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山坑拱坝坝基地质条件较好,主要是左右岸建基面出现断层F1、f13和一些构造裂隙带,所以,断层处理设计是本工程的关键。针对断层的特性,采用了相应的处理措施,使地基满足砌石拱坝的要求。 相似文献
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开展禹门口以及水源泵站站址地质勘查,查明地层岩性、地质构造、水文地质、工程地质条件。通过勘察和资料分析认为,站址存在有断层破碎带、岩质高边坡、断层带涌水问题,提出针对断层破碎带问题采取加固处理措施;对岩质高边坡要增设马道,对边坡进行支护处理;针对高陡边坡存在岩体质量较差的泥灰岩采取挂铅丝网处理;施工前对F4断层采取灌浆封堵等措施。 相似文献
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赵波 《水利与建筑工程学报》2008,6(2):62-66
陕西引红济石调水工程地质条件非常复杂,施工过程中多次出现断层破碎带塌方、突发性涌水、涌泥等地质难题。结合施工采用的方法、措施分析、研究地质特性和规律,总结施工过程中发生地质灾害的经验教训,认为可以通过加强施工过程控制来有效降低隧洞施工地质风险和灾害发生的可能,从而达到加快工程建设进度,节约工程投资的目的。 相似文献
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地质雷达在福堂水电站引水隧洞施工超前预报中的应用 总被引:7,自引:0,他引:7
在福堂水电站引水隧洞施工中,采用地质雷达预报掌子面前方的不良地质体及相对富水带,根据地质雷达测试和开挖验证的资料,建立起完整岩体、断层破碎带、富水带、岩脉带、裂隙密集带及岩性变化带等典型地质体同雷达图像特征之间的关系。与开挖揭露的地质情况对比表明,地质雷达超前预报达到了较高的准确度。 相似文献
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某输水隧洞工程,经前期地质勘查,确定存在断层破碎带,其中F72断层破碎带为最大破碎带,且完整性较差,并富水,易发生围岩坍塌、突涌水、涌泥涌砂等不良地质灾害。为施工安全,文中为隧洞施工遇到断层破碎带提前制定专项预处理方案,相关方法及参数在施工中根据实际情况进行适时调整,力争安全快速通过断层破碎带。 相似文献
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以某水库大坝扩建工程为例,重点对扩建工程区的地质断层和岩体的节理进行了分析,对断层破碎带和岩体卸荷节理等地质问题提出了解决措施,结果表明,所采取的措施能满足工程要求,对大坝扩建工程的后期管理也提出了合理化的建议。 相似文献
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用声波法划分坝基断层影响带的现场测试研究 总被引:1,自引:0,他引:1
黄河李家峡水电站工地现场测试中,采用全新的抗干扰声波测量系统和防止测量孔坍塌的新方法。综合考虑声波的时域和频域特性,利用实测资料编绘出被测岩体波速和主频的综合特性曲线,据此划分出断层影响带的界线。并列表示出反映断层带,断层影响带及围岩的强度,变形特性及完整性的动力参数。为大坝的稳定分析及断层处理提供了依据。 相似文献
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越南上昆嵩水电站引水隧洞地质情况复杂,存在断层破碎带、强风化带,高地下水带,高地应力带等不良地质情况,易发生塌方、岩爆、高压大流量地下涌水等地质灾害。为了准确预测掌子面前方的岩石情况,综合运用了多种超前地质预报技术,来探测掌子面前方的围岩地质情况,并根据预测结果采取相应的不良地质处理工法。防止或减少了不良地质灾害,保证了工期和施工安全。 相似文献
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对嘉兴地区主要给水厂近年来应用立体弹性填料、LT型悬浮球填料、YS型悬浮填料、卵石填料等的生物预处理工艺从填料及配套设施、工艺运行参数、运行效果、成本等方面进行了比较.认为弹性填料生物预处理更适用于低浊(50 NTU以下)、低氨氮(1.5 mg/L以下)原水,LT型悬浮球填料生物预处理适用于低中浊(100 NTU以下)、低中氨氮(2.5 mg/L以下)原水,YS型悬浮填料生物预处理及"SAF"滤池对低浊、中高氨氮(2.5 mg/L以上)原水有较好的适应性.最后探讨了弹性填料存在的短流、积泥,悬浮填料存在的部分填料流化不均匀,富氧的生物工艺单元内水生动物泛滥等问题. 相似文献
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Changes in nutrient levels in some Eastern European rivers in response to large-scale changes in agriculture. 总被引:3,自引:0,他引:3
P St?lnacke S M Vandsemb A Vassiljev A Grimvall G Jolankai 《Water science and technology》2004,49(3):29-36
Since the late 1980s, the use of commercial fertilisers in most Eastern European countries has decreased at an unprecedented rate. We examined the impact of this dramatic reduction in agricultural inputs on concentrations of nutrients in four rivers in Eastern Europe: the Emajogi and Ohnejogi (Estonia), the Daugava (Latvia), and the Tisza (Hungary). Time series of nitrate (NO3-N) and phosphate (PO4-P) concentrations and data on runoff were selected to represent catchments with substantial areas of agricultural land and available time series of sufficient length and frequency. The study period was 1987-1998. We detected downward trends in nitrate-N and phosphate-P in only two of the four rivers. Our results imply that the response to the extensive decrease in agricultural intensity since the late 1980s has been slow and limited in many rivers. Corresponding results in the literature are inconclusive and comprise several examples of both decreasing and non-decreasing nutrient concentrations. Our findings, along with similar data from other studies, indicate that large cuts in nutrient inputs do not necessarily induce an immediate response, particularly in medium-sized and large catchment areas. Moreover, the difference we noted between nitrogen and phosphorus suggests that factors other than reduced fertiliser application influenced the inertia of the water quality response. 相似文献
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对长江、珠江等河口及其近海水域缺氧现象与影响因素进行研究,结果表明,主要分布于长江与珠江河口及其邻近海域的缺氧现象,夏季(6—8月)达到最盛,秋冬季消失;长江口的缺氧区域主要位于30.75°N~32°N,122.5°E~123.25°E附近海域,具有南北2个缺氧中心;珠江口缺氧程度相对较轻,缺氧区域主要在广州黄埔区河段至虎门水域和伶仃洋;辽河、钱塘江、海河等河口区域也时而出现零星的缺氧现象;水体缺氧受控于多项环境要素,物理层化作用是缺氧产生的最初诱因之一,陆源污染物的分解则是重要的耗氧负荷;各河口区特征各异,潮汐、洋流、营养盐、叶绿素a等要素对缺氧区的范围、程度和持续时间影响程度不一。 相似文献
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深圳河支流新洲河属雨源型河流,因污染而采取全线截排污水整治.在上游河道内利用生物飘带技术处理低浓度污水,处理达标后,作为河流生态水源.在中游将截排污水引入自然循环方式污水处理系统,处理达标后作为河道补水.下游利用射流清淤配合利用天文大潮进行水体交换,达到消除黑臭水体,维持河道水景观的目的.介绍新洲河水环境综合整治采用的几项关键技术的设计原理及应用效果. 相似文献
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李广杰 《水科学与工程技术》2001,(5):7-8
洋河水库是我省重点病险库之一,1998年12月实施除险加固工程。工程建设过程中在科研、设计、施工及管理等方面取得了可喜的成果。通过研究分析,因地制宜地选择了天然建筑材料,合理确定了施工方案,有效保证了施工质量,节约了工程投资。 相似文献
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Ecological river engineering can be defined as the design and implementation of river works and river restoration works for the benefit of human society. It also guarantees the sustainable ecological functions of a river, such as its habitats and self-purification of its water. It is currently in the beginning stages in Korea, utilizing scientific knowledge on the processes of aquatic ecosystem degeneration and a methodology for solving the ecological problems in artificially altered rivers currently under development. The changes in river management and work practices in Korea may be best explained with a chronologically progressing sequence of ‘Natural’, ‘Disaster-prevention’, ‘Occupied’, ‘Park’, and ‘Close-to-nature’ rivers. Since the 1960s, the focus on river management and work has shifted from flood control only, to both flood control and riverine habitat conservation and restoration. Five research topics have been selected for this article, and the progress of each research area is briefly described with a representative picture in each topic. They are as follows: (1) flow resistance due to vegetation, (2) environmental flow, (3) floodplain vegetation modeling, (4) small dam removal, and (5) river restoration. For the future prospects of research on ecological river engineering in Korea, a necessity of further research on floodplain vegetation recruitment and succession, which can explain the so-called ‘white river’ and ‘green river’, is underlined, among others. Finally, two ongoing large research programs on river ecosystem restoration, of which are sponsored by the Government of Korea, are briefly introduced, followed by the introduction of a near-prototype experiment facility recently completed mainly for research on ecological river engineering. 相似文献