浅析云峰井变径前后气压效应与井径比的关系     

刘亚辉 《东北地震研究》1993,(4)

本文通过改变云峰井孔径试验,探讨了提高地下水观测井映震能力的一种途径。  相似文献   

用单钻孔资料和岩层复平求面理倾斜的通用公式探讨          下载免费PDF全文

张伯南 《地质科学》1990,(1):98-100

用改进的数学公式,便于用单钻孔资料和岩层复平求面理倾斜、求岩层厚度、求地层断距等多个课题。  相似文献   

Extremely low temperatures in the stratosphore and very low total ozone amount above northern and central Europe during winter 1989     

Klaus Wege 《Journal of Atmospheric Chemistry》1991,12(4):381-390

On 1 February 1989, -83.5°C was recorded in 27.8 hPa over Hohenpeißenberg, the lowest temperature in the 22-year series. This was measured together with a very low total ozone amount of 266 DU. This may be compared with nearly twice this amount on 27 February 1989. The situation was very unusual: following an extremely cold winter in the Arctic stratosphere, the stratospheric cold pole was located over southern Scandinavia on 1 February in a very southerly position. The analyzed temperatures of -92 °C in 30 hPa were also unusual. Even though the low ozone amounts over Hohenpeißenberg were probably dynamically caused, an additional very small ozone decrease due to heterogeneous reactions in altitudes from 23–28 km, where the temperatures lie below -80 °C, cannot be ruled out. Extinction measurements by the orbitting SAGE II instrument indeed show polar stratospheric clouds over Europe near 50° N during the period 31 January–2 February. Also, polar stratospheric clouds were previously observed over Kiruna at similarly low temperatures and signs of a corresponding small ozone decrease were noted there.  相似文献   

伊朗卡尔赫水电站坝址松散砾岩钻探工艺          下载免费PDF全文

路殿忠 《探矿工程》1994,(3):30-31

在伊朗卡尔赫水电站坝址工程勘察中，采用金刚石双管单动钻具和ＳＭ胶冲洗液进行取样钻探，用清水钻进压水试验，由于钻探工艺合理，钻探质量均达到了设计要求。  相似文献   

706矿点钻孔放射性水异常的揭露评价     

廖瑞福 《铀矿地质》1985,(4)

本文总结了706矿点水中放射性元素的富集、迁移、分布特点及其与水的化学成分的关系,作者评价了该区放射性水异常的铀成矿远景,并进一步指导了水化学找矿工作。另外,根据该矿点的水文地质条件和氡的迁移规律,定量预测了盲矿体赋存的空间位置。  相似文献   

螺旋式扶正器与钻铤组合满眼防斜钻具在基岩地层深水井施工中的应用     

梁贵和  关洪军  毛云 《水文地质工程地质》2005,32(1):98-101

井斜问题是钻井工作,特别是深井钻探中普遍存在的一个问题,它直接关系到钻孔的质量和钻进的安全。本文分析了造成孔斜的原因、防斜原理,介绍了螺旋式扶正器与钻铤组合满眼防斜钻具的工作原理、结构及相关的参数计算方法,并通过工程实例阐述了其在基岩水井钻探中的具体应用,分析了其防斜效果,总结了该技术的特点及其应用前景。  相似文献   

钻井成井中机械洗井方法的适用条件与效果     

李保根 《中国煤田地质》2002,14(2):56-57,61

根据多年来从事水文地质钻井成并工作的经验，结合具体工程实例，对活塞、空压机、泥浆泵、清水泵，接力泵等洗井方法的性能和应用条件作了一些总结，但对于井管直径较大或井水较深的管井，采用联合洗井方法往往可以扬长补短，改善单种洗井方法效果不理想的状况，并取得洗井的最佳效果。  相似文献   

PHYSICAL MODELING OF HYDRAULIC DESILTATION IN TAPU RESERVOIR     

Jihn-Sung LAI  Fi-John CHANG Assistant Research Fellow  Hydrotech Research Institute  National Taiwan University  Taipei    Taiwan Professor  Department of Agriculture Engineering  Hydrotech Research Institute  National Taiwan University  Taipe 《国际泥沙研究》2001,16(3)

1 INTRODUCTIONIn recent years, the concePt of long-term sustained use of reservoirs has been addressed because areservoir is very much considered to be a nonrenewable resource (Morris and Fan, l998). Technically,many options for reservoir sedAnentation control can be utlized to pursue the sustainable develoPment ofwater resources. In general, reduction of incoming sedimen yields from watersheds is often emPloyedin conjunction with hydraulic methods such as flushing or density currnt vot…  相似文献   

煤矿采空区钻孔注浆治理工艺   总被引：6，自引：0，他引：6  

任红旗 《中国煤田地质》2001,13(2):102-103

钻孔注浆充填固结处理煤矿采空区塌陷是一种经济快捷的有效方法，本文就其施工工艺方法进行了简单分析，期望能为其它类似工程提供参考。  相似文献   

基坑支护结构破坏原因综述及实例分析     

刘善国  殷友东  彭新宣 《化工矿产地质》2001,23(3):181-184

高层建筑基坑支护结构破坏原因主要有 :支护结构整体失稳、基坑土体隆起、管涌及流沙的出现、支撑强度不足或压屈、墙体破坏、支护结构平面变形超过限度。某大厦施工中由于桩身强度不足、桩尖达到的深度不够及桩间距过大等原因 ,致使管涌发生 ,造成塌方。通过对事故针对性的处理 ,取得了良好的效果  相似文献