The mechanical properties of EPS beads mixed lightweight soil under cyclic loading
-
摘要: 泡沫塑料混合轻质土是一种性质优良的轻质土，能够有效提高路基稳定性，减小路基的沉降。材料在道路循环荷载下的强度低于静力强度，以静力强度作为设计参数偏于危险。通过室内试验研究了循环荷载下泡沫塑料混合轻质土的力学性质，发现在循环荷载下泡沫塑料混合轻质土的应力应变关系有稳定型和破坏型两种，临界加载比建议取0.75，即在循环荷载下的强度宜取为无侧限抗压强度的0.75倍；破坏应变大于一次加载的情况，且随加载比的增加而减小；回弹曲线和再压缩曲线斜率相近，而且随循环次数的增加基本不变。Abstract: EPS beads mixed lightweight soil is a lightweight soil with perfect mechnical properties. It can effectively improve the roadbed stability and reduce the settlement of roadbed. The strength under cyclic loading is less than that under static loading, so the static strength is dangerous to the design parameters for subgrade. Laboratory tests on the mechanical properties of EPS beads mixed lightweight soil under cyclic loading are conducted. The results show that there are two typical types of stress-strain relationships,which are failure type and stability type, and 0.75 is proposed as the critical load rate. Meanwhile the strength under cyclic loading is proposed as 75% of the unconfined compressive strength. The failure strain is greater than that in the case of loading only one time, while decreases with the load rate. The rebound curve and re-compression curve are of the same slope, which remain basically unchanged with the increase of cyclic times.
-
Keywords:
- lightweight soil /
- cyclic load /
- strength /
- critical load ratio
计量
- 文章访问数:
- HTML全文浏览量: 0
- PDF下载量:
下载:
