【摘要】 对两种典型的上海饱和冻结软土进行单轴无侧限抗压强度试验,在温度为-20,-10,-5℃和加载速率为1×10-3,3×10-4,5×10-5s-1的条件下,共进行了2组18个土样的试验.通过对试验数据的分析,得出饱和冻结软土的单轴抗压强度受温度、应变速率、含水量及干密度等因素的影响规律:(1)抗压强度随应变速率的增加以幂函数的形式增大;(2)抗压强度随温度的降低线性增大;(3)在相同的应变速率及温度条件下,含水量越大,冻结软土的抗压强度越大,干密度越大,抗压强度越小,得出抗压强度与温度、应变速率关系的幂函数模型参数;(4)弹性模量随加载速率对数的增加呈幂函数形式增加,随温度的升高线性降低.更多还原

【Abstract】 Uniaxial compressive strength tests of 18 samples are conducted on 2 typical saturated frozen soft soils in Shanghai under various constant strain rates(1×10-3,3×10-4,5×10-5 s-1) and temperatures(-20,-10,-5 ℃).From the test results,several rules are obtained.(1) Compressive strength increases exponentially as strain rates increase.(2) Compressive strength increases linearly as temperature decreases.(3) Compressive strength of the saturated frozen soils with higher water content is higher than that of frozen soils with lower water content and compressive strength with higher dry density is lower than that with lower dry density.Parameters of exponential function concerning compressive,temperature and strain rate are derived.(4) Elastic modulus increases exponentially as logarithmic strain rates increase and decreases linearly as temperature increases.更多还原