Effect of pH Value on Static Uniaxial Mechanical Properties of Sandstone under Dry-Wet Cycle

Abstract

Abstract: In order to study the effect of dry-wet cycles of solutions with different pH values on the deterioration of mechanical properties of sandstone, four solutions with pH values of 3, 5, 6.5 (distilled water) and 7 were used to perform dry-wet cycles on sandstone. Sandstone specimens with 0 times (dry state), 1 times, 10 times and 20 times of dry-wet cycles were subjected to longitudinal wave velocity measurement, water absorption test, XRD test and uniaxial compression test. Test results show that under the same pH value of the solution, the uniaxial compressive strength of sandstone specimens decreases gradually with the increase of dry-wet cycles. When the number of dry-wet cycles is the same, as the pH value of solution decreases, longitudinal wave velocity of sandstone specimens decreases, water absorption gradually increases, the internal mineral composition changes, and uniaxial compressive strength gradually decreases and tends to be stable. The deterioration of sandstone specimens under dry-wet cycles of acidic solution are more serious than that of neutral solution, and the lower the pH value is, the greater the deterioration is.

Key words: dry-wet cycle, pH value, deterioration, static, uniaxial compressive strength

CLC Number:

TU452

YUAN Pu, BU He, WEI Ningning. Effect of pH Value on Static Uniaxial Mechanical Properties of Sandstone under Dry-Wet Cycle[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2232-2239.

References

[1] 汤连生,王思敬.水-岩化学作用对岩体变形破坏力学效应研究进展[J].地球科学进展,1999,14(5):433-439.
TANG L S, WANG S J. Progress in the study on mechanical effect of the chemical action of water rock on deformation and failure of rocks[J]. Advance in Earth Sciences, 1999, 14(5): 433-439 (in Chinese).
[2] 王周锋,郝瑞娟,杨红斌,等.水岩相互作用的研究进展[J].水资源与水工程学报,2015,26(3):210-216.
WANG Z F, HAO R J, YANG H B, et al. Research progress on water-rock interaction[J]. Journal of Water Resources and Water Engineering, 2015, 26(3): 210-216 (in Chinese).
[3] 刘新荣,李栋梁,王震,等.酸性干湿循环对泥质砂岩强度特性劣化影响研究[J].岩石力学与工程学报,2016,35(8):1543-1554.
LIU X R, LI D L, WANG Z, et al. Study on the influence of acidic dry-wet cycle on the deterioration of the strength characteristics of argillaceous sandstone[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(8): 1543-1554 (in Chinese).
[4] 刘新荣,傅晏,郑颖人,等.水岩相互作用对岩石劣化的影响研究[J].地下空间与工程学报,2012,8(1):77-82+88.
LIU X R, FU Y, ZHENG Y R, et al. A review on deterioration of rock caused by water-rock interaction[J]. Chinese Journal of Underground Space and Engineering, 2012, 8(1): 77-82+88 (in Chinese).
[5] 袁璞,马冬冬.干湿循环与动载耦合作用下煤矿砂岩损伤演化及本构模型研究[J].长江科学院院报,2019,36(8):119-124.
YUAN P, MA D D. Damage evolution and constitutive model of coalmine sandstone under coupling wetting-drying cycles and dynamic loading[J]. Journal of Yangtze River Scientific Research Institute, 2019, 36(8): 119-124 (in Chinese).
[6] 刘新荣,袁文,傅晏,等.化学溶液和干湿循环作用下砂岩抗剪强度劣化试验及化学热力学分析[J].岩石力学与工程学报,2016,35(12):2534-2541.
LIU X R, YUAN W, FU Y, et al. Tests on shear strength deterioration of sandstone under the action of chemical solution and drying-wetting cycles and analysis of chemical thermodynamics[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(12): 2534-2541 (in Chinese).
[7] 韩铁林,陈蕴生,师俊平,等.水化学腐蚀对砂岩力学特性影响的试验研究[J].岩石力学与工程学报,2013,32(s2):3064-3072.
HAN T L, CHEN Y S, SHI J P, et al. Experimental study of mechanical characteristics of sandstone subjected to hydrochemical erosion[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(s2): 3064-3072 (in Chinese).
[8] 王来贵,丁盛鹏,安文博,等.不同溶液环境下砂岩干湿循环损伤特性试验研究[J].实验力学,2020,35(3):521-531.
WANG L G, DING S P, AN W B, et al. Experimental study on dry-wet cycle damage characteristics of sandstone under different solution environments[J]. Journal of Experimental Mechanics, 2020, 35(3): 521-531 (in Chinese).
[9] 马芹永,郁培阳,袁璞.干湿循环对深部粉砂岩蠕变特性影响的试验研究[J].岩石力学与工程学报,2018,37(3):593-600.
MA Q Y, YU P Y, YUAN P. Experimental study on creep properties of deep siltstone under cyclic wetting and drying[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(3): 593-600 (in Chinese).
[10] 罗琼.干湿循环对强风化泥岩崩解与强度特性的影响[J].硅酸盐通报,2020,39(4):1248-1253+1271.
LUO Q. Influence of dry-wet cycle on strength and disintegration of highly weathered mudstone[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(4): 1248-1253+1271 (in Chinese).
[11] 崔凯,吴国鹏,王秀丽,等.不同水岩作用下板岩物理力学性质劣化实验研究[J].工程地质学报,2015,23(6):1045-1052.
CUI K, WU G P, WANG X L, et al. Drying-wetting-saturating experiments for deterioration of physical and mechanical properties of slate[J]. Journal of Engineering Geology, 2015, 23(6): 1045-1052 (in Chinese).
[12] 中华人民共和国水利部.水利水电工程岩石试验规程:SL 264—2001[S].北京:中国水利水电出版社,2001.
Ministry of Water Resources of the People’s Republic of China. Rock test regulations for water conservancy and hydropower engineering:SL 264—2001[S]. Beijing: China Water Resources and Hydropower Press, 2001 (in Chinese).
[13] 中华人民共和国国家质量监督检验检疫总局.煤和岩石物理力学性质测定方法第7部分:单轴抗压强度测定及软化系数计算方:GB/T 23561.7—2009[S].北京:中国标准出版社, 2009.
General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China. Methods for determination of physical and mechanical properties of coal and rocks. Part 7: Determination of uniaxial compressive strength and calculation method of softening coefficient: GB/T 23561.7—2009[S]. Beijing: Standards Press of China, 2009 (in Chinese).
[14] 金解放,程昀,昌晓旭,等.轴向静载对红砂岩中应力波传播特性的影响试验研究[J].岩石力学与工程学报,2017,36(8):1939-1950.
JIN J F, CHENG Y, CHANG X X, et al. Experimental study on stress wave propagation characteristics in red sandstone under axial static stress[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(8): 1939-1950 (in Chinese).
[15] 李春,胡耀青,张纯旺,等.不同温度循环冷却作用后花岗岩巴西劈裂特征及其物理力学特性演化规律研究[J].岩石力学与工程学报,2020,39(9):1797-1807.
LI C, HU Y Q, ZHANG C W, et al. Brazilian split characteristics and mechanical property evolution of granite after cyclic cooling at different temperatures[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(9): 1797-1807 (in Chinese).
[16] 杨建林,王来贵,李喜林,等.水作用下泥岩崩解过程与微观机理研究[J].水资源与水工程学报,2014,25(1):67-70.
YANG J L, WANG L G, LI X L, et al. Research on disintegration process and micro mechanism of mudstone under water action[J]. Journal of Water Resources and Water Engineering, 2014, 25(1): 67-70 (in Chinese).
[17] CAI Y Y, YU J, FU G F, et al. Experimental investigation on the relevance of mechanical properties and porosity of sandstone after hydrochemical erosion[J]. Journal of Mountain Science, 2016, 13(11): 2053-2068.