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本文对由两种不同的膨胀土构成的石灰土进行了动变形与动强度的试验研究.利用动力三轴仪模拟列车荷载作用下铁路路基基床内的受力状态.试验结果表明,石灰膨胀土在动荷(列车荷载)作用下动应力——动应变关系能很好满足双曲线关系;石灰膨胀土的动弹模量与动强度均比原膨胀土的相应值大有提高;石灰膨胀土的动弹模量与动强度均随石灰掺入量(m)的增加而增大,而m值超过8%后、变化缓慢,故以m=8～11%适宜,以m=8%为最优方案;石灰膨胀土的最大动弹模量E_(dmax)与原膨胀土性质有关,且与侧压力σ_(3c)之间可用经验式表达.
In this paper, the dynamic deformation and dynamic strength of lime soil composed of two kinds of expansive soils are studied. The dynamic triaxial apparatus is used to simulate the stress state in the subgrade of railway subgrade under the train load. The experimental results show that the lime- The dynamic stress-strain relationship of soil under dynamic load (train load) can well satisfy the hyperbolic relationship; the dynamic modulus and dynamic strength of lime-swept soil are much higher than the corresponding values of the original swelling soil; lime-expansive soil (M) increases with the increase of lime content (m), while the value of m increases more than 8% and changes slowly, so m = 8 ~ 11% and m = 8% The optimal scheme is that the maximum dynamic modulus E_ (dmax) of lime-expansive soil is related to the nature of original expansive soil and can be expressed experientially with the lateral pressure σ_ (3c).