蓟运河防潮闸基础加固高压喷射试验施工          下载免费PDF全文

刘才高  黄灿新 《探矿工程》1999,(5):24-26

通过对蓟运河防潮闸基础加固高压喷射试验施工,对存在缺陷的闸基灌注桩进行围封高压喷形成高强度的复合桩体,并在闸底板上,下游建造高压旋喷防渗墙,以及闸底板下的脱空回填灌浆处理,解决闸基础的渗透稳定和抗滑稳定问题,为闸基加固工程及类似建筑物处理提供满足设计要求的施工工艺参数。  相似文献   

碟形网箱水动力特性的研究   总被引：11，自引：2，他引：9  

李玉成 宋芳董国海  张怀慧 《海洋工程》2004,22(4):19-25

根据物模实验得到碟形网箱在不同海况条件下的受力并给出了其估算方法和公式及其相关系数的取值,同时总结了碟形网箱的运动特性。  相似文献   

装配式剪力墙竖向钢筋套筒注浆连接试验研究          下载免费PDF全文

任宏伟  严珊  王思远 《世界地震工程》2020,(1):093-100

通过高应力反复拉压试验,研究了18个钢筋套筒注浆连接试件的破坏形态和套筒的应变,并对钢筋套筒注浆连接试件的屈服强度、极限强度和钢筋接头的等级进行了分析。结果表明:连接试件发生钢筋拉断和粘结破坏2种破坏形态,其屈服强度和极限强度均与钢筋母材强度相接近,另外钢筋连接采用套筒注浆的方式施工便捷和合理可靠,并通过对试验数据分析,给出了直径为12mm和14mm的HRB400钢筋采用此套筒注浆方式连接时套筒参数的建议值,为钢筋套筒注浆连接在装配式剪力墙中的设计和应用研究提供了一定的参考借鉴。  相似文献   

深异形地下连续墙施工技术研究          下载免费PDF全文

易智宏  赵建平  汪应朝  李莉萍 《探矿工程》2012,39(11):44-50

对深异形地下连续墙施工的关键点进行了系统的研究、探讨,归纳出了深异形地连墙施工的7个关键环节。分别对这7个重点问题进行了论述,并通过工程实例,对其应用效果加以验证。  相似文献   

地下连续墙“三合一结构”的施工技术          下载免费PDF全文

易智宏  曾继文  黄安 《探矿工程》2010,37(8):51-53

阐述了＂三合一结构＂地连墙与传统地连墙相比的优势;介绍了地连墙在作为＂三合一功能结构＂时,在技术与施工方面主要应严格控制的几个关键环节;论述了在实际工程中的应用效果和趋势远景。  相似文献   

大直径竖井灌浆提升系统          下载免费PDF全文

邓会君  李明 《探矿工程》2011,38(11):62-64

安徽琅琊山抽水蓄能电站调压竖井井深70 m,外径20 m,内径18.6 m。利用吊盘、吊笼、卷扬机建立灌浆提升系统,完成井身段固结灌浆。通过优化施工方案、合理组织施工、建立完善的规章制度、加强职工职业培训、严格执行施工安全技术措施,圆满地完成了灌浆施工任务。  相似文献   

Forms and Balance of Nitrogen and Phosphorus in Cage Culture Waters in Guangdong Province, China     

WEN Yanmao WEI Xiange SHU Tingfei ZHOU Jingfeng YU Guanghui LI Feng HUANG Yanyun 《中国地理科学(英文版)》2007,17(4):370-375

In order to approach the characteristics of nitrogen and phosphorus pollution caused by cage culture and the balance of nitrogen and phosphorus during the process of cage culture, a monitoring was conducted in Daya Bay of Guangdong Province, China from April 2002 to Jane 2003. The results show that the concentrations of total nitrogen (TN) in the waters at the sites with five and ten years of cage culture history are 1.8 and 2.3 times of that at control site respectively. Ammonium (NH3-N) is the main form of nitrogen in spring while nitrate ( NO3 -) in winter. The concentrations of TN, total dissolved nitrogen (TDN) and dissolved organic nitrogen (DON) are highest in autumn. The concentration of phosphorus increases with the increasing of the culturing time, among which phosphate ( PO 34-) increases most obviously. The concentrations of total phosphorus (TP) and total dissolved phosphorus (TDP) are highest in autumn. The nitrogen and phosphorus are accumulated significantly in the sediment of cage culture area. The model of N balance in the cage culture area: bait (70.62%) fry (0.28%) input by tide (14.8%) release from sediment (14.3%) = harvest of adult fish (12.07%) deposition into sediment (28.75%) output by tide (56.18%) others (3.00%). The model of P balance: bait (83.11%) fry (0.17%) input by tide (12.23%) release from sediment (4.49%) = harvest of adult fish (8.43%) deposition into sediment (48.59%) output by tide (41.94%) others (1.04%). In one fish growth year, the contents of nitrogen and phosphorus in harvest of adult fish are only 17.0% and 10.1% of the contents of nitrogen and phosphorus in fish bait and fry, wherein 83% of nitrogen and more than 89% of phosphorus in fish bait became marine pollutants.  相似文献   

Spatial modeling of environmental vulnerability of marine finfish aquaculture using GIS-based neuro-fuzzy techniques     

Navas JM  Telfer TC  Ross LG 《Marine pollution bulletin》2011,62(8):1786-1799

Combining GIS with neuro-fuzzy modeling has the advantage that expert scientific knowledge in coastal aquaculture activities can be incorporated into a geospatial model to classify areas particularly vulnerable to pollutants. Data on the physical environment and its suitability for aquaculture in an Irish fjard, which is host to a number of different aquaculture activities, were derived from a three-dimensional hydrodynamic and GIS models. Subsequent incorporation into environmental vulnerability models, based on neuro-fuzzy techniques, highlighted localities particularly vulnerable to aquaculture development.The models produced an overall classification accuracy of 85.71%, with a Kappa coefficient of agreement of 81%, and were sensitive to different input parameters. A statistical comparison between vulnerability scores and nitrogen concentrations in sediment associated with salmon cages showed good correlation.Neuro-fuzzy techniques within GIS modeling classify vulnerability of coastal regions appropriately and have a role in policy decisions for aquaculture site selection.  相似文献   

象山港大黄鱼(Pseudosciaena crocea)网箱养殖区及邻近海域沉积物中异养细菌生态分布   总被引：1，自引：1，他引：0  

廖红芳  郑忠明  冯坚  朱津永  丁露露  蒋珊娜 《海洋与湖沼》2014,45(6):1308-1316

调查了投饵期(8月)和越冬期(11月)象山港大黄鱼(Pseudosciaena crocea)网箱养殖区及周围海域沉积物中有机物含量、异养细菌数量和群落结构。结果表明:养殖区沉积物(0—5cm层)中总磷、总有机氮含量在投饵期和越冬期均显著高于邻近对照海域(P0.05)。沉积物中异养细菌、弧菌数量分别在3.2×104—5.2×105 CFU/g和2.2×103—1.7×105 CFU/g之间,养殖区沉积物细菌数量大于周围邻近海域。16S r DNA法分析结果表明,研究区域投饵期的优势属均为弧菌属,越冬期为芽孢杆菌属。各采样区异养细菌的多样性表现为养殖区周围邻近区域、投饵期越冬期。异养细菌数与沉积物中TON、TP含量呈显著正相关,表明象山港大黄鱼养殖区沉积物中可培养异养细菌数可能受有机氮和磷酸盐含量的限制。研究表明,大黄鱼网箱养殖对象山港沉积物中的有机积累、异养细菌群落结构组成及多样性影响显著。  相似文献   

Coastal and marine ecological changes and fish cage culture development in Phu Quoc,Vietnam (2001 to 2011)     

Diep Thi Hong Nguyen  Wenresti G. Gallardo  Taravudh Tipdecho 《国际地球制图》2013,28(5):486-506

This study employed image enhancement for LANDSAT TM and ALOS imagery to monitor the changing status of coastal resources from 2001 to 2011, object-based classification of high-resolution THEOS imagery to extract fish cage culture sites and interpolation methods to determine marine environmental quality in 2011 in the northern part of Phu Quoc Island. There were five classes in the study site: natural forest, Melaleuca forest, agriculture, peat and built-up areas. Agricultural land and Melaleuca forest changing into built-up areas constituted approximately 51.13% of the total area changing. The benthic seagrass habitat increased dramatically from 2001 to the end of 2010. Besides, marine culture has been concerned to cage culture which is one of the sources directly affecting aquatic life and water quality in coastal environment. Cage culture locations were detected using high-resolution imagery as THEOS data for image fusion and Object-based Image Analysis methods. Water quality criteria including nitrogen, phosphorus and chlorophyll-a concentrations were determined by interpolation method, and the spatial distribution of these parameters showed a concentration in the study area in the range from 0.17 to 0.49?mg/L, 0.012 to 0.073?mg/L and 0.26 to 1.046?μg/L, respectively.  相似文献