摘要
怒江马吉水电站,位于云南省怒江洲福贡县与贡山县境内,初拟坝型为双曲拱坝,最大拟建坝高300m,库容46.96亿m3,是一座高坝大型水库,该电站地处峡谷地貌区,地质条件与岩体力学环境复杂,本文在深入现场调查和各项研究的基础上,主要针对腊早坝址,对坝基地质环境和坝址区工程地质条件进行了研究,对坝基岩(石)体物理力学性质和影响坝基岩体的各项单项因素进行了研究,在对坝基岩体的所采用的各种分级方法进行研究的基础上,提出了马吉水电站坝基岩体分类方法,并利用此坝基岩体分类方法对马吉水电站腊早坝址坝基岩体质量进行了分级,并提出坝基地质缺陷的处理建议。
Nu River hydropower station located between the Fugong county and Gongshan county in Yunnan Province. The largest height of the arch dams planed to reach 300m and its installed capacity could reach 4200MW.This hydropower station belongs to a large (1) project. So, it would be of great significance to classify reasonably the dam bedrock, select kinds of rocks indexes, rational use of rock and select dam configuration.
This power station lied in the valley between Indian Ocean Plate and the Eurasian plate splicing site. It belongs to Gangdise-nyainqentanglha–Gongshan arc wrinkle belt. Although it located in the southwest Yunnan seismic zone, its engineering structure had more stable than others and its seismic activity is weak, only reaching basicⅦintensity degree and corresponding bedrock acceleration rate could reach 112.2 gal.
The Mountains height around two sides of the Nu River hit 3000-4000m, there was a complex geological surrounding. Its bed layer belongs to the Gala Bo Carboniferous rock group, whereas the dam site area belongs to the Caledonian granite gneiss rock group, its rock was mainly composed of Granite gneiss. So its structure was mainly metamorphic belt, the dam site area crack developed rapidly and had more strong rhythm. There was obvious crustal stress, so the data of ground stress was higher than two banks of the dam. The largest main stress value was 29Mpa; it had also an effect on dam belt rock.
Under the continual action of rock structuring change, such as weathering or unloading, the dam belt rock shaped the existing soft rock belt, so it needs to use kinds of methods to analysis its characteristics, including geophysical prospecting , deformation test, other physical mechanics experiment.
This paper is about the research of belt rock surrounding on the foundation of the investigation on scene and in-depth research. Also, the belt rock physical mechanics characteristics were studied. Kinds of single indexes about belt rock qualities were analyzed. Using the indoor and outdoor kinds of rock mass classification methods theory, some suitable standards about Magee hydropower rock mass were designed and further analyzed.
The classification methods were put in accordance with engineering rock mass standard and some standard RMR M, RMR. rock mass was carried on comprehensive value using this methods, the standard changed from I to V. this methods had many advantages, first, it was more convenient and rapid to carry on grading the rock mass, secondly, it was suitable to work and carry on reasearch on the scene. it could have a better effect to building dam.
引文
[1]张悼元、王士天、王兰生.工程地质分析原理.北京:地质出版社,1994
[2]徐志英.岩石力学第三版.水利电力出版社.1993年6月
[3]陆兆溱.工程地质学.水利电力出版社.1989年6月
[4]徐开礼、朱志澄.构造地质学.地质出版社,1989年3月
[5]王兰生、李文纲、孙云志.岩体卸荷与水电工程.工程地质学报.2008(2)
[6]徐俊、张必勇、张国军.怒江松塔水电站坝址区岩石物理力学性质研究.人民长江.2007, (9)
[7]《工程地质手册》编写委员会,工程地质手册(第三版).北京:中国建筑工业出版社,1992.
[8]谷德振.岩体工程地质力学基础.北京:科学出版社,1979.
[9]水利水电工程地质手册编写委员会,水利水电工程地质手册,北京:科学出版社,1979.
[10]吴永华.某坝址岩石风化带声速特征.全国首届工程地质学术会议论文选集北京:科学出版社,1993
[11]孙玉科大型岩体工程中的工程地质力学问题.中国科学基金,1994, (4)
[12]李天斌、王兰生,徐进一种垂向卸荷型浅生时效构造的地质力学模拟.山地学报,2000, 18 (2).
[13]中华人民共和国水利部主编.工程岩体分级标准(GB50218-94 ).北京:中国计划出版社,1995.
[14]中华人民共和国水利部主编.水利水电工程地质勘察规范(GB50287-99)北京:中国计划出版社,1999.
[15]胡卸文、黄润秋.水利水电工程中的岩体质量分类探讨.成都理工学院学报.1996. 23 (3).
[16]余仁福,李天扶.龙羊峡水电站坝基岩体质量分类及力学参数选择.工程地质.1989. 2.
[17]胡卸文、黄润秋、徐志文.澜沧江某电站岩体质量分类的力学参数选取探讨.工程地质学报.1996. 4 (2).
[18]周红英、魏永明、蔺启忠、魏成阶、赵长英.遥感信息在云南怒江马吉水电站区域地质环境调查中的应用.工程勘察.2007.7.
[19]李德伦、王恩林.构造地质学.吉林大学出版社,2001年8月
