摘要
研究库水位反复升降对边坡稳定性的影响具有重要意义,结合水-岩相互作用课题,对不同干湿循环次数作用下的泥质砂岩进行单轴压缩试验和三轴压缩试验。试验结果表明:在干湿循环作用下,泥质砂岩的峰值强度的劣化程度>黏聚力的劣化程度>内摩擦角的劣化程度,随着干湿循环次数增加其力学参数劣化程度加剧,结合岩土塑性力学中广泛应用的Drucker-Prager准则(简称D-P准则),提出了考虑干湿循环作用的不同围压下泥质砂岩的D-P屈服准则,通过修正的D-P屈服函数计算的泥质砂岩不同围压下的理论峰值与试验值的对比,得到两者误差控制在10%以内,考虑干湿循环作用的泥质砂岩的D-P屈服准则在实际应用中是可行的,为工程中获得任意围压下岩石的破坏强度提供了理论依据。
It is of great significance to study the effect of repeated fluctuation of reservoir water level on the stability of slope. Considering the problem of water-rock interaction, uniaxial and triaxial compression tests were conducted on argillaceous sandstone at different dry-wet cycles, respectively. The results show that the deterioration degrees from high to low are as followed： peak strength, cohesion and internal friction angle. Meanwhile, the deterioration degrees of mechanical parameters increase with increasing the times of dry-wet cycles. In combination with Drucker-Prager criterion（D-P criterion） that widely used in geotechnical plastic mechanics, a new D-P yield criterion is put forward for argillaceous sandstone under different confining pressures and dry-wet cycles. By comparing the experimental value with the theoretical peak value calculated by the modified D-P yield criterion, the error is found less than 10 percent. Hence, the D-P yield criterion is feasible for argillaceous sandstone under dry-wet cycles in practical applications. This study provides a theoretical basis for yield strength of rock under the arbitrary confining pressure in practical engineering.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2017年第12期3395-3401,共7页
Rock and Soil Mechanics
基金
2013年国家自然科学基金项目(No.41372356)
2013年国家自然科学基金青年基金(No.51308567)~~
关键词
干湿循环
三轴压缩
D-P屈服准则
峰值强度
泥质砂岩
dry-wet cycle
triaxial compression
Drucker-Prager criteria
peak strength
argillaceous sandstone
