摘要
为研究加载速率对盐岩剪切强度与变形性质的影响,采用YZW100型直剪试验机对巴基斯坦高纯度盐岩开展了不同法向压力和不同加载速率下的直剪试验,探讨了盐岩的峰值抗剪强度、残余抗剪强度以及剪胀变形的加载率效应.试验结果表明:随着法向荷载等级的增加,盐岩的剪切破坏趋于延性,并伴有明显的剪胀变形.随着加载速率的增加,剪胀变形减小,而盐岩的峰值抗剪强度和残余强度与加载速率的对数呈线性正相关关系.盐岩强度的加载率效应主要由黏聚力的率效应引起,加载速率从0.01mm/s提高至0.10mm/s,盐岩黏聚力从6.34MPa增长至8.55MPa,而内摩擦角从44.35°略减小至43.6°,几乎保持不变.研究结果可供不同注、采速率地下盐岩储气库围岩稳定性分析提供参考.
Based on the direct shear tests at different loading rates, the loading rate effects on shear mechanical properties of salt rock were evaluated in terms of peak shear strength, residual shear strength and dilatancy deformation.The failure model of salt rock tended to ductile failure, with the increase of the normal force.The dilatancy deformation is negatively correlated with the loading rate, while the peak and residual strength shows a positive linear correlation with the logarithm of loading rate.The loading rate effect on shear strength of salt rock is mainly caused by the rate effect on cohesion.The cohesion of salt rock increased from 6.34 MPa to 8.55 MPa, with the loading rate increasing from 0.01 mm/s to 0.1 mm/s, while the internal friction angle decreased slightly from 44.35° to 43.6°,which is almost constant.The results can provide a reference for stability analysis of underground salt rock caves at different injection and production rates.
作者
马林建
薛冰
王德荣
周聪
罗尚奕
MA Linjian;XUE Bing;WANG Derong;ZHOU Cong;LUO Shangyi(State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University of PLA,Nanjing 210007,China;Unit73670 of PLA,Nanjing 210042,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2022年第4期1039-1047,共9页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51774295,11772355)。
关键词
盐岩
直剪试验
剪胀变形
抗剪强度
黏聚力
内摩擦角
率效应
salt rock
direct shear test
dilatancy deformation
shear strength
cohesion
internal friction angle
loading rate effect
