正文：
近日，西安至延安高速铁路（以下简称“西延高铁”）全线最长隧道——宜君隧道顺利贯通，标志着西延高铁建设取得重大进展。宜君隧道全长17509米，是陕西乃至我国目前在建最长单洞双线高铁隧道，隧道最大埋深达395米，隧道内四五级围岩占比高达68.5%，施工难度极大。
西延高铁全长约300公里，设计时速为350公里，是国家高速铁路网包（银）海通道的重要组成部分，预计将于2025年12月底建成通车。届时，西安至延安的运行时间将从目前的两个半小时缩短至一小时左右，极大便利沿线人民群众出行，对促进陕北革命老区经济社会发展具有重要意义。
西延高铁的建设，不仅是区域交通网络的重要补充，也是我国西部地区铁路建设的重要里程碑。它的建成将有效提升陕北地区的交通条件，促进区域经济一体化，为沿线地区带来新的发展机遇。同时，高铁的开通也将加强西安与延安之间的联系，对于传承红色文化、促进文化旅游发展具有积极作用。
据了解，西延高铁的建设得到了社会各界的广泛关注和支持。施工单位在确保工程质量和安全的前提下，积极推进隧道施工，克服了重重困难，确保了隧道工程的顺利贯通。
随着宜君隧道的贯通，西延高铁的建设进度又向前迈进了一大步，预计将在明年年底前完成建设任务，届时将极大地改善陕北地区的交通状况，促进区域经济的快速发展。
英语如下：
Title: “Yichun Tunnel Completion Accelerates Construction of Xi’an-Yan’an High-speed Railway”
Keywords: Yichun Tunnel Completion, Xi’an-Yan’an High-speed Railway, 350km/h
News Content:
The longest tunnel on the Xi’an-Yan’an High-speed Railway (referred to as the “Xi-Yan High-speed Railway”), the Yichun tunnel, has been successfully completed, marking a significant milestone in the construction of the Xi-Yan High-speed Railway. The Yichun tunnel, with a total length of 17,509 meters, is the longest single-bore double-track high-speed railway tunnel currently under construction in Shaanxi Province and across China. The tunnel reaches a maximum burial depth of 395 meters, with 68.5% of its interior consisting of rock strata with grades 4 and 5, making the construction extremely challenging.
The Xi-Yan High-speed Railway is approximately 300 kilometers long and is designed to operate at a speed of 350 kilometers per hour. It is an important part of the national high-speed railway network’s Baoxing-Haibei corridor, and it is expected to be completed and opened to traffic by the end of December 2025. When operational, the travel time between Xi’an and Yan’an will be significantly reduced from the current two and a half hours to approximately one hour, greatly facilitating the travel needs of the people along the line and playing a crucial role in promoting the economic and social development of the northern Shaanxi revolutionary base area.
The construction of the Xi-Yan High-speed Railway not only serves as an important supplement to the regional transportation network but also marks a significant milestone in railway construction in China’s western region. Its completion will effectively improve transportation conditions in northern Shaanxi, promote regional economic integration, and bring new development opportunities to the areas along the line. Additionally, the opening of the high-speed rail will strengthen the connection between Xi’an and Yan’an, and has a positive impact on the transmission of red culture and the development of cultural and tourism.
It is understood that the construction of the Xi-Yan High-speed Railway has received widespread attention and support from all walks of life. The construction units have promoted tunnel construction while ensuring engineering quality and safety, overcoming numerous difficulties to ensure the smooth completion of the tunnel project.
With the completion of the Yichun tunnel, the construction progress of the Xi-Yan High-speed Railway has moved forward another significant step, with expectations of completing the construction tasks before the end of next year, which will greatly improve the transportation conditions in northern Shaanxi and promote the rapid development of regional economy.
【来源】https://www.ithome.com/0/787/660.htm
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