基于损伤扩容理论的圆形隧洞围岩松动圈位移计算方法

doi:10.3973/j.issn.2096-4498.2019.01.004

隧道建设（中英文） ›› 2019, Vol. 39 ›› Issue (1): 40-47.DOI: 10.3973/j.issn.2096-4498.2019.01.004

基于损伤扩容理论的圆形隧洞围岩松动圈位移计算方法

沈才华^{1, 2}，古文博^{1, 2}，李鹤文^{1, 2}，王媛^{1, 2}，张永进³，赖勇³

(1. 岩土力学与堤坝工程教育部重点实验室，江苏南京 210098；  2. 河海大学土木与交通学院，江苏南京 210098；  3. 浙江省水利水电勘测设计院，浙江杭州 310002)

收稿日期:2018-07-06 修回日期:2018-08-27 出版日期:2019-01-20 发布日期:2019-02-01
作者简介:沈才华(1976—)，男，江苏宜兴人，2008年毕业于东南大学，岩土工程专业，博士，副研究员，主要从事岩土工程、地下工程等领域的教学与科研工作。Email: shencaihua@163.com。
基金资助:
国家自然科学基金重点项目(201841830110)；国家博士后基金(2015M571656)；浙江省水利厅科技项目(RA1503)；浙江省交通运输厅科技计算项目(2016008)；国家重点研发计划子课题2017YFC1501102

Calculation Method for Displacement of Loose Circle of Circular  Tunnel Surrounding Rock Based on Theory of Damage and Dilation

SHEN Caihua^{1, 2}, GU Wenbo^{1, 2}, LI Hewen^{1, 2}, WANG Yuan^{1, 2}, ZHANG Yongjin³, LAI Yong³

(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Nanjing 210098,  Jiangsu, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, Jiangsu, China; 3. Zhejiang Design Institute of Water Conservancy & HydroElectric Power, Hangzhou 310002, Zhejiang, China)

Received:2018-07-06 Revised:2018-08-27 Online:2019-01-20 Published:2019-02-01

摘要/Abstract

摘要：

为解决传统弹塑性力学理论在计算时未考虑实际围岩卸载时的扩容效应导致的位移设计值预测误差较大的问题，通过考虑不同应力状态下围岩损伤扩容系数的不同，建立圆形隧洞开挖松弛位移的分层总和法理论计算方法，提出以洞壁处围岩损伤扩容状态为控制值的围岩开挖位移预警值计算方法。结合分水江引水隧洞工程实例，对不同围岩级别、不同埋深、洞壁围岩的不同扩容效应（即不同支护状态）时圆形隧洞开挖后洞壁围岩位移变化规律进行分析，提出以圆形隧洞为基础的围岩预警值理论计算经验公式。由实际应用结果表明：考虑扩容效应的围压位移分层总和法计算值比弹塑性理论计算值大3倍以上，计算结果更符合实际情况。

关键词: 圆形隧洞, 弹塑性理论, 损伤扩容理论, 分层总和法, 松动圈位移

Abstract:

The design value of predicted displacement of surrounding rock calculated by traditional elastoplastic mechanics theory is large due to its ignorance on dilation effect during surrounding rock unloading. Hence, a theoretical calculation method of relaxation displacement of circular tunnel excavation by stratified summation method is established by considering the difference of damage and dilation coefficient of surrounding rock under different stress states; and a method for calculating the early warning value of surrounding rock excavation displacement is put forward, which takes the damage and capacity of surrounding rock at the wall of the tunnel as the control values. And then the displacement of surrounding rock of waterdiversion tunnel crossing Fenshui River is analyzed under the conditions of different grades of surrounding rocks, different buried depths, and different dilation effects (corresponding to different supporting states); and an empirical formula for calculating the early warning value of surrounding rock of circular tunnel is put forward. The calculated value of the method based on stratified summation of confining pressure displacement considering the dilation effect is more than three times larger than that calculated by elastoplastic theory, and the calculated results are more in line with the actual situation.

Key words: circular tunnel, elastoplastic theory, damage and dilation theory, stratified summation method, displacement of loose circle

中图分类号:

U 455

沈才华，古文博，李鹤文，王媛，张永进，赖勇. 基于损伤扩容理论的圆形隧洞围岩松动圈位移计算方法[J]. 隧道建设, 2019, 39(1): 40-47.

SHEN Caihua, GU Wenbo, LI Hewen, WANG Yuan, ZHANG Yongjin, LAI Yong. Calculation Method for Displacement of Loose Circle of Circular  Tunnel Surrounding Rock Based on Theory of Damage and Dilation[J]. Tunnel Construction, 2019, 39(1): 40-47.

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基于损伤扩容理论的圆形隧洞围岩松动圈位移计算方法

Calculation Method for Displacement of Loose Circle of Circular  Tunnel Surrounding Rock Based on Theory of Damage and Dilation

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