉层次对专题地图的信息表达至关重要.将视知觉金字塔模型和视觉选择性原理与专题地图的内容层次和图面表达视觉层次进行耦合,建立了"内容层次设计-视觉注意-视觉变量设计"的理论框架.在此基础上,以《深圳市历史风貌区和历史建筑》专题地图...