| 温湿耦合作用下喷射混凝土孔隙结构与强度试验研究 |
| |
| 引用本文： | 宿辉,尹文强,王翀,刘世伟,王云飞.温湿耦合作用下喷射混凝土孔隙结构与强度试验研究[J].隧道建设,2020,40(12):1700-1708. |
| |
| 作者姓名： | 宿辉 尹文强 王翀 刘世伟 王云飞 |
| |
| 作者单位： | （1. 河北工程大学水利水电学院， 河北 邯郸 056000； 2. 中国电建集团北京勘测设计研究院有限公司， 北京 100024； 3. 陆地交通气象灾害防治技术国家工程实验室， 云南 昆明 650200； 4. 河南理工大学土木工程学院， 河南 焦作 454000 ） |
| |
| 基金项目： | 国家自然科学基金资助项目(U1604142)； 陆地交通气象灾害防治技术国家工程实验室开放基金(NEL-2019-03)； 河北省自然科学基金(E2018402263) |
| |
| 摘 要： | 为分析隧洞围岩温度和洞室环境湿度对喷射混凝土细观孔隙结构特征及单轴抗压强度的影响，采用室内CT扫描和无侧限压缩试验的方法，测试不同围岩温度、湿度条件下喷射混凝土细观孔隙结构的分布特征和单轴抗压强度，建立基于细观结构参数的喷射混凝土单轴抗压强度预测模型。研究结果表明： 1）低湿环境（湿度25%）下，高岩温诱发喷射混凝土孔隙结构和力学性能劣化，温度越高劣化影响越显著，喷射混凝土单轴抗压强度可采用Schiller模型预测； 2）高湿环境（湿度95%）下，60 ℃岩温是喷射混凝土力学性能和孔隙结构特征发生劣化转变的临界温度； 3）引入相对湿度影响系数建立的高湿环境喷射混凝土抗压强度预测模型，其预测结果与试验结果较吻合。
|
| 关 键 词： | 隧洞 温湿耦合 喷射混凝土 孔隙结构 抗压强度 预测模型 |
Experimental Study on Pore Structure Characteristics
and Strength of Shotcrete under Coupling Effect of Temperature and Humidity |
| |
| SU Hui,YIN Wenqiang,WANG Chong,LIU Shiwei,WANG Yunfei.Experimental Study on Pore Structure Characteristics
and Strength of Shotcrete under Coupling Effect of Temperature and Humidity[J].Tunnel Construction,2020,40(12):1700-1708. |
| |
| Authors: | SU Hui YIN Wenqiang WANG Chong LIU Shiwei WANG Yunfei |
| |
| Institution: | (1.College of Water Resources and Hydropower, Hebei
University of Engineering,Handan 056000,Hebei,China;2.China Power Construction Group Beijing Survey Design and Research Institude Co., Ltd., Beijing 100024,China;3.National
Engineering Laboratory for Land Meteorological Disaster Prevention Technology,Kunming 650200,Yunnan,China;4.School of Civil
Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China) |
| |
| Abstract: | In order to analyze the influence of surrounding rock
temperature and humidity on the micro pore structure characteristics and
uniaxial compressive strength of shotcrete, indoor CT scanning and unconfined
compression test are carried out, and the prediction model of uniaxial
compressive strength of shotcrete is established based on micro structural
parameters. The results show that: (1) Under the low humidity environment (with
humidity of 25%), high rock temperature induces the deterioration of shotcrete
pore structure and mechanical properties, and the higher the temperature, the
more obvious the effect of deterioration; the uniaxial compressive strength of
shotcrete is predicted by Schiller model. (2) Under the high humidity
environment (with humidity of 95%), 60 ℃ rock temperature is the
critical temperature for deterioration of mechanical properties and pore
structure characteristics of shotcrete. (3)The prediction model of compressive
strength of shotcrete in high humidity environment is established by
introducing the influence coefficient of relative humidity, of which the
prediction results are in good agreement with the test results. |
| |
| Keywords: | |
|
| 点击此处可从《隧道建设》浏览原始摘要信息 |
| 点击此处可从《隧道建设》下载免费的PDF全文 |
|
