纤维材料对流动化处理土力学特性影响的试验研究

Experimental study on the influence of fiber materials on the mechanical properties of fluidization treatment soil

为了使工程渣土成为可再次利用的新型建筑材料,首先探究了水泥固化材料对渣土的强度影响,然后将废旧报纸棉状化处理后制成再生纤维,将水、水泥和再生纤维混合在一起,通过流动化处理土工法得到新型改良固化土,利用三轴压缩试验探究再生纤维材料对固化渣土强度与变形特性的影响。结果表明:水泥主要通过改善固化土的黏聚力,提高初期杨氏模量和强度;纤维主要通过其增韧阻裂作用,提高土的内摩阻力,从而提高固化土的力学性能。最后,试验选用两段式拟合方程对不同掺量再生纤维固化土应力-应变曲线拟合,得到了较高的拟合度,较好地反映了其变形特性。

In order to reuse engineering residual soil and make it become a new type of building material, the influence of cement stabilizing material on the strength of residual soil was studied firstly, then the waste news- paper was cottonized to produce the regenerated fiber. A new improved solidified soil was obtained by mixing water,cement and regenerated fibers together by fluidization treatment method of soil. The influence of regener- ated fiber material on strength and deformation characteristics of solidified residue was investigated by triaxial compression test. The results showed that cement improved the initial elastic modulus and strength mainly by enhancing the cohesion with solidified soil. The mechanical properties of solidified soil were improved mainly by toughening and cracking resistance of fiber, and the increasing internal friction resistance of the soil. Final- ly, the stress-strain curve of regenerated fiber solidified soil with different content was fitted by two-stage fitting equation,and a higher fitting degree was obtained,which reflected the deformation characteristics of the soil.