浅谈航电枢纽工程水工金属结构制造的监理预控

随着国家经济的快速发展,我国航电枢纽工程也得到良好、快速的发展。水工金属结构作为航电枢纽工程中的重要组成部份,其质量优劣直接影响着航电枢纽工程质量,因而加强水工金属质量监控非常有必要。基于此,文中以《浅谈航电枢纽工程水工金属结构制造的监理预控》为题,主要从航电枢纽工程水工金属结构制造监理预控的重要性及监理预控措施进行了探讨。     

温湿耦合作用下喷射混凝土孔隙结构与强度试验研究

为分析隧洞围岩温度和洞室环境湿度对喷射混凝土细观孔隙结构特征及单轴抗压强度的影响，采用室内CT扫描和无侧限压缩试验的方法，测试不同围岩温度、湿度条件下喷射混凝土细观孔隙结构的分布特征和单轴抗压强度，建立基于细观结构参数的喷射混凝土单轴抗压强度预测模型。研究结果表明： 1）低湿环境（湿度25%）下，高岩温诱发喷射混凝土孔隙结构和力学性能劣化，温度越高劣化影响越显著，喷射混凝土单轴抗压强度可采用Schiller模型预测； 2）高湿环境（湿度95%）下，60 ℃岩温是喷射混凝土力学性能和孔隙结构特征发生劣化转变的临界温度； 3）引入相对湿度影响系数建立的高湿环境喷射混凝土抗压强度预测模型，其预测结果与试验结果较吻合。     

锦屏二级水电站深埋特大引水隧洞关键技术

Seven tunnels across Jinping Mountain are arranged for Jinping Ⅱ Hydropower Station, with a total length of about 120 km. Among them, four headrace tunnels have a length of 16.67 km, an excavated diameter of 12.4-14.6 m, and a cover depth of 1 500-2 000 m in general. The maximum cover depth is 2 525 m, and the maximum external water pressure is more than 10 MPa. The tunnels are featured by great length, great depth and large diameter. It is the largest and most difficult among the underground tunnel groups built or under construction in China and even the world. With complex hydrogeological conditions and special topographical conditions along the tunnels, many challenging problems, such as rock burst under high in situ stresses, groundwater inrush in karst strata and failure of loading bearing structure, were encountered during construction. A great amount of groundbreaking studies were carried out regarding these problems. The key technical problems during construction of extremely large and deep tunnels were solved successfully. Safe and rapid tunnel construction and stable operation were achieved. The hydropower station started operation in 2014 and has been in a safe and stable operation state. The successful construction of headrace tunnels of Jinping Ⅱ Hydropower Station can provide some experiences and reference for deep tunnel projects in the world.     

小断面水工隧洞施工机械选型及配套

结合实例,介绍小断面水工隧洞施工运输机械设备选型配套过程,为同类型的隧洞施工积累了经验.     

引水隧洞衬砌施工技术

结合工程实例,介绍小断面输水隧洞现浇钢筋混凝土衬砌施工工艺和技术要点,通过合理设计混凝土配合比,解决了不良水文地质条件常年处于饱水状态下过水隧道施工中质量控制问题,并提供了相关技术手段和参数。     

三峡枢纽泄洪、船闸输水及电站调峰对通航条件的影响

回顾了三峡枢纽通航水流条件的研究工作,介绍了研究的进展和取得的成绩,指出了存在的问题和努力的方向。     

水工现浇构筑物底脚漏浆的防治

本文主要阐述防止水工现浇混凝土构造物底脚漏浆的施工工艺。     

影响桥台冲刷各因素的试验研究

根据水工模型试验观测，应用流体力学原理，重点分析和讨论了影响桥台冲刷的主要因素，并根据本文和近年来国外发表的试验数据，应用回归分析，建立了相应的影响系数。     

加强水工作业监管保障船舶航行安全

据初步统计，近两年，浙江辖区共发生水上交通事故655件，其中过往船舶与施工作业船舶或水中构筑物之间发生碰撞或触损事故达53起，约占总数的8％。