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Predictive analysis of stress regime and possible squeezing deformation for super-long water conveyance tunnels in Pakistan
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作者 Wang Chenghu Bao Linhai 《International Journal of Mining Science and Technology》 SCIE EI 2014年第6期825-831,共7页
The prediction of the stress field of deep-buried tunnels is a fundamental problem for scientists and engineers. In this study, the authors put forward a systematic solution for this problem. Databases from the World ... The prediction of the stress field of deep-buried tunnels is a fundamental problem for scientists and engineers. In this study, the authors put forward a systematic solution for this problem. Databases from the World Stress Map and the Crustal Stress of China, and previous research findings can offer prediction of stress orientations in an engineering area. At the same time, the Andersonian theory can be used to analyze the possible stress orientation of a region. With limited in-situ stress measurements, the Hock-Brown Criterion can be used to estimate the strength of rock mass in an area of interest by utilizing the geotechnical investigation data, and the modified Sheorey's model can subsequently be employed to predict the areas' stress profile, without stress data, by taking the existing in-situ stress measurements as input parameters. In this paper, a case study was used to demonstrate the application of this systematic solution. The planned Kohala hydropower plant is located on the western edge of Qinghai-Tibet Plateau. Three hydro-fracturing stress measurement campaigns indicated that the stress state of the area is SH - Sh 〉 Sv or SH 〉Sv 〉 Sh. The measured orientation of Sn is NEE (N70.3°-89°E), and the regional orientation of SH from WSM is NE, which implies that the stress orientation of shallow crust may be affected by landforms. The modified Sheorey model was utilized to predict the stress profile along the water sewage tunnel for the plant. Prediction results show that the maximum and minimum horizontal principal stres- ses of the points with the greatest burial depth were up to 56.70 and 40.14 MPa, respectively, and the stresses of areas with a burial depth of greater than 500 m were higher. Based on the predicted stress data, large deformations of the rock mass surrounding water conveyance tunnels were analyzed. Results showed that the large deformations will occur when the burial depth exceeds 300 m. When the burial depth is beyond 800 m, serious squeezing deformations will occur in the surrounding rock masses, thus requiring more attention in the design and construction. Based on the application efficiency in this case study, this prediction method proposed in this paper functions accurately. 展开更多
关键词 super-long water conveyance tunnel In-situ stress state Squeezing deformation Prediction analysis Kohala hydropower plant
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Case Study on Synchronous Construction Technology for Secondary Lining of Large-diameter Single track Shiel Shield-bored ored Tunnel
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作者 WANG Zhenfei ZHAI Jinying(Translated) 《Chinese Railways》 2023年第2期29-34,共6页
The synchronous construction of the secondary lining during the boring of large-diameter shield faces challenges such as the design of the lining jumbo,the high requirements on the performance for the lining jumbo,the... The synchronous construction of the secondary lining during the boring of large-diameter shield faces challenges such as the design of the lining jumbo,the high requirements on the performance for the lining jumbo,the organization of the construction activities in the small and confined area,the horizontal transportation for shield boring and high safety management requirements.A super-long invert lining construction jumbo,as well as the matching California switch,is developed,which provides solution for the confliction between the invert lining construction and the horizontal transportation.The procedure and method for the synchronous operation of the shield boring and the secondary lining are developed by referring to the synchronous construction of the secondary lining during the boring of the TBMs in hard rocks.Due to the adoption of the synchronous operation of the shield boring and the secondary lining,the construction period is shortened and the construction cost is reduced.The paper can provide reference for the synchronous construction of the secondary lining in similar projects in the future. 展开更多
关键词 large-diameter shield-bored tunnel synchronous construction of secondary lining super-long invert lining construction jumbo California switch "arch+side wall"lining jumbo
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成兰铁路云屯堡特长隧道合、分修方案研究 被引量:10
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作者 朱勇 吴华 《隧道建设》 2014年第7期661-667,共7页
为全面比较、分析成兰铁路云屯堡隧道采用合修(单洞双线)与分修(双洞单线)2种建设方案的优劣,针对云屯堡隧道进出口相连工程已开工建设的施工现状,以及隧道长度大于20 km的特点,根据隧道的地形、地质条件、辅助坑道设置状况,从防灾救援... 为全面比较、分析成兰铁路云屯堡隧道采用合修(单洞双线)与分修(双洞单线)2种建设方案的优劣,针对云屯堡隧道进出口相连工程已开工建设的施工现状,以及隧道长度大于20 km的特点,根据隧道的地形、地质条件、辅助坑道设置状况,从防灾救援、工程投资、施工风险控制、施工组织、支护结构对软岩大变形的适应性、结构抗震、弃碴与环保、运营通风8方面进行了技术经济比较。经过综合比较和分析,得出云屯堡隧道可采用合修方案修建的结论。 展开更多
关键词 成兰铁路 云屯堡特长隧道 隧道合修 隧道分修 方案比较
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成兰铁路云屯堡隧道紧急救援站设计优化研究 被引量:4
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作者 王若晨 朱勇 +1 位作者 邸成 黄华 《隧道建设(中英文)》 北大核心 2020年第7期1029-1034,共6页
针对成兰铁路云屯堡隧道建设过程中因地质原因产生的隧道内紧急救援站方案优化需求,分别从土建规模、工程投资、施工风险、疏散排烟、运营维护5个方面对3个优化方案进行经济技术比选,同时,进一步探索研究单洞合修洞内救援站设置模式。... 针对成兰铁路云屯堡隧道建设过程中因地质原因产生的隧道内紧急救援站方案优化需求,分别从土建规模、工程投资、施工风险、疏散排烟、运营维护5个方面对3个优化方案进行经济技术比选,同时,进一步探索研究单洞合修洞内救援站设置模式。通过研究对比,得出以下结论:1)特长隧道紧急救援站段设置多处小断面通道可能比设置1处大断面综合通道节约投资;2)救援站地段应适当加大结构间距,以避免群洞效应;3)救援站整体土建规模较小时也可能存在较高的施工风险;4)救援站内土建工程方案调整会影响机电设备配套及运营成本;5)竖井式联络烟道宜按90°直弯头设计以便施工及运营维护。 展开更多
关键词 特长隧道 防灾救援 云屯堡隧道 合修隧道 紧急救援站
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成兰铁路云屯堡隧道软岩大变形特征及地质成因分析 被引量:15
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作者 陈桂虎 韩爱果 陈锦涛 《铁道建筑》 北大核心 2017年第10期56-59,共4页
成都—兰州铁路云屯堡隧道已施工洞段出现多处软岩大变形,严重影响了施工安全及进度。从地层岩性、岩体结构、地应力、地下水等方面对云屯堡隧道软岩大变形特征及地质成因进行了分析。结果表明:该隧道软岩大变形具有总变形量大、变形持... 成都—兰州铁路云屯堡隧道已施工洞段出现多处软岩大变形,严重影响了施工安全及进度。从地层岩性、岩体结构、地应力、地下水等方面对云屯堡隧道软岩大变形特征及地质成因进行了分析。结果表明:该隧道软岩大变形具有总变形量大、变形持续时间长、空间分布不均匀的特征;隧道围岩完整性差、强度低是发生大变形的根本原因,较高地应力和发育的地下水造成强度应力比进一步降低,千枚岩、炭质千枚岩地段易发生轻微~中等大变形。 展开更多
关键词 铁路隧道 大变形 地质成因 统计分析 云屯堡隧道 软岩
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