摘要
为促进人工冻结技术在城市地下工程中的推广应用,利用自制的冻胀融沉试验装置,对南京地区典型土质进行了融沉特性室内试验。结果表明:并非所有含水土体都产生融沉,只有当土体含水率超过起始融沉含水率后才会融沉。土体融沉系数随含水率增大而增大,且淤泥质黏土、粉质黏土融沉系数随含水率增大而分段线性增大。对于非饱和土,融沉系数与干密度变化规律中存在一个临界干密度,临界干密度对应土体最小的融沉系数。开敞型冻融时,融沉系数随温度升高而增大,封闭型冻融时,融沉系数随温度升高而减小。粉砂相对于淤泥质黏土和粉质黏土属于非冻胀融沉敏感土。
In order to promote the application of the artificial freezing technology in the underground engineerings of city, a set of testing devices were developed to do frozen swollen experiment and thaw settlement experiment of artificial permafrost. According to three kinds of soil in Nanjing region, thaw settlement experiments were done at the self- developed testing devices. The experiments results showed that the thaw settlement of soil occured only when the soll water content above the boundary water content. The thaw-settlement coefficient increased with the water content augment. Regarding to non-saturated soil,there existed a critical dry density between thaw-settlement coefficient and dry density changes. The critical dry density corresponded to the thaw-settlement coefficient in the smallest soll body. As there is the water source supply, thaw-settlement coefficient increases along with the temperature increment. When the water source doesnt supply ,thaw-settlement coefficient reduces along with the temperature increment. Mealy sand is not the frozen swollen sensitive soil if it was compared with silt clay and mealy clay.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第4期108-112,共5页
Journal of Nanjing Forestry University：Natural Sciences Edition
基金
江苏省"六大人才高峰"培养计划资助项目(2004)
关键词
人工冻土
融沉系数
含水率
干密度
冷端温度
Artificial freezing soil
Thaw settlement coefficient
Water content
Dry density
Freezing end temperature
