摘要
为了探究砂岩在酸碱环境干湿循环作用下的动态力学特性,分别进行了不同酸碱环境下(pH=3、7、11)和不同干循环次数(0、5、10、15次)耦合作用下砂岩试件的物理、动态力学试验,并借助红外热成像技术进一步评定了砂岩的损伤表现。研究表明:酸性溶液和干湿循环的耦合作用使试件孔隙的发育得到加速;但15次循环之后,试件孔隙率的增长速度放缓。砂岩的峰值应力与弹性模量在干湿循环10次后,劣化现象最为明显。并随着干湿循环次数的增加,主应力面与破裂面的夹角逐渐增大,试件破坏形式由脆性破坏向塑性破坏转变,红外热成像技术佐证了砂岩在受酸碱循环作用下试件内部发生的损伤,并根据热成像技术可进一步评定砂岩损伤表现。研究结果对隧道掘进、巷道开挖、地铁和水下工程等施工作业提供参考和借鉴。
In order to investigate the dynamic mechanical properties of sandstone under the action of dry and wet cycles in acid-base environment,physical and dynamic mechanical tests of sandstone specimens under the coupling action of different acid-base environments(pH=3,7,11)and different number of dry cycles(0,5,10,15 cycles)were conducted,and the damage performance of sandstone was further evaluated with the help of infrared thermography.Result show that the coupling effect of acidic solution and wet and dry cycles accelerated the development of pore space in the specimens.However,the growth rate of porosity in the specimens slowed down after 15 cycles.The deterioration of peak stress and elastic modulus of sandstone was most obvious after 10 cycles of wet and dry cycles.And with the increase of the number of dry and wet cycles,the angle between the main stress surface and the rupture surface gradually increased,and the damage form of the specimen changed from brittle damage to plastic damage.Infrared thermography technology corroborated the damage occurred inside the specimen under the action of acid and alkali cycles,and the sandstone damage performance could be further evaluated according to the thermography technology.The results of the study can be used as a reference for tunneling,roadway excavation,subway and underwater construction.
作者
方江华
倪苏黔
王凤瑶
姜平伟
FANG Jiang-hua;NI Su-qian;WANG Feng-yao;JIANG Ping-wei(School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;Beijing UniConstruction Group Co., Ltd., Beijing 100101, China)
出处
《科学技术与工程》
北大核心
2021年第31期13476-13483,共8页
Science Technology and Engineering
基金
国家安全监管总局安全生产重大事故防治关键技术科技项目(Anhui-003-016AQ)
淮南市科技计划重大创新平台及创新人才团队专项(2017A055)。
关键词
砂岩
酸碱性
干湿循环
物理力学试验
损伤机理
sandstone
acid-base property
dry-wet cycle
physical and mechanical test
damage mechanism
