|本期目录/Table of Contents|

[1]宋应潞,潘建平.基于强度折减与刚度退化小净距隧道围岩稳定性研究[J].中国安全生产科学技术,2015,11(9):24-30.[doi:10.11731/j.issn.1673-193x.2015.09.004]
　SONG Ying-lu,PAN Jian-ping.Research on stability of surrounding rock in neighborhood tunnel based on strength reduction method with stiffness degradation[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2015,11(9):24-30.[doi:10.11731/j.issn.1673-193x.2015.09.004]
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基于强度折减与刚度退化小净距隧道围岩稳定性研究
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
11
期数:
2015年9期
页码:
24-30
栏目:
学术论著
出版日期:
2015-09-30

文章信息/Info

Title:
Research on stability of surrounding rock in neighborhood tunnel based on strength reduction method with stiffness degradation
作者:
宋应潞;  潘建平
（江西理工大学 建筑与测绘工程学院，江西 赣州 341000）
Author(s):
SONG Ying-lu;  PAN Jian-ping
（School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China）
关键词:
小净距隧道; 强度折减法; 刚度退化; 围岩稳定性; 塑性区
Keywords:
neighborhood tunnel;  strength reduction method;  stiffness degradation;  stability of surrounding rock;  plastic zone
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2015.09.004
文献标志码:
A
摘要:
运用刚度退化的基本原理和方法，将泊松比ν和弹性模量E进行调整，提出变刚度隧道围岩强度折减法。以某小净距隧道为例，在只调整ν或E、同时调整ν和E、保持ν和E不变4种情况下，探讨了刚度退化对小净距隧道围岩稳定性的影响。结果表明：ν对隧道拱顶下沉、拱底沉降、最大主应力的影响要强于E；隧道两拱脚向内位移随折减系数的增大而增大，内侧拱脚向内位移比外侧拱脚的要大，且在刚度调整时拱脚位移要比保持刚度不变时大；等效塑性应变随折减系数的增大而增大，刚度调整导致等效塑性应变区减小，考虑刚度退化推迟了中夹岩柱塑性区贯通；将变刚度隧道围岩强度折减法应用于小净距隧道工程围岩稳定性评价，可依据安全系数的大小来评判设计的合理性，为支护参数及施工技术的选用提供参考。
Abstract:
Based on the basic principle and method of stiffness degradation, the Poisson’s ratio (v) and elastic modulus (E) were adjusted, and a strength reduction method of surrounding rock in tunnel with variable stiffness was proposed. Taking a certain neighborhood tunnel as example, the influence of stiffness degradation on stability of surrounding rock in neighborhood tunnel was discussed under four conditions, such as only adjusting v or E, adjusting v and E at the same time, and keeping the v and E constant. The results showed that the v has stronger influence on arch settlement, dome settlement, and the maximum principal stress than E. The higher of the reduction factor, the inwards displacement of tunnel arch springing is greater. The displacement of inside arch springing is bigger than that of outside arch springing, and the displacement under the condition of stiffness adjustment is greater than that keeping stiffness constant. The equivalent plastic strain increases with the growth of reduction factor. The stiffness adjustment leads to the decrease of equivalent plastic strain zone. Considering the stiffness degradation, the transfixion of interval pillar plastic zone is delayed. When the strength reduction method of surrounding rock in tunnel with variable stiffness is used to stability evaluation of surrounding rock in neighborhood tunnel, the rationality of design can be judged according to the size of safety factor, so as to provide references for the selection of support parameters and construction technology.

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备注/Memo

备注/Memo:
收稿日期：2015-05-27
作者简介：宋应潞，硕士研究生。
通讯作者：潘建平。
基金项目：江西省科技支撑计划资助项目（20133BBG70103）
更新日期/Last Update: 2015-09-30