论文部分内容阅读
现有反滤设计中保土准则使用土工织物未受拉时的等效孔径,但平面单向拉伸会导致该值变化,变大则不满足保土准则,变小则不满足透水准则及淤堵准则。有纺织物孔径由孔径分布曲线和特征孔径反映,采用数字图像分析法对两种有纺土工织物单向受拉时孔径变化进行精确测定。有纺织物被单向张拉至3%,6%,9%和12%的平面应变,随着拉应变的增加,两种有纺土工织物开孔面积率增大;孔径分布曲线向孔径大的方向移动;3种特征孔径值(O30,O50和O95)增大,其变化率都与拉应变呈近似线性关系,且小孔径部分相对于大孔径部分随拉伸应变的增长而增大较快。
In the existing design of soil filtration, the equivalent pore size of geotextile without tension is used, but the flat uniaxial tension will lead to the change of this value. If it becomes larger, it will not satisfy the soil conservation criterion, if it is smaller, it will not satisfy the permeability criterion Stasis blocking guidelines. Apertures of woven fabrics are reflected by the pore size distribution curve and the characteristic aperture. The changes of the pore diameters of the two kinds of spun geotextile unilaterally are determined by digital image analysis. The woven fabric was unilaterally stretched to 3%, 6%, 9% and 12% of the plane strain. With the increase of tensile strain, the open area ratio of the two kinds of woven geotextile increased. (O30, O50 and O95). The rate of change is nearly linear with the tensile strain, and the ratio of the small-aperture portion to the large-aperture portion increases rapidly with the increase of tensile strain .