酸性干湿循环作用下花岗岩-喷射混凝土力学特性及其本构模型  

Mechanical Properties and Constitutive Model of Granite-Shotcrete Subjected to Dry-Wet Cycle in Acidic Environment

作　　者：李曙光 尹训江 谢江胜[1] 仲维玲[1] 霍润科[2] 苗子臻 祁浩 LI Shuguang;YIN Xunjiang;XIE Jiangsheng;ZHONG Weiling;HUO Runke;MIAO Zizhen;QI Hao(China Railway 20^(th) Bureau Group Co.Ltd.,Xi’an Shaanxi 710016,China;Xi’an University of Architecture and Technology,Xi’an Shaanxi 710055,China)

机构地区：[1]中铁二十局集团有限公司,陕西西安710016 [2]西安建筑科技大学,陕西西安710055

出　　处：《铁道建筑技术》2022年第11期1-5,共5页Railway Construction Technology

基　　金：中国博士后科学基金资助项目(2020M673525);陕西省自然科学基础研究计划青年项目(2022JQ-563);中国铁建股份有限公司科技研发计划项目(2021-B10)。

摘　　要：为探究酸性环境干湿循环交替作用对围岩-喷射混凝土的力学劣化特性,开展了酸循环作用下花岗岩-喷射混凝土二元体试件的劈裂抗拉力学试验,分析了随着酸循环次数的增加,二元体的物理力学变化特性,基于Weibull强度理论建立了花岗岩-喷射混凝土试件劈拉本构模型。结果表明:花岗岩-喷射混凝土试件弹性模量及峰值应力随着酸循环次数增加而逐渐减小,峰值强度及弹性模量与循环次数呈指数关系,峰值应变与循环次数呈线性关系;建立的统计损伤本构模型适用于受酸腐蚀干湿循环作用下花岗岩-喷射混凝土试件劈拉力学特性分析,对于研究酸性环境干湿交替作用下二元体的力学演化规律具有重要意义。To investigate the mechanical deterioration characteristics of surrounding rock and shotcrete by alternating dry and wet cycles in acidic environment,the splitting tensile mechanical test of granite-sprayed concrete integrated two-media specimens under acid cycle was carried out.The physical and mechanical characteristics of the two media in one body were analyzed with the increase of acid cycle times.A split-pull constitutive model of granite-sprayed concrete specimens was established based on Weibull strength theory.The results show that the elastic modulus and peak stress in granite-sprayed concrete specimens decrease with increasing number of acid cycles.The peak strength and elastic modulus have an exponential relationship with the number of cycles,and the peak strain has a linear relationship with the number of cycles.The statistical damage constitutive model established in this paper is suitable for the analysis of split-pull mechanical properties of granite-sprayed concrete specimens under the action of acid-corrosion dry-wet cycles.It is of great significance to study the mechanical evolution law of one body and two media under the action of alternating dry and wet in an acidic environment.

关 键 词：酸腐蚀 干湿循环 岩-砼 力学特性 本构模型 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]