【摘 要】
：
Measuring in-situ stress by using the Kaiser effect in rocks has such advantages as time-efficiency, low cost and little limitation, but the precision of the me
【机 构】
：
Key Laboratory of Petroleum Engineering, Ministry of Education, China University of Petroleum, Beiji
论文部分内容阅读
Measuring in-situ stress by using the Kaiser effect in rocks has such advantages as time-efficiency, low cost and little limitation, but the precision of the method is dependent on rock properties and delay time of the measurement.In this paper, experiments on the Kaiser effect in limestones were performed, and it was found that the limestones had good ability to retain a memory of their recent stress history and high time-sensitivity.The longer the experiment was delayed from the extraction of the stone, the larger the Felicity ratio was.As the Felicity ratio approached 1, significant Kaiser effect was observed.In-situ stress should be determined by the limestone measurements when the delay time was 40-120 days.Finally, the in-situ stress in a limestone formation could be successfully measured in practice.
其他文献
Drilling engineering has great uncertainty and it always involves huge investment and high risk.Risk analysis of extended reach drilling (ERD) is very important
1 病例资料 女,45岁。因头痛、关节酸痛等感冒症状,于2001年7月6日下午3时口服自购扑感敏2片(厦门建发制药厂,闽卫准字(1996)第001660 号,批号20001118),此后未进任何食物,
医学名词、缩略词是医学概念的语言符号,是定义确切的医学专业“行话”.所谓“隔行如隔山”,与不懂专业的人交流学术问题时缺乏“共同语言”,就是因为名词起着阻隔作用.rn
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
9月21日,“2015中国信息通信业发展高层论坛”在北京举行,工业和信息化部总工程师张峰出席会议并致辞.rn张峰指出,当前我国信息通信业发展呈现良好态势:一是网络建设步伐不断
病历摘要周某,女,15岁,住院号136274。因发作性心悸,晕厥入院。2年前开始发作性心悸、黑朦、昏倒并意识丧失、抽搐和尿失禁。当年类似发作2次,后1年来发作。5个月前再次发作
ＺＬ－１０７Ａ铸造铝合金是Ａｌ－Ｓｉ－Ｃｕ系铸造高强铝合金·经Ｔ_Ｓ状态热处理后强度可达σ_ｂ＝４２０～ ４７０ＭＰａ．在制造大型、高强、复杂关键的工程结构出现缺陷时需要补焊．其焊缝亦要求和母材等强 度．因ＺＬ－１０７Ａ系在ＺＬ－１０７基础上通过添加多元
目的采用MTS法评价五种燃煤PM2.5对血管内皮细胞EA.hy926的细胞毒性。方法以织金散煤、京西散煤、银川散煤、大同散煤及东胜散煤五种煤为样煤,测定五种煤的挥发分产率,在实验
在人类,镁是细胞内第二多的阳离子。人体内的镁约有1,000毫克分子,60%在骨骼中,39%在细胞间质中(其中20%在骨骼肌中),仅有1%在细胞外。血镁可以波动,而细胞内镁的浓度却始终
1 建筑设计 为了体现学校的传统风格,华师大科学会堂方案采用了简单有力的体量和材料。以石材、涂料、玻璃等表现建筑的亲和自然,以大面积的白灰色调配以特有的米黄色文化石