新开挖膨胀土边坡大气影响深度的现场试验  

Field test on atmosphere influence depth on newly excavated expansive soil slope

作　　者：李雄威[1,2] 孔令伟[1] 陈建斌 郭爱国[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]常州工学院土木建筑工程学院,江苏常州213002 [3]武汉市政工程设计研究院有限责任公司,道桥设计院,湖北武汉430015

出　　处：《辽宁工程技术大学学报（自然科学版）》2010年第1期99-102,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金资助项目(10872210);交通部西部交通建设科技基金资助项目(200631878530);岩土力学与工程国家重点实验室基金资助项目(SKLZ0803)

摘　　要：为了获得大气对膨胀土边坡的动态影响过程,在南宁对新开挖膨胀土边坡进行了现场监测,从湿、热两方面对大气影响深度进行了分析。结果表明,含水量变化下的大气影响深度随季节性干湿循环而变大,但其变化滞后于温度;温度变化下的大气影响深度基本稳定,但"季节性影响深度"远大于"日影响深度";采取植被防护后,植被的蒸发、蒸腾作用,可减小温度、湿度的变动幅度,降低影响深度。可见,新开挖的膨胀土边坡需采取即时防护,植被护坡可有效降低大气对边坡土体的风化作用。To obtain the atmosphere dynamic influence process, a field monitoring system on the newly excavated expensive soil slope is established in Nanning, Guangxi. From the aspects of moisture and heat, the atmosphere influence depth is analyzed. The results show that the influence depth of water content increases with the seasonal cycle of drying-wetting progress; the change lags the heat changes; the seasonal influencing depth of heat is invariable; and the depth affected by seasonal cycle is much higher than daily influence depth. With the vegetation cover, the fluctuation of the moisture and heat field is mitigated because of its evaporation and transpiration behavior, which prevent the development of the atmosphere influence depth. It concludes that the newly excavated expansive soil slope must be protected immediately, and the weathering process can be effectively mitigated in the seeded slope.

关 键 词：膨胀土 堑坡 大气影响深度 植被 

分 类 号：U416.1[交通运输工程—道路与铁道工程]