贺家湾隧道洞口浅埋偏压段施工研究

发布时间：2018-01-04 02:44

本文关键词：贺家湾隧道洞口浅埋偏压段施工研究　出处：《郑州大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国铁路建设的大规模展开及技术标准的不断提高,隧道长度在线路中所占比重也正逐渐增加,由于地质构造的特殊性和复杂性,往往会增大其施工难度。本文以石长铁路增建第二线站前2标贺家湾隧道施工为背景,对隧道浅埋偏压所出现的问题加以研究,提出了一些技术性的处理措施。该隧道位于湖南省益阳市桃江县三官桥镇,隧道洞口段围岩为全风化-强风化板岩,褐黄色,岩体破碎-极破碎,较松散,自稳性差,且偏压,覆盖层薄,施工技术要求高,安全压力大,本隧道为全长339米的单线铁路隧道,三进三出,分三段明洞,三段暗洞和两个斜切式洞门,设计从进口段进洞,由于进口段为挖方段,需进行石方爆破,工程量大,且离既有铁路运营线仅35米,运营部门要求爆破施工必须在封锁点内进行,每日施工时间仅有两个小时,不能满足工期要求。本隧道出口段39米外为新建拖木冲隧道,且已施工完毕,可直接利用相关设备和场地,经综合考虑,本着便于施工管理、节约成本、缩短工期的要求,经与设计院沟通,决定选择采用自出口端向进口端掘进的施工方案。本文重点对第三段(DK154+240-DK154+311)暗洞段进行施工技术及现场管理进行介绍。在施做了出口段洞顶截水沟、边仰坡防护,进行暗洞掘进8米后,发现隧道从左侧导向墙拱脚垂直至洞顶地表并沿洞顶地表向小里程延伸至洞身左侧处出现0.5-1.5cm的贯通裂缝,DK154+311-293段第一、第二板二衬混凝土出现横向裂纹,暗洞段DK154+244处位置(还有4米就出洞)出现初支变形侵限以及塌方状况,经对其产生的原因进行分析并与设计探讨,制定出比较可行的处治方案,通过施工实践,有效解决了出现的问题,并及时消除了安全隐患,为今后类似工程的施工提供一些借鉴。
[Abstract]:With the expansion and technical standards of railway construction in our country continues to improve, the tunnel length accounted for in line proportion is gradually increased, because of the complexity and particularity of the geological structure, often increases the difficulty of construction. The second line railroad station 2 Jia Wan Tunnel Construction as the background, to study on the bias of shallow buried tunnel, some technical measures are put forward. The tunnel is located in the three county of Yiyang City, Hunan Province, Taojiang Town, tunnel surrounding rock is weathered strongly weathered slate, brown yellow, broken rock - breaking, loose, self stability is poor, and the bias voltage and the thin covering layer, construction technology requirements, safety pressure, single track railway tunnel in the tunnel for a total length of 339 meters, three three, paragraph three paragraph three Ming, dark hole and two oblique portal, design from the entrance into the hole, because the entrance to The excavation section, for rock blasting, large quantities, and from the existing railway line is only 35 meters, the operations department requirements of blasting construction must be carried out in the blockade, the construction time of only two hours a day, can not meet the project requirements. The tunnel 39 meters for the new drag muchong tunnel, and has the construction is completed, can be directly used for related equipment and facilities, after comprehensive consideration, with convenient construction management, save the cost, shorten the construction period, the communication with the Design Institute, decided to choose from the outlet to the inlet end of the tunnel construction scheme. This paper focus on the third segment (DK154+240-DK154+311) dark hole section of the construction technology and site management are introduced. The outlet section of roof drainage ditches in application, slope protection, dark tunnel excavation 8 meters, found the tunnel from the left guide wall to the roof and arch foot vertical surface to extend along the top surface to hole small mileage At the left side occurs through the cracks of 0.5-1.5cm and DK154+311-293 segment of the first, second and two lining concrete transverse cracks occur, the dark hole section of DK154+244 position (and 4 meters out of the hole) appear primary support deformation invading limit and collapse by the situation, the causes are analyzed and discussed and design, develop a treatment scheme comparison through construction practice, feasible and effective solution to the problems, and timely elimination of security risks, for the future construction of similar projects to provide some reference.

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4

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