自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
英文版编委
自然科学版 英文版
英文版首届青年编委

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第51卷    第8期    总第312期    2020年8月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2020)08-2361-12
化学溶液与冻融循环作用下粉砂岩强度衰减及预测模型
王鲁男1, 2,尹晓萌3, 4,韩杰1, 2,王敬泽1

(1. 辽宁石油化工大学 土木工程学院,辽宁 抚顺,113001;
2. 辽宁石油化工大学 辽宁省石油化工特种建筑材料重点实验室,辽宁 抚顺,113001;
3. 武昌理工学院 城市建筑学院,湖北 武汉,430223;
4. 信阳师范学院 建筑与土木工程学院,河南 信阳,464000
)

摘 要: 为探明化学腐蚀与冻胀荷载耦合作用下粉砂岩强度的长期衰减规律,对不同化学溶液浸泡和冻融循环处理后的粉砂岩进行物理性质与细观结构测试,分析溶液pH与冻融循环次数对单轴抗压强度和抗拉强度衰减的影响。根据试验结果,确定冻融作用下粉砂岩强度的衰减参数与溶液pH之间的关系,建立强度衰减预测模型,以揭示复杂现场环境中岩石工程全寿命周期下强度的衰减规律。研究结果表明:随着溶液pH降低、冻融循环次数增加,粉砂岩的质量损失率和峰值应变增大,纵波速度和峰值应力减小,表现出向延性转化的趋势;单轴抗压强度和抗拉强度均随冻融循环次数增加而逐渐衰减,且溶液pH越低,强度衰减幅度越大。这是由于酸性溶液对粉砂岩的冻融损伤劣化具有促进作用,而碱性溶液具有一定抑制作用,且溶液的酸碱性越强,作用就越剧烈。随着溶液pH降低,粉砂岩强度的衰减常数减小、半衰期增大,据此建立的预测模型反映出化学溶液与冻融循环共同作用下粉砂岩强度的非线性衰减特征,强度计算值与实测值一致,证明本模型具有良好的预测效果。

 

关键词: 粉砂岩;化学腐蚀;冻融循环;强度衰减;预测模型

Strength degradation and forecast model of siltstone under combined effect of chemical solutions and freeze-thaw cycles
WANG Lunan1, 2, YIN Xiaomeng3, HAN Jie1, 2, WANG Jingze1

1. School of Civil Engineering, Liaoning Shihua University, Fushun 113001, China;
2. Liaoning Key Laboratory of Petro-chemical Special Building Materials, Liaoning Shihua University, Fushun 113001, China;
3. College of Urban Construction, Wuchang University of Technology, Wuhan 430223, China;
4. Faculty of Architecture and Civil Engineering, Xinyang Normal University, Xinyang 464000, China

Abstract:In order to investigate the long-term degradation of siltstone strength influenced by chemical corrosion and frost heaving force, a series of physical tests and meso-structure observations were carried out on the siltstone treated by the chemical solutions with various pH and the freeze-thaw cycles. The combined effect of solution pH and freeze-thaw cycles on the degradation of uniaxial compressive strength and tensile strength of the siltstone was emphatically analyzed. Based on the test results, the influence of solution pH on the decay parameters of siltstone strength was investigated, and then a decay forecast model was proposed to reveal the degradation of rock strength in total life cycle facing complex field environment. The results show that the mass loss rate and the peak strain of siltstone specimens increase with decreasing solution pH and increasing freeze-thaw cycles, while the P-wave velocity and the peak stress decrease. The specimens tend to be ductile in the freeze-thaw conditions. Moreover, the degradation of uniaxial compressive strength and tensile strength increases as the freeze-thaw cycles increase, and lower solution pH corresponds to greater strength degradation. It is because the acidic solutions have an accelerating effect on the freeze-thaw damage of the siltstone specimens, but the alkaline solutions have a decelerating effect. Enhancing the acidity or alkalinity of the solutions can result in a more dramatic effect. In addition, the decay constants of siltstone strength decrease with the decrease of solution pH, while the half-life value increases. The proposed forecast model exhibits a nonlinear degradation characteristic of siltstone strength under the combined effect of chemical solutions and freeze-thaw cycles. The calculated strength values are consistent with the measured values, which verifies that the model has a good predictive effect.

 

Key words: siltstone; chemical corrosion; freeze-thaw cycle; strength degradation; forecast model

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号