隧道穿越泥石流沟防治设计的几个问题探讨  

Discussion on Some Issues in Prevention and Treatment Design for Tunnel Crossing Debris Flow Gully

作　　者：廖峻[1,2] 肖博[1,2] 王道良[1,2] 石波[1,2] LIAO Jun;XIAO Bo;WANG Daoliang;SHI Bo(National Engineering Laboratory for Highway and Tunnel Construction Technology,China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067,China;Key Laboratory of Communications of Tunnel Construction&Maintenance Technology,China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067,China)

机构地区：[1]招商局重庆交通科研设计院有限公司公路隧道建设技术国家工程实验室,重庆400067 [2]招商局重庆交通科研设计院有限公司隧道建设与养护技术交通行业重点实验室,重庆400067

出　　处：《隧道建设（中英文）》2020年第1期75-82,共8页Tunnel Construction

基　　金：国家重点研发计划(2017YFC08060010,2017YFC08060003,2018YFC0809600);国家自然科学基金项目(41601574)

摘　　要：为保障隧道的建设及运营安全,就当前隧道穿越泥石流沟防治设计存在的几个问题开展针对性研究。首先,对隧道穿越泥石流沟的形式进行归纳总结,通过理论分析和工程类比,给出不同穿越形式对应的设计要点及防治措施。其次,研究排导槽的最佳水力断面问题,排导槽的断面型态系数M越小,水力条件越优,并在此基础上,以直墙弓形排导槽为例,推导出不同槽型的断面型态系数。再次,进一步分析排导槽积淤的主要原因,对当前排导槽防淤积验算公式进行分析和整理,提出基于槽宽验算、槽内泥深及流速验算等公式的排导槽防淤设计验算方法与流程。最后,结合典型工程实例,根据上述流程,设计出合理的隧道建设方案和排导槽形状及其尺寸参数。In this paper,some issues existing in current prevention and treatment design of tunnel crossing debris flow gullies are studied.Firstly,forms of tunnel crossing debris flow gully are summarized,and corresponding design key points and prevention measures for different crossing forms are put forward based on theoretical analysis and engineering analogy.Secondly,the optimal hydraulic section of drainage channel is further studied;the study results show that the smaller the section factor coefficient M of drainage channel,the better the hydraulic conditions;and the section factor coefficients of channels with different shapes are derived by taking straight wall accurate drainage channel as an example.Thirdly,the main causes for sludge accumulation in the drainage channel are analyzed;some current checking formulas for siltation in drainage channels are analyzed and sorted out;and a design checking method and flowchart of sludge accumulation prevention in the drainage channel is put forward based on formulas of channel width checking,mud depth in the channel and flow rate checking,etc.Finally,based on typical engineering examples,a reasonable tunnel construction scheme and shape and size parameters of drainage channel are designed.

关 键 词：隧道工程 隧道穿越形式 泥石流排导槽 水力最佳断面 防淤验算 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]