纤维水泥土力学性能的试验研究

为了解加入纤维对水泥土力学性能的影响，对素水泥土及纤维水泥土进行了无侧限抗压和疲劳试验。研究结果表明，添加纤维可小幅度提高水泥土的抗压强度；与素水泥土相比，纤维水泥土在达到应力峰值时的应变明显增大，破坏后的残余强度也有所提高；纤维的加入提高了水泥土的延性，减少了裂缝的开展，改善了其力学性能；添加纤维后水泥土抵抗疲劳的能力明显增强；掺入纤维对水泥土抗疲劳能力的提高程度远大于其对水泥土无侧限强度的提高程度；水泥土的应力水平和疲劳寿命之间具有单对数线性关系；在循环荷载作用下水泥土表现为低应力性破裂特征。

Experimental study of mechanical properties of fiber cement soil

In order to understand the influence of fiber on the mechanical properties of cement soil, the unconfined compression test and fatigue test of cement soil and fiber reinforced cement soil are carried out. The results show that the compressive strength of cement soil can be improved slightly by adding fiber. Compared with plain cement soil, the strain of fiber cement soil increases obviously at the stress peak point; and its residual strength after failure also increases. The addition of fiber improves the ductility of the cement soil, reduces the crack development and improves its mechanical properties. After the fiber is added, the antifatigue ability of cement soil is significantly increased. The degree of the improvement of cement soil fatigue resistance is much greater than that of unconfined strength of cement soil. The relationship between stress level and fatigue life of cement soil is single logarithm linear. The cement soil is characterized by low stress rupture under cyclic loading.