考虑干湿循环作用泥质砂岩的强度与破坏准则研究

发布时间：2018-05-14 02:32

本文选题：干湿循环 + 三轴压缩　；参考：《岩土力学》2017年12期

【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。
[Abstract]:It is of great significance to study the influence of repeated rise and fall of reservoir water level on slope stability. Uniaxial compression tests and triaxial compression tests are carried out for shaly sandstone under different dry-wet cycles combined with the subject of water-rock interaction. The test results show that under the action of dry-wet cycle, the deterioration degree of the peak strength of shaly sandstone is the deterioration degree of cohesion, the deterioration of internal friction angle, and the deterioration degree of mechanical parameters is aggravated with the increase of dry-wet cycle times. Based on the Drucker-Prager criterion (D-P criterion) which is widely used in geotechnical plastic mechanics, a D-P yield criterion for shaly sandstone under different confining pressures is proposed. The theoretical peak value and experimental value of shaly sandstone under different confining pressures calculated by modified D-P yield function are compared with the experimental values, and the error between them is controlled within 10%. The D-P yield criterion of shaly sandstone considering dry-wet cycle is feasible in practical application and provides a theoretical basis for obtaining the failure strength of rock under arbitrary confining pressure in engineering.
【作者单位】：重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;重庆工商大学管理学院;重庆大学建设管理与房地产学院;重庆市巴南区建设工程质量监督站;
【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)~~
【分类号】：TV223

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