岩溶塌陷灾害的岩溶地下水气压力监测技术及应用   总被引：3，自引：3，他引：0  

蒋小珍  雷明堂 《中国岩溶》2018,37(5):786-791

文章系统、全面地介绍了岩溶地下水气压力监测技术及其应用成果。该技术在监测成孔、孔口的密封及监测频率等方面创新性地提出了相关的工艺方法,能真实、及时且充分地反映出岩溶管道裂隙系统中的地下水气压力变化特点,可为岩溶塌陷的机理研究、监测和预警提供科学依据。岩溶地下水气压力监测技术工艺简单、操作方便、成本低廉,经过20多年的改进,已成功应用于全国11个典型岩溶塌陷区,服务于高铁、水源地、油气管线、市政建设等潜在岩溶塌陷风险性评价、安全降深、监测预警等方面,取得了很好的效果。   相似文献   

基于短波红外技术的蚀变矿物特征及勘查模型——以斯弄多银铅锌矿床为例   总被引：4，自引：1，他引：3  

郭娜  刘栋  唐菊兴  郑龙  黄一入  史维鑫  伏媛  唐楠  王成 《矿床地质》2018,37(3):556-570

印度-亚洲大陆的碰撞成就了青藏高原的冈底斯成矿带,位于该成矿带的斯弄多银铅锌矿床赋存于林子宗群火山岩中,经过勘查确认该矿床属于低硫化浅成低温热液型矿床。通过对5个钻孔进行短波红外测量,发现钻孔中的蚀变矿物主要有绢(白)云母、钠云母(富Na云母)、伊利石和蒙脱石,并在垂向形成绢(白)云母→绢(白)云母+钠云母+蒙脱石+伊利石→绢(白)云母+伊利石→绢(白)云母的组合特征。通过总结归纳蚀变矿物分布、分带特征并与地质编录相结合,构建了基于短波红外技术的斯弄多找矿勘查模型。笔者在数据分析与模型构建中发现:(1)伊利石-蒙脱石混合矿物组成是寻找深部及外围矿体的重要线索;(2)绢(白)云母属于成矿前期的蚀变,与矿体之间的关系不明显;(3)矿床深部表现为两种不同的化学反应:SW方向深部反映了绢云母被交代形成伊利石的过程;NE方向深部表现为绢(白)云母二八面体结构的变化;(4)未被剥蚀的青磐岩化带是寻找浅成低温热液型金矿的主要依据。  相似文献   

A note on the consolidation settlement of a rigid circular foundation on a poroelastic halfspace          下载免费PDF全文

Jueun Kim  A.P.S. Selvadurai 《国际地质力学数值与分析法杂志》2016,40(14):2003-2016

This paper uses Biot's poroelasticity approach to examine the consolidation behaviour of a rigid foundation with a frictionless base in contact with a poroelastic halfspace. The mathematical development of the mixed boundary value problem involves a set of dual integral equations in the Laplace transform domain which cannot be conveniently solved by employing conventional procedures. In this paper, a numerical solution is developed using a scheme where the contact normal stress is approximated by a discretized equivalent. The influence of limiting drainage boundary conditions at the entire surface of the halfspace on the degree of consolidation of the rigid circular foundation is investigated. The results obtained in this study are compared with the corresponding results given in the literature. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

The role of eddies in solute transport and recovery in rock fractures: Implication for groundwater remediation          下载免费PDF全文

Seung Hyun Lee  In Wook Yeo  Kang‐Kun Lee  Won Sang Lee 《水文研究》2017,31(20):3580-3587

A better understanding of solute transport and retention mechanism in rock fractures has been challenging due to difficulty in their direct observations in microscale rough‐walled fractures. Six representative troughs in a rough‐walled fracture were selected for microscale observations of eddy formation with increasing flow velocity and its effect on spatiotemporal changes of solute concentration. This experimental study was enabled by a microscale visualization technique of micro particle image velocimetry. With increasing flow velocity (Re ≤ 2.86), no eddies were generated, and solutes along the main streamlines transported rapidly, whereas those near the wall moved slowly. A larger amount of solutes remained trapped at all troughs at Re = 2.86 than Re < 1. For Re = 8.57, weak eddies started to be developed at the troughs on the lee side, which little contributed to overall solute flushing in the fracture. Accordingly, a large of amount of water was needed for solute flushing. The flow condition of 1 < Re < 10, before a full development of eddies, was least favourable in terms of time and amount of remediation fluid required to reach a target concentration. After large eddies were fully developed at troughs on the lee side for Re = 17.13, solutes were substantially reduced by eddies with less amount of water. Fully developed eddies were found to enhance solute transport and recovery, as opposed to a general consensus that eddies trap and delay solutes. Direct inflow into troughs on the stoss side also made a great contribution to solute flushing out of the troughs. This study indicates that fully developed eddies or strong inflows at troughs are highly possible to form for Re > 10 and this flow range could be favourable for efficient remediation.  相似文献   

泡沫塑料吸附测金中无臭灰化技术的改进     

郭玉生 《铀矿地质》1989,5(1):51-52

根据泡沫塑料(简称泡塑)吸附测金的无臭灰化技术的机理,作者采用了3ml圆底瓷坩埚灰化,解决了大批量佯品的灰化问题和电极装样困难的问题,并节省了灰化用的滤纸。  相似文献   

位场DFT算法研究   总被引：5，自引：0，他引：5       下载免费PDF全文

柴玉璞 《地球物理学报》1988,31(2):211-224

本文推广了经典的抽样定理,并据此导出了函数有限离散傅里叶变换误差方程（简称DFT误差方程,下同）。该方程把有限离散傅里叶变换中固有的离散效应和有限效应表示为确切的数学形式。离散效应被表示为一个含整参变量（参变量取0,1,…,N-1）的复无穷级数;有限效应被表示为一个含整参变量（参变量取0,1,…,N-1）的复无穷级数的DFT。 基于DFT误差方程和位函数特点,作者提出了两种位场数值傅里叶变换新算法--移样法和等效源续尾叠样法。移样法可近百倍地提高位场数值傅里叶反变换的精度,等效源续尾叠样法可数十倍地提高正变换精度。两种算法都不需要增加资料长度和取样密度,因而基本不需要增加计算机时间和内存。文中给出了算例。  相似文献   

遥感筛选评价区化异常的初步探索   总被引：1，自引：0，他引：1  

袁佩新  张柏青  赵琦  付育勇  黄秀英  张振宁 《物探与化探》1993,17(6):456-464

近年来,作者发展了七种以上重要找矿指示元素的野外快速分析法,此乃其一。文中提出一种新的金样冷浸技术,引进了新的光导光度检测方法,样品经溴化钠—硫酸—过氧化氢冷浸,用经丙酮—MIBK处理的泡沫塑料富集金,经混合解脱剂解脱并直接取解脱液用改进的微珠析出法或用光导光度法测定。取10g样品,可测定0．0005- 50g/t范围内的金。方法简便、快速,可在普查分队驻地进行,每一工作日可测定80多个样品,由于废弃了王水分解样品和泡沫塑料的灰化,具有广阔的应用前景。  相似文献   

井下巷道围岩变形的散斑分析法     

郭爱民 《工程地质学报》1994,2(4):59-66

通过对散斑计量法原理分析、数学描述及观测实例的论述，证明激光散斑法是研究煤矿地下结构物相似模型变形状态的一种新的无损检测技术，若采用白光作为光源，该项技术可用于二维变形场的实地测试。  相似文献   

Mechanisms of brittle fracture of rock with pre-existing cracks in compression   总被引：5，自引：0，他引：5  

L. N. Germanovich  R. L. Salganik  A. V. Dyskin  K. K. Lee 《Pure and Applied Geophysics》1994,143(1-3):117-149

  相似文献   

江汉平原渍涝灾害遥感的初步研究   总被引：2，自引：0，他引：2       下载免费PDF全文

喻光明 《水科学进展》1994,5(1):64-70

提出了采用遥感技术与地理信息系统结合研究渍涝灾害的方案,其内容包括:(1)信息源选择与信息处理1(2)清访机理与灾情分析;(3)灾情预报与防治决策.讨论了实施技术系统的基本功能:(1)图像与数据处理1(2)基本信息的提取与分析,(3)损失分析模型与预报模型.作为本方案论证的一部分,还介绍了笔者近期在这一领域中的部分研究成果.  相似文献