干湿与盐渍耦合作用下土遗址强度劣化机理

发布时间：2018-07-06 19:11

本文选题：遗址土 + 耦合作用　；参考：《兰州大学学报(自然科学版)》2017年05期

【摘要】：通过集中降雨过程3处典型遗址温度和含水率的实时监测,发现遗址内部不同位置土体经历耦合作用的频率与程度存在差异.通过对分别掺入不同含量Na_2SO_4、NaCl,经历不同期次干湿循环的遗址土重塑样的强度指标测试和粒度分析,得出试样的抗压强度、抗拉强度、内聚力、粗粉粒质量分数和粒度分维值都随含盐量和干湿循环次数的增加而产生规律性调整.数学统计分析证明不同频率与程度耦合作用下遗址土宏观强度指标的变化与粒度分析指标调整之间存在定量关系,分析和讨论了干湿盐渍耦合作用下遗址土强度劣化的本质原因、遗址消亡过程的形式和速度与遗址土强度劣化过程之间的联系.
[Abstract]:Through real-time monitoring of temperature and moisture content in three typical sites during concentrated rainfall, it is found that there are differences in frequency and degree of soil interaction between different sites. By testing the strength index and analyzing the particle size of the remolded sample of the site soil mixed with different contents of Na2SO4 and NaCl, the compressive strength, tensile strength and cohesion of the sample are obtained. The mass fraction and fractal dimension of coarse powder are adjusted regularly with the increase of salt content and the number of dry and wet cycles. The mathematical statistical analysis proves that there is a quantitative relationship between the change of macroscopic strength index and the adjustment of granularity analysis index under the coupling of different frequency and degree. This paper analyzes and discusses the essential cause of soil strength deterioration under the coupling of dry and wet salinization, and the relationship between the form and speed of site extinction process and the degradation process of site soil strength.
【作者单位】：兰州理工大学甘肃省土木工程防灾减灾重点实验室西部土木工程防灾减灾教育部工程研究中心;兰州大学西部灾害与环境力学教育部重点实验室;
【基金】：国家自然科学基金项目(52108245,41562015) 中央高校基本科研业务费专项资金项目(lzujbky-20124-5) 甘肃省高校基本科研业务费专项资金项目
【分类号】：TU41

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