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为了对比1975—1976年在青藏高原风火山地区用中子水分仪测定的水分资料及其变化,1984年夏用兰州大学现代物理系研制的 ZG-1型中子水分仪,在凤火山铁路试验路堤、路堑以及铁道科学院西北研究所气象站天然钻孔,再次进行冻土水分测量,研究了天然上限和人为上限的变化,获得数据200多点次。试验表明:8—9年的反复冻融,并未引起天然上限变化(1.45m);铁路试验路堤的上限上升0.7—1.0m,说明风火山高寒气候有利于冻土形成和发育;铁路试验路堤经过8—9年之后,是趋于稳定的。
In order to compare the water data measured by neutron moisture meter from 1975 to 1976 in Fenghuoshan area of Qinghai-Tibet Plateau and its change, the ZG-1 neutron moisture meter developed by Lanzhou University’s Department of Modern Physics in the summer of 1984 was used in Feng-volcano Railway Test Embankment, cutting and Northwest Institute of Railway Academy of Meteorological Station natural drilling, once again permafrost moisture measurement, study of the natural upper limit and the artificial upper limit changes, access to more than 200 data points. Experiments show that the freezing and thawing cycles of 8-9 years did not cause the change of natural upper limit (1.45m); the upper limit of the railway embankment increased 0.7-1.0m, indicating that the alpine climate of Fenghuoshan is favorable for the formation and development of frozen soil; After 8-9 years, it is stable.