酸性溶液中砂岩声波特性变化规律的试验研究  

Acoustic properties variation analysis of the tandstone in acidic solution

作　　者：霍润科[1] 王强 王博[1] 辛宏伟[1] 李曙光[1] 

机构地区：[1]西安建筑科技大学土木学院,陕西西安710055 [2]海马(郑州)房地产有限公司,河南郑州450000

出　　处：《西安建筑科技大学学报（自然科学版）》2016年第1期41-46,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(41172237);陕西省教育厅专项基金项目(11JK0947)

摘　　要：波速与岩石的物理力学参数具有较好的相关性,超声波检测技术被越来越多的应用到岩石物理性质的研究中.利用超声波检测技术的纵波波速、振幅以及频谱图等参数,对砂岩在不同HCl溶液和H_2SO_4溶液浸泡时段的波速变化规律进行了跟踪研究.实验发现酸对砂岩的腐蚀速率呈现出一定的阶段性特征;酸性较强时,酸的种类对腐蚀影响较大,酸性较弱时,酸的浓度对腐蚀影响较大;腐蚀后,烘干试样孔隙率增大波速下降,下降最高为2.5%,而浸泡试样孔隙被液体填充后砂岩试样趋于均匀,从而使波速增大,最大变化率为16.65%;HCl和H_2SO_4溶液中试样的振幅变化规律与波速相似,呈现一定的阶段性特性,其中HCl溶液中试样的振幅下降66.7%,而H_2SO_4溶液为57.9%;经腐蚀后试样波形发生畸变,主频衰减,HCl溶液浸泡试样波形变化和主频衰减程度较大于H_2SO_4溶液浸泡试样.Velocity has a positive correlation with the physical and mechanical parameters of rock,and ultrasonic inspection techniques are increasingly applied to the study of the physical properties of rocks.The velocity variation of sandstone in different HCl solution and H_2SO_4 solution soak period was carried out in a follow-up study through longitudinal wave velocity,amplitude and spectrum parameters of ultrasonic testing techniques.It was found that the corrosion rate of acid to sandstone shows some phase characteristics.The stronger the acid is,the greater impact on corrosion of the type of acid.When the acid is weak,acid concentration shows greater impact on corrosion.The velocity decreased because of the increase of the porosity and defects after corroding decreased down to 2.5%.The sandstone tends to be uniform because the pores are filled with liquid so that the velocity increases and the maximum rate of change is 16.65%.The amplitude variation of sandstone in HCl solution and H_2SO_4 solution is consistent with the velocity showing some stage characteristics.The amplitude of sandstone in HCl solution decreased by 66.7%while it decreased by 57.9%in H_2SO_4 solution.The waveform distorted and frequency attenuated after corroding.The distortion and attenuation of the sandstone is greater in HCl solution than in H_2SO_4 solution.

关 键 词：砂岩 酸性腐蚀 纵波波速 幅值 频谱 

分 类 号：TU451[建筑科学—岩土工程]