高温水冷后循环加卸载条件下花岗岩的渗透性  

Permeability of granite under cyclic loading and unloading conditions after high temperature water cooling

作　　者：张帆 操旺进[1] 胡大伟 盛谦[2] ZHANG Fan;CAO Wang-jin;HU Da-wei;SHENG Qian(School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China;State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068 [2]中国科学院武汉岩土力学研究所岩土力学和工程国家重点实验室,武汉430071

出　　处：《沈阳工业大学学报》2021年第1期82-90,共9页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(51579093,51479193);中国博士后科学基金项目(2013M531773);国家973计划项目(2015CB057905).

摘　　要：针对水下隧道火灾喷水灭火降温过程中围岩的渗透性问题,对高温水冷后循环加卸载条件下花岗岩的渗透性开展了试验研究.以高温(25、400和900℃)水冷后的花岗岩试样为研究对象,通过轴向压应力循环加卸载过程中气体渗透性试验,研究花岗岩渗透率变化规律.结果表明:轴向压应力循环加卸载试验过程中,花岗岩试样的卸载模量随着高温水冷处理温度升高而减小,随着轴向压应力增大,卸载模量总体呈上升趋势,气体渗透率随温度升高而增大;花岗岩BET比表面积与BJH孔体积在900℃高温水冷后明显减小.Aiming at the permeability problem of surrounding rock during the sprinkler cooling process for the underwater tunnel fire,an experimental study on the permeability of granite under cyclic loading and unloading conditions after high temperature water cooling was conducted.Taking the granite samples after high temperature water cooling at different temperatures(25℃,400℃and 900℃)as the research objects,the change rule of granite permeability was studied through the gas permeability test during the cyclic loading and unloading process under axial compressive stress.The results show that during the process of cyclic loading and unloading test under axial compressive stress,the unloading modulus of granite samples decreases with the increasing treatment temperature of high temperature cooling water,while generally decreases with the increasing axial compressive stress.In addition,the gas permeability increases with the increasing temperature,and the BET specific surface area and BJH pore volume of granite obviously decrease after the high temperature water cooling at 900℃.

关 键 词：花岗岩 水下隧道火灾 高温水冷 循环加卸载 卸载模量 气体渗透率 比表面积 孔径分析 

分 类 号：TU458[建筑科学—岩土工程]