陕北台塬区深层黄土湿陷性研究及地基处理     

董转运  吕远强 《煤田地质与勘探》2008,36(2):52-54

陕北台塬区深层湿性黄土厚度大,地基处理困难。室内试验表明:该区黄土的湿陷性与其结构、天然含水量、孔隙比、时代成因等因素相关,黄土的湿陷系数由上到下逐渐递减,表明湿陷性随深度增加而逐渐减弱;黄土的含水量和孔隙比分别与湿陷系数呈反相关和正相关关系。提出陕北台塬区深层湿陷性黄土地基处理时,对单位荷重小于250 kPa的建筑物,适宜采用灰土垫层、灰土挤密桩或灰土挤密桩与灰土垫层相结合方案;单位荷重大于或等于250 kPa的建筑物,宜采用桩基础方案。   相似文献   

预采疏放法防治首采工作面顶部含水层突水   总被引：3，自引：1，他引：2  

毛允德  李敏 《煤田地质与勘探》1999,27(4):50-51

新建矿井首采工作面突水是矿井生产后的首次大突水,其防治技术以往仅限于钻孔放水法,效果不佳。作者将"三带理论"用于生产实践,明确提出了顶部充水含水层包括煤层之上,离层带之下的所有含水层,首先开发了预采疏放法防治顶部含水层突水的技术,并在山东枣庄矿业集团高庄煤矿实施获得成功。   相似文献   

小秦岭金矿带混汞提金法中的汞污染及对策研究   总被引：19，自引：0，他引：19  

张成渝  张鑫  常祖峰 《地质灾害与环境保护》1999,10(2):18-23

河南省小秦岭金矿带的成矿类型,决定了该地区大多采用混汞提金法进行黄金选冶的现实。由于混汞提金法的广泛与长期使用,汞污染在不同的金矿及周围地区都有程度不一的表现。着眼于汞的污染治理与环境可持续发展之间的关系,从汞的毒害机理、混汞提金法中汞的污染途径入手,讨论汞对土壤和人类的危害,并对汞污染提出相应的治理对策。  相似文献   

珍珠颜色的优化处理   总被引：7，自引：0，他引：7  

王惊涛  梁金龙  彭明生 《矿物岩石地球化学通报》1999,(4)

珍珠的颜色可大致分为白色、黄色、红色、深色和杂色五大色系。然而刚从母贝中取出的珍珠不论是天然还是养殖珍珠,颜色都难尽人意,颜色纯净度、饱和度、均匀度都达到好的珍珠少之又少。传统上人们十分偏爱白色珍珠,近年来黑珍珠又被受青睐,因此绝大多数的珍珠必须经过优化处理（主要是颜色的优化处理）,才能提高其价值。１　珍珠的颜色珍珠的颜色分为体色和伴色。体色是指珍珠本体所具有的颜色,亦称背景色,是由有机质中特有的一种元素———卟啉所决定的。卟啉是卟吩（Ｃ２０Ｈ１４Ｎ４）的衍生物,是由四个吡咯环通过四个Ｃ原子连接…  相似文献   

某矿渣垫层地基处理工程实录     

庄俊 《地质科技情报》1999,(Z1)

以武钢某配电室矿渣垫层地基处理工程为例,阐述了地基沉降的原因、地基加固处理所用的设备、工艺流程及地基沉降跟踪观测的结果,表明注浆法对这类地基加固处理后的效果显著  相似文献   

南京过江沉管隧道软基处理水下注浆方案探讨          下载免费PDF全文

陈兰云  李蓉  杜嘉鸿  王杰 《探矿工程》1999,(2):15-16

分析了京沪高速铁路南京过江沉管隧道的工程地质条件,比较了各种地基处理方法的优缺点,提出采用喷射注浆处理沉管地基的方案,为该工程的地基处理探索出一条新路。  相似文献   

Design and costs for a system to reduce chloride levels in the Red River by shallow-well collection and deep-well disposal     

T. S. Green  B. A. Memon  A. F. Patton  M. W. Pitts 《Environmental Geology》1999,38(2):141-148

 The Red River drains 242000 km² with 90% of this area being downstream of discharges from naturally occurring brine seeps and springs. The upstream area has been designated as a major chloride emission area in Texas and Oklahoma. Ten major brine source emission areas along the tributaries to the Red River were identified by U.S. Public Health Service and U.S. Army Corps of Engineers. Eight of these areas were deemed suitable for the control of brine emissions by structural methods including a ring dike to enclose brine springs; low flow dams to capture and divert stream flows with high chloride content to evaporation lakes; and shallow aquifer brine collection wells with a deep-well disposal system. Two adjacent emission areas, designated as Areas XIII and XIV, contribute 500 metric tons of salt per day to the Red River. These areas, along Jonah Creek and Salt Creek, tributaries to the Prairie Dog Town Fork of the Red River were selected for investigation to control brine emission by utilization of shallow collection wells and disposal by deep injection wells. Drilling programs and pumping tests were performed to determine the number and location of shallow collection wells. Eighteen wells with 12 operating full time, will be located in the primary emission areas. The collected brine will be conveyed through corrosion-resistant pipelines to a treatment facility for filtration at a rate of 300 l/s. Additional pipelines will convey the filtered brine to deep injection wells for disposal. Nine deep wells will be installed with seven operating full time. Design criteria for the project are 100-year life expectancy and automated operation with minimum supervision and maintenance. The required minimum operating, maintenance and supervision coupled with 100-year life expectancy of the project added significantly to the estimated US $58 million capital cost of the project. However, the reduction in annual cost for labor, repairs and replacement of the component of the system should result in a lower life cycle cost. The estimated annual operating and maintenance cost is US $4.7 million. Received: 5 May 1998 · Accepted: 30 June 1998  相似文献   

海洋生物高分子壳聚糖微孔树脂的开发     

蔡邦肖 《海洋学研究》1999,17(2):39-42

在简要评述甲壳素和壳聚糖的资源、产业及其应用特点的同时,着重叙述壳聚糖微孔树脂的制备、性质、功能和应用,从而展示壳聚糖及其微孔树脂的发展前景。  相似文献   

微藻在污水中的除磷脱氮作用     

董俊德  吴伯堂  黄羽庭 《热带海洋学报》1999,18(1):4

初步调查了广州海珠区污水排放区污水中微藻的组成,表明该区微藻以蓝藻门颤藻科Ｏｓｃｉｌｌａｔｏｒｉａｃｅａｅ为主,以小颤藻Ｏｓｃｉｌｌａｔｏｒｉａｔｅｎｕｉｓ、两栖颤藻Ｏ．ａｍｐｈｉｌｉａ为优势种;测定了其在污水中的除磷脱氮能力,结果表明,两优势种处理污水氮、磷的能力随微藻的生长期和污水中氮、磷浓度的不同而有较大的变化。  相似文献   

临南油田工业污水经处理后回注对地层的影响   总被引：2，自引：0，他引：2  

刘中云  陈永红  伍家忠  尹先清  罗觉生  王正良 《地质科技情报》2000,19(3):61-64

探讨了临南油田污水处理后处理水与地层水的配伍性及对储层的敏感性问题,结果表明,临南油田处理水与地层水配伍性能好,不会产生沉淀结垢现象,对储层存在一定的速敏效应,不存在盐敏效应,并表现无碱敏或弱碱敏及无酸敏或弱酸敏效应,因此对储层损害程度小,能用于油田污水回注,提高石油采收率。  相似文献