摘要
多年冻土区斜坡段路基由于受到环境、冻土条件、地貌特点及工程条件的影响,其稳定性对线路的安全运营存在潜在的危害,本文通过现场实地调研,选取典型斜坡路基断面并进行现场取样,针对试验段典型土样,开展了室内静三轴及振动三轴压缩试验研究。试验结果表明,冻土强度随温度的降低而线性增大,随含水量的增大而降低,而围压变化(0.5～2MPa)对冻土强度的影响很小;冻土的动弹性模量随温度的降低而增大,含水量在塑限范围内动弹性模量随含水量的增大而增大,当含水量超过塑限时,动弹性模量随含水量变化不大,而围压变化(0.5～2MPa)对动弹性模量的影响较小。
The complicated geological conditions and environment temperature in permafrost regions,in particular,the permafrost and seasonal frozen soil are the key issues to the engineering construction and the stability.The strength and the dynamic elastic modulus of the frozen soil of the slope section in permafrost regions of Qinghai-Tibet Railway are studied,and the field soil samples are mainly consisted of silty clay and gravel.The results of the experimental study on the silty clay show that the strength of the frozen soil increases linearly with the decreasing of the temperature,the strength decreases with the increasing water content,and with the water content increasing,the decreased intensity of the strength gradually reduces.Under the conditions of the confining pressures（0.5~2MPa）,the strength changes in a small range.The dynamic elastic modulus of the frozen soil increases with the decreasing temperature,and the temperature is more important as the influencing factor than the confining pressure.Under the higher water content conditions,the dynamic elastic modulus changes in a small range with the increasing of water content.However,the dynamic elastic modulus increases with increasing water content under the lower water content conditions.
出处
《工程勘察》
CSCD
北大核心
2011年第12期1-5,16,共6页
Geotechnical Investigation & Surveying
基金
国家科技支撑计划(2006BAC07B02)
国家自然科学基金青年基金(41001036)
关键词
青藏高原
多年冻土
斜坡
冻土强度
动弹性模量
Qinghai-Tibet plateau
permafrost
slope
strength of frozen soil
dynamic elastic modulus
