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水-盐作用下红层砂岩声波特性劣化试验
引用本文:原鹏博,杨烜宇,赵天宇. 水-盐作用下红层砂岩声波特性劣化试验[J]. 岩土力学, 2019, 40(1): 227-234. DOI: 10.16285/j.rsm.2017.1035
作者姓名:原鹏博  杨烜宇  赵天宇
作者单位:1. 兰州大学 土木工程与力学学院,兰州 甘肃 730000;2. 兰州大学 西部灾害与环境力学教育部重点实验室,兰州 甘肃 730000;3. 甘肃省交通规划勘察设计院股份有限公司,兰州 甘肃 730030
基金项目:国家重点基础研究发展计划(973计划)项目(No. 2014CB744701);兰州大学西部灾害与环境力学教育部重点实验室开放基金(No. 201403);甘肃省交通运输厅科技项目(No. 2016-02)。
摘    要:

关 键 词:红层砂岩  声波特性  水-岩作用  劣化机制
收稿时间:2017-05-24

Deterioration characteristics of red-bed sandstone acoustic wave properties due to water and salt solution
YUAN Peng-bo,YANG Xuan-yu,ZHAO Tian-yu. Deterioration characteristics of red-bed sandstone acoustic wave properties due to water and salt solution[J]. Rock and Soil Mechanics, 2019, 40(1): 227-234. DOI: 10.16285/j.rsm.2017.1035
Authors:YUAN Peng-bo  YANG Xuan-yu  ZHAO Tian-yu
Affiliation:1. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, China; 2. Key Laboratory of Mechanics on Disaster and Environment in Western China, The Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China; 3. Gansu Provincial Institute of Communications Planning Survey and Design Co., Ltd., Lanzhou, Gansu 730030, China
Abstract:Water-rock interaction is one of the most important causes of surface weathering, structure damage and strength reduction of rock. Water-rock interaction is also a classical problem of research field of rock and soil mechanics. In order to investigate the deterioration characteristics and mechanism of acoustic wave properties of red-bed sandstone in Lanzhou City, Gansu Province, a series of dry-wet cycle tests with different salt solutions is conducted. The research results show that the mass, P-wave and S-wave of red-bed sandstone specimens gradually decrease with the increasing of the number of dry-wet cycles with salt solution, especially with sulphate solution. Furthermore, it is easier for the samples perpendicular to the direction of bedding plane than the samples parallel to the direction of bedding plane to get deteriorated. Based on the P-wave spectrum analysis, the sulphate solution causes more energy loss than the sodium chloride solution. For the same salt solution, there is a highly positive correlation between the energy loss and the salt solution concentration. During the deterioration process, there are two types of deterioration, the end-face pulverization and rupture along the bedding plane. The microstructure analysis indicates that the cementation weakening of mineral particles and void increasing of rock due to the dry-wet cycles with salt solution are the main reasons of degradation of red-bed sandstone acoustic wave properties. Research results have important implications for the long-term slope stability evaluation of red-bed sandstone, and the evaluation and control of weathering disease of stone cultural heritage.
Keywords:red-bed sandstone  acoustic wave properties  water-rock interaction  deterioration mechanism  
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