理论与试验研究

不同裂隙倾角花岗岩热-力耦合卸荷破坏特性

  • 曾维豪 ,
  • 陈正红 ,
  • 陈秋南 ,
  • 熊广为 ,
  • 陈英
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  • 1.湖南科技大学 土木工程学院,湖南 湘潭 411100;
    2.长沙理工大学 交通运输工程学院,长沙 410000
曾维豪(2000—),男,湖南长沙人,硕士生,主要从事岩体力学,地下工程开挖等方向的研究。E-mail:weihaozeng@yeah.net
陈正红(1992—),女,湖南湘潭人,博士,副教授,主要研究方向为地下工程开挖、岩体力学、岩石断裂与裂纹扩展理论等。E-mail:zhchen@hnust.edu.cn

收稿日期: 2025-04-29

  网络出版日期: 2026-04-28

基金资助

国家自然科学基金(52004328);湖南省自然科学基金(2022JJ40149);湖南省教育厅科学研究项目(22B0518)

Thermal-Force Coupled Unloading Failure Characterization in Granite with Different Fracture Inclinations

  • Zeng Weihao ,
  • Chen Zhenghong ,
  • Chen Qiunan ,
  • Xiong Guangwei ,
  • Chen Ying
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  • 1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411100, P.R. China;
    2. School of Transportation Engineering, Changsha University of Science and Technology, Changsha 410000, P.R. China

Received date: 2025-04-29

  Online published: 2026-04-28

摘要

川藏铁路沿线隧道围岩常存在大量不同倾角的构造裂隙,且常处于高地温和高应力耦合环境。为研究裂隙倾角对高温和高应力耦合下硬岩卸荷破裂特征的影响,采用室内试验和数值模拟方法,通过卸荷试验对川藏铁路某隧道花岗岩试样在50 ℃实时温度场下的卸荷破裂特征进行了分析。结果表明:卸荷强度随裂隙倾角的增大而增大,当裂隙倾角为0°时,50 ℃实时温度场下试样的卸荷强度明显小于室温下的卸荷强度;卸荷条件下裂隙试样具有较强的张性破坏特征,且裂隙倾角为30°的试样在50 ℃实时温度场下的体积扩容现象更为明显;裂隙倾角为0°的试样在卸荷破坏时产生贯穿预裂隙中心的贯穿裂纹;50 ℃实时温度场下,裂隙倾角越大,试样在卸荷过程中微裂纹发育越分散,预裂隙倾角越小,裂纹发育加速点出现的时间越早。

本文引用格式

曾维豪 , 陈正红 , 陈秋南 , 熊广为 , 陈英 . 不同裂隙倾角花岗岩热-力耦合卸荷破坏特性[J]. 地下空间与工程学报, 2026 , 22(2) : 517 -527 . DOI: 10.20174/j.JUSE.2026.02.13

Abstract

A large number of different inclinations of tectonic fracture exist for the Sichuan-Tibet Railway along the tunnel peripheral rock, and often in the high ground temperature and high stress coupling environment. In order to study the influence of fracture inclination on the unloading failure characteristics of hard rock under high temperature and high stress coupling, this paper analyzes the unloading rupture characteristics of granite specimens of a tunnel of Sichuan-Tibet Railway under 50 ℃ real-time temperature field through unloading test by adopting indoor test and numerical simulation method. The results show that: the unloading strength decreases with the increase of fracture inclination angle, when the fracture inclination angle is 0°, the unloading strength of the specimen under the 50 ℃ real-time temperature field is obviously smaller than the unloading strength at room temperature; the fracture specimen under the unloading condition has strong tensile damage characteristics, and the dilatancy phenomenon of the specimen under the 50 ℃ real-time temperature field is more obvious when the fracture inclination angle is 30°; When the fracture inclination angle is 0°, a penetrating fracture through the center of the pre-fracture is generated; under the real-time temperature field of 50 ℃, the larger the fracture inclination angle is, the more dispersed microcracks are developed in the unloading process of the specimen, and the smaller the inclination angle is of the pre-fracture, the earlier the accelerated point of fracture development occurs.

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