拉剪应力下单裂隙岩体受温差影响的强度研究  

Study on the strength of single fracture rock mass affected by temperature differences under tensile-shear stress

作　　者：张岩[1] 赖乾隆 任翔[1] ZHANG Yan;LAI Qianlong;REN Xiang(School of Architecture and Civil Engineering,Xi′an University of Science and Technology,Xi′an 710054,Shaanxi,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《山东大学学报(工学版)》2025年第2期143-155,164,共14页Journal of Shandong University(Engineering Science)

基　　金：国家自然科学基金资助项目(51509200);陕西省重点研发计划资助项目(2024GX-YBXM-375)。

摘　　要：为研究温度差对拉剪应力状态下裂隙岩体力学特性的影响规律,从高岩温隧洞、边坡等工程实际中出现的岩体拉剪破坏现象出发,基于能量及线弹性断裂力学理论,推导出单裂隙岩体在温差下裂隙强度的表达式;并使用数值方法将裂隙倾角、水平压力等因素与温度应力相结合,系统研究了拉剪应力条件下裂隙岩石的强度、裂纹扩展演化机制等。结果表明:在拉剪应力状态下,随着温差由5℃增大到15℃,岩石产生热膨胀,导致裂隙岩体内应力增加。当裂隙倾角从155°接近最大剪切应力180°方向时,主要剪应力更容易作用于裂隙面,使得抵抗剪切的阻力减小,初裂强度降低,从而推动裂隙剪切并发生扩展。本研究揭示了拉剪应力状态下单裂隙岩体在温差条件下受多因素影响的强度特性规律,有助于工程师在设计阶段对岩体的稳定性进行初步评估,从而制定相应的施工方案和预防措施。In order to study the effect of temperature difference on the mechanical properties of fractured rock mass under tensileshear stress,the expression of fracture strength of single fractured rock mass under temperature difference was derived based on energy and linear elastic fracture mechanics theory from the phenomenon of rock mass tensile-shear failure in high rock temperature tunnels and slopes.The strength of fractured rock and the mechanism of crack growth and evolution under tensile and shear stress were systematically studied by combining the factors of fracture inclination,horizontal pressure and temperature stress with numerical method.The results showed that under tensile-shear stress conditions,as the temperature difference increasing from 5℃to 15℃,the rock thermal expansion occured and the internal stress of fractured rock mass increased.When the fracture inclination angle was from 155°to the direction of the maximum shear stress of 180°,the main shear stress was easier to act on the fracture surface,which reduced the resistance to shear and the initial crack strength,thus promoted the fracture shear and spreaded.This study revealed the strength characteristics of single fissure rock mass under the condition of temperature difference influenced by many factors,which was helpful for engineers to make preliminary assessment of the stability of rock mass in the design stage,so as to formulate corresponding construction plans and preventive measures.

关 键 词：单裂隙岩体 温差 裂隙倾角 拉剪应力 初裂强度 

分 类 号：TU452[建筑科学—岩土工程]