摘要
回顾了青藏高原多年冻土区近年来所开展的路基工程地质研究工作 ,指出冻土工程地质勘探在方法上有很大进展 ,总结出了一整套冻土区工程地质勘察的暂行规定和细则。近年来的工作特别注重了对冻土地温和含冰量的研究 ,这是冻土工程地质中特有的十分重要的参数。在大量观测试验的基础上 ,总结出了有关路基稳定性的若干重要结论。据此提出 ,在气候转暖的背景下 ,高温冻土区筑路必须采用“冷却路基”的方法。为寻求气候转暖的对策 ,冻土工程地质预报的研究也取得了很大的进展 ,对冻土区路基工程地质的研究方向提出了新的建议。
In the permafrost regions of the Qinghai Xizang Plateau, many important engineering constructions,such as the gas pipeline from Golmud to Lhasa, fiber cable from Lanzhou to Xining and to Lhasa, Qinghai Xizang (Qing Zang) Highway (HWY 109), Xining Kangding (Qing Kang) Highway (HWY 214) and Xining Zhangye (Ning Zhang) Highway (HWY 227), have been completed. To summarize the engineering geological works of these constructions is of significance for guidance to the on going construction of Qinghai Xizang Railway, and to the future projects such as the construction of electric cable system and the diversion of river water from south to north in the western China. 1 Engineering geologic survey of permafrost The distribution of permafrost, especially the underground ice, is usually discontinuous in space. This phenomenon creates difficulties for geological investigation. Application of ground penetrating radar has greatly eased such difficulties and increased the accuracy of detection. A series of detailed regulations for engineering geological survey in permafrost regions of the Qinghai Xizang Plateau have been worked out based on practical investigations and theoretical researches over the past several decades. These regulations have been applied for guidance to the engineering geological works for Qinghai Xizang Railway construction in the permafrost region. Ground temperature and ice content are two main factors controlling the roadbed stability. They are also the unique indices for the engineering geological survey in permafrost regions. Many researches on these two factors have been conducted in the past several years. It has been found that 76% of the permafrost along the Qing Zang Highway is high temperature permafrost, and 59% belongs to high ice content permafrost. The thermo stability of roadbed in permafrost regions has been classified and evaluated based on the ground temperature and ice content. 2 Forecast of permafrost engineering and geological perspectives To forecast the chan
出处
《第四纪研究》
CAS
CSCD
北大核心
2003年第2期134-141,共8页
Quaternary Sciences
基金
中国科学院知识创新工程重大项目 (批准号 :KZCX1-SW - 0 4 )
