隧道喷层与围岩相互作用的能量特性研究  

Study on Energy Characteristics of Interaction between Spray-layer and Tunnel Surrounding Rock

作　　者：郑余朝[1] 朱斌忠 劳志伟 廖保林 仇文革[1] 章慧健[1] ZHENG Yuchao;ZHU Binzhong;LAO Zhiwei;LIAO Baolin;QIU Wenge;ZHANG Huijian(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;Chengdu Chengtie Engineering Project Management Co.,Ltd.,Chengdu 610036,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]成都成铁工程项目管理有限公司,四川成都610036

出　　处：《铁道学报》2024年第12期180-192,共13页Journal of the China Railway Society

基　　金：国家自然科学基金(52078431)。

摘　　要：探明喷层-围岩相互作用的能量机理,对弥补以强度设计为主的支护设计理论不足、发展基于能量原理的隧道设计方法至关重要。基于应力释放的数值方法系统研究隧道喷层-围岩相互作用的能量机理,定义喷层整体失效时的弹性应变能为其极限应变能,其可用于评价喷层承载能力;开展模型试验,通过分析逐级加载作用下喷层支护力学行为与能量演化,验证隧道喷层-围岩相互作用的能量机理与喷层极限应变能的存在;基于数值试验,开展喷层极限应变能影响因素研究,发现喷层极限应变能随地层侧压力系数、围岩等级和喷层厚度增加而增加,并建立多因素极限应变能标准化拟合函数公式。进一步给出基于能量原理的喷层极限状态验算公式,应用该公式验算模型试验原型隧道喷层设计厚度范围,与隧道喷层厚度设计值接近,该验算公式考虑喷层与围岩基于能量的力与位移的相互作用关系,可为高储能围岩中隧道喷层设计提供参考。Probing the energy mechanism of the interaction between the spray-layer and tunnel surrounding rock is important for addressing the shortcomings of the strength-based support design theory for tunnel design and developing tunnel design methods based on energy theory.Based on the stress release and numerical method,the energy mechanism of the interaction between spray-layer and surrounding rock was systematically studied.The strain energy at the time of the spray-layer overall failure was defined as the ultimate strain energy of the spray-layer,which can be used to evaluate the bearing capacity of the spray-layer.Model test was carried out to verify the energy mechanism of interaction between spray-layer and surrounding rock and the existence of ultimate strain energy for spray-layer by analyzing mechanical behavior and energy evolution of spray-layer under gradually loading.Based on the numerical test,a study on the factors influencing W e,max of the spray-layer was conducted and found that the W e,max of the spray layer increased with the increase of the lateral pressure coefficient of the stratum,the surround rock grade and the thickness of the spray layer.A multi-factor W e,max standardized fitting function formula was established.A limit state verification formula for the spray layer design based on the energy principle was given,which was used to determine the range of the spray-layer design thickness in the prototype tunnel,which is close to the design values.This verification formula can consider the relationship between the energy-based force and displacement of the spray-layer and the surrounding rock,which can provide a reference for tunnel spray layer design in high energy storage surrounding rock.

关 键 词：隧道工程 能量理论 模型试验 喷层-围岩相互作用 极限应变能 

分 类 号：U25[交通运输工程—道路与铁道工程]