干湿与盐渍耦合作用下土遗址强度劣化机理  

Mechanism and processes of intensity deterioration of earthen ruin's soil undergoing salinized and dry-wet coupling effect

作　　者：崔凯[1,2] 陈蒙蒙[1] 谌文武[2] 关喜鹏 韩文峰[2] Cui Kai Chen Meng-meng Chen Wen-wu Guan Xi-peng Han Wen-feng(Western Center for Disaster Mitigation in Civil Engineering of Ministry of Education of China, Key Labo- ratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China Key Laboratory of Mechanics on Disaster and Environment in Western China with the Ministry of Educa- tion, Lanzhou University, Lanzhou 730000, China)

机构地区：[1]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730050 [2]兰州大学西部灾害与环境力学教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2017年第5期582-587,592,共7页Journal of Lanzhou University(Natural Sciences)

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

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.It was found that there are differences in frequencies and degrees of coupling effects for soil located in the inner earthen sites of different places, according to real time monitoring of the temperature and moisture content for three typical sites during concentrated rainfall processes. The remolded soil with different contents of NaCl and Na_2 SO_4 that had experienced different periods of wet-dry cycles was used to measure strength indexes and analyze particle sizes. Regular and regulatory experiment results were obtained, showing that the compression strength, tensile strength, cohesion values, coarse grain and silt contents and granularity fractal dimension value of samples all increased with the higher salinity and more times of wet-dry cycles. Mathematical statistical analysis showed that a quantitative relation exists between macroscopic intensity and grain size analysis indexes under different frequencies and degrees of coupling effects. The essential reasons for soil strength degradation under the wet-dry and saline coupling effect were analyzed and discussed, and a relationship was found to exist between those sites＇ forms of dying processes and the speed and soil strength degradation.

关 键 词：遗址土 耦合作用 强度响应 粒度分维 监测 

分 类 号：TU411.2[建筑科学—岩土工程]