裂隙岩体小净距超大断面隧道围岩非连续变形分析

贺鹏; 李术才; 李利平; 许振浩; 石少帅; 陈云娟

doi:10.11779/CJGE201810016

裂隙岩体小净距超大断面隧道围岩非连续变形分析 English Version

1. 山东大学岩土与结构工程研究中心,山东济南 250061;
2. 山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛 266590

基金项目: 国家重点研发计划项目子课题（2016YFC0801607）; 国家自然科学基金项目（51679131）; 山东大学基本科研业务费资助项目（交叉学科培育）（2016JC002）

详细信息

作者简介:
贺鹏(1988- ),男,博士研究生,主要从事隧道岩体结构稳定性分析、动态评估及控制研究。E-mail：hepenghank@163.com。

通讯作者:
李利平，E-mail：yuliyangfan@163.com

中图分类号: TU457
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出版历程
- 收稿日期: 2017-07-04
- 发布日期: 2018-10-24

Discontinuous deformation of surrounding rock for small-space tunnel with super-large section in jointed rock mass

1. Geotechnical and Structural Engineering Research Center, Shandong University, Ji'nan 250061, China;
2. Shandong Province Key Lab of Civil Engineering Disaster Prevention and Mitigation, Shangdong University of Science and Technology, Qingdao 266590, China

摘要

摘要: 由于现有隧道规范不足与设计、施工经验匮乏,裂隙岩体中小净距超大断面隧道的围岩稳定性分析与中夹岩柱变形破坏特征及其支护方案优化仍是大型隧道工程建设中遇到的棘手难题。以济南市东南二环绕城高速大岭超大断面隧道为工程依托,通过对掌子面岩体结构信息的精细化描述,获取各评定指标分布概型,并应用Monte Carlo法生成符合围岩等级评价指标分布概型的大量随机数,通过归纳统计获得隶属各围岩亚级分级的概率分布,由此对岩体质量进行了稳健评估。此外,用改进的非连续变形分析(DDARF)法对大岭隧道浅埋小净距段围岩的变形破坏规律及裂隙演化过程进行了数值模拟;以裂隙扩展破碎区贯通与否作为中夹岩柱稳定性的评定依据,分别针对无锚、有锚支护条件下的围岩稳定性状况及变形特征进行了对比分析。结果表明：无锚支护条件下,隧道后行洞开挖对先行洞的裂隙扩展及变形有一定影响,但不明显;而锚杆支护则可显著约束围岩尤其是中夹岩柱的裂隙扩展及贯通,锚杆支护条件下二次扰动后先行洞围岩的裂隙扩展情况、变形破坏特征与单洞开挖无异,且系统锚杆支护与中夹岩柱水平加长锚杆支护对裂隙演化的控制效应无较大区别。研究结果对裂隙岩体中小净距超大断面隧道围岩的支护方案优化有实际指导意义。
- 裂隙岩体 /
- 小净距超大断面隧道 /
- 改进非连续变形（DDARF）法 /
- 中夹岩柱 /
- 围岩等级可靠概率
Abstract: Due to insufficiency of the existing specifications and lack of experience in design and construction, the stability of the surrounding rock, deformation characteristics and optimization of supporting schemes of middle rock pillar for small-space tunnels in jointed rock mass are still a tough problem encountered during the construction of tunnels with super-large section. Based on the Daling tunnel of ring expressway in Jinan, the actual distribution information and the related probability distribution model for joints and fractures are obtained. Then lots of random numbers that obey the probabilistical distribution models for these evaluation indexes can be produced by the Monte Carlo method, and the corresponding random rating-values of these evaluation indexes are also gained. The distribution probability affiliated with different rock mass levels can be attained through the inductive statistics, and the robust evaluation of the surrounding rock classification is carried out. Moreover, an improved discontinuous deformation analysis method is adopted to simulate the deformation failure mechanism and fracture evolution process of the surrounding rock in Daling tunnel with small space. Taking the crack propagation zone as the estimate basis for the stability of the middle rock pillar, the comparative analysis of surrounding rock stability with or without anchor supports is carried out. The results reveal that the excavation of the following tunnel hole has an influence on the crack extension and deformation of the advanced tunnel hole (but less obvious), and the anchor bolting can significantly restrict the crack extension and penetration of the surrounding rock, especially for the middle rock pillar. Under the anchor supports, the crack extension situation and deformation failure characteristics of the advanced tunnel hole with secondary disturbance are almost indistinguishable from those of single-hole excavation only, and there is little difference of the controlling effect on

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