摘要
在多年冻土区,由于特殊的冻土工程地质条件带来的冻土问题,是铁路建设及维护面临的难题之一.为评价铁路沿线冻土工程地质条件,从分析影响冻土工程地质条件特征的两大因素冻土热稳定性和自然环境条件出发,结合现场勘探资料,采用突变级数法建立了可量化的冻土工程地质评价模型并划定评价等级,评价结果S分为5级:恶劣(S≤0.77)、较差(0.77<S≤0.86)、一般(0.86<S≤0.93)、较好(0.93<S≤0.96)、良好(S≥0.96).评价结果显示,柴木铁路沿线冻土热稳定性主要处于较差到一般状态;自然环境条件处于一般状态;在综合因素作用下,多年冻土工程地质条件一般.
The engineering problem caused by the special geological conditions in permafrost regions will be the main factor that affects the stability of the railway construction.In order to solve the problem,it is necessary to explore the engineering geological conditions along the railway and then give an evaluation that can be used as the guidance in engineering construction on permafrost regions.More than half of the recently built 142 km long Chai Mu Railway（CMR） in northern Qinghai Province,China travels across ice-rich permafrost in wetlands.Moreover,the permafrost is discontinuous and unstable with a mean annual ground temperature of-1 to 0 ℃.In order to evaluate engineering geological conditions along the CMR,catastrophe progression method was adopted to the evaluation.Based on analyzing the interaction between the thermal stability and nature environment,the engineering geological conditions along the railway can be divided into five states： severe（S≤0.77）,bad（0.77S≤0.86）,ordinary（0.86S≤0.93）,well（0.93S≤0.96） and perfect（S≥0.96）.The evaluation result shows that the thermal stability is in bad and ordinary states,and the nature environment is mainly in ordinary state.Under the interaction between thermal stability and nature environment,the permafrost engineering geological conditions are in ordinary state.
出处
《冰川冻土》
CSCD
北大核心
2011年第2期381-387,共7页
Journal of Glaciology and Geocryology
基金
国家自然科学基金创新群体项目(40821001)资助
关键词
柴木铁路
多年冻土
工程地质
突变级数法
Chai-Mu Railway
permafrost
engineering geology
catastrophe progression method
