CAJ | 학술논문

为了研究深上限-退化型多年冻土路基变形特点，基于青藏公路多年冻土路基地温和沉降现场监测资料，通过分析西大滩、唐古拉山北坡以及唐古拉山南坡路段的土质、冻土含冰量、冻土地温以及路基沉降变形数据，对冻土上限变化过程与路基沉降特点进行了研究，同时对沱沱河和清水河地区冻土路基分层沉降观测结果进行了分析。结果表明，土质和含冰量对退化型冻土路基的沉降变形影响较大，深冻土层的融化对路基沉降变形影响较小，退化型冻土路基的沉降变形主要发生在退化后的冻土层中，退化冻土层在冻融循环过程中，需要较长时间才能完成固结。对于冻土含冰量为少冰、多冰的稳定路段，退化冻土路基年平均沉降速度约为3.9～5.6 mm/a，路基沉降量极小；对于含冰量较高且土质以粉黏性颗粒为主的不稳定路段，路基沉降速度具有持续性和无减缓性的特点，路基年平均沉降量达到0.03 m/a，路基变形表现为整体均匀沉降，横向差异沉降量较小。
위료연구심상한-퇴화형다년동토로기변형특점，기우청장공로다년동토로기지온화침강현장감측자료，통과분석서대탄、당고랍산북파이급당고랍산남파로단적토질、동토함빙량、동토지온이급로기침강변형수거，대동토상한변화과정여로기침강특점진행료연구，동시대타타하화청수하지구동토로기분층침강관측결과진행료분석。결과표명，토질화함빙량대퇴화형동토로기적침강변형영향교대，심동토층적융화대로기침강변형영향교소，퇴화형동토로기적침강변형주요발생재퇴화후적동토층중，퇴화동토층재동융순배과정중，수요교장시간재능완성고결。대우동토함빙량위소빙、다빙적은정로단，퇴화동토로기년평균침강속도약위3.9～5.6 mm/a，로기침강량겁소；대우함빙량교고차토질이분점성과립위주적불은정로단，로기침강속도구유지속성화무감완성적특점，로기년평균침강량체도0.03 m/a，로기변형표현위정체균균침강，횡향차이침강량교소。
In order to study the deformation characteristics of embankment with deep permafrost table and degenerative permafrost, based on the permafrost temperature and settlement monitoring data of Qinghai-Tibet Highway, the change process of permafrost table and embankment settlement characteristics were analyzed by analyzing the soil of permafrost, ice content of permafrost, permafrost temperature and embankment settlement deformation data in Xidatan, Tanggula North Slope and Tanggula South Slope. The layered settlement test data monitored from permafrost embankment in Tuotuohe and Qingshuihe area were also analyzed. The results show that the soil and ice content of permafrost have great effect on the degenerative permafrost embankment settlement;while deep permafrost melting has less effect on the embankment settlement. The settlement comes form degenerative permafrost layer and the consolidation of degenerative permafrost layer take a long time to complete in freezing and thawing cycle. In stable road section with permafrost of ice-poor and icy frozen soil, the degenerative embankment settlement rate is 3.9-5.6 mm/a approximately;and the degree of embankment settlement is very small. The embankment settlement has characteristics of persistence and no-slowing with soil of high ice content and powder clay;permafrost embankment deformation shows uniform settlement with less transverse differential settlement.