超大跨度扁平地下洞室变形控制标准研究

陶连金; 黄琳昆; 石城; 张乃嘉

doi:10.3973/j.issn.2096-4498.2022.01.002

隧道建设 >

2022 , Vol. 42 >Issue 1: 9 - 15

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.01.002

研究与探索

超大跨度扁平地下洞室变形控制标准研究

陶连金 ,
黄琳昆 ,
石城 ,
张乃嘉

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（北京工业大学城市与工程安全减灾教育部重点实验室，北京 100124）

陶连金（1964—），男，北京人，1996年毕业于东北大学，土木工程专业，博士，教授，主要从事岩土工程与地下工程方面的研究工作。E-mail: ljtao@bjut.edu.cn。

网络出版日期: 2022-01-28

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Deformation Control Standards for Super-Large-Span Flat Underground Cavern

TAO Lianjin ,
HUANG Linkun ,
SHI Cheng ,
ZHANG Naijia

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(Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China)

Online published: 2022-01-28

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摘要

为解决目前超大跨度扁平地下洞室(跨度大于50 m)变形控制尚无明确规范的问题，基于某工程实例，采用理论解析与数值模拟相结合的方法，对大跨洞室变形控制标准进行研究。以围岩应变作为岩体强度指标评判大跨洞室稳定性，建立洞室拱顶沉降量S与围岩极限应变ε的关系，并提出以“沉降跨度比”作为大跨洞室沉降变形控制指标，给出适用于各施工阶段的变形控制标准，并建立变形控制标准分级管理办法。研究结果表明： 1）大跨洞室沉降变形允许值与洞室几何形状、围岩强度特性相关； 2）结合本工程大跨洞室“分部开挖-预留岩柱”的开挖方案，洞室变形主要发生在大跨洞室阶段。

关键词： 超大跨度扁平洞室; 矢跨比; 极限应变; 变形控制标准; 数值模拟

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陶连金 , 黄琳昆 , 石城 , 张乃嘉 . 超大跨度扁平地下洞室变形控制标准研究[J]. 隧道建设, 2022 , 42(1) : 9 -15 . DOI: 10.3973/j.issn.2096-4498.2022.01.002

Abstract

There is no relevant normative guidance for the construction deformation control of the super-large-span flat underground cavern with a span greater than 50 m. Therefore, the theoretical analysis and numerical simulation methods are used to study the deformation control standards for large-span caverns based on an actual project. To assess the stability of a large-span cavern, the surrounding rock strain is used as a rock mass strength index. The settlement-span ratio is proposed as the deformation control standard, and a correlation between cavern crown settlement and rock mass ultimate strain ε is proposed. Furthermore, the deformation control standards applicable to each excavation stage are proposed, and the classification management method for deformation control standards is developed. The results show the following: (1) The allowable settlement deformation of a large-span cavern is related to the geometry of the cavern and the strength characteristics of surrounding rocks. (2) Regarding the excavation scheme of partial excavation and reserved rock pillar for the case study of the large-span cavern, the deformation of the cavern mainly occurs in the large-span cavern stage.

Key words： super-large-span flat underground cavern; rise-span ratio; ultimate strain; deformation control standards; numerical simulation

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