论文部分内容阅读
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。
Lightweight foam is a kind of light earth with excellent properties, which can effectively improve the stability of roadbed and reduce the subsidence of roadbed. The strength of the material under the cyclic load of the road is lower than the static strength, and the static strength is taken as the design parameter to be dangerous. The mechanical properties of foam-mixed lightweight soil under cyclic loading were studied through laboratory tests. It is found that the stress-strain relationship of foam-mixed lightweight soil under cyclic loading is stable and destructive. The critical loading ratio is 0.75, that is, The strength under cyclic loading should be taken as 0.75 times of the unconfined compressive strength. The failure strain is larger than that of one load, and decreases with the increase of loading ratio. The slope of springback curve and recompression curve are similar, The increase in the number of basic unchanged.