为了解决由煤层采动和重载车辆导致的路基砂土大变形问题,依据三轴压缩试验,研究了4种纤维长度和4种纤维掺量下砂土的强度和抗变形能力。结果表明:纤维土的应力-应变关系近似呈双曲线关系,主要破坏形式为鼓胀破坏;纤维土的力学性能随纤维掺量和长度的增加而增大,但对内摩擦角影响很小。最后在试验基础上通过1stOpt进行多因素回归分析得到黏聚力与纤维长度和掺量的拟合公式,并通过与实测值比较,认为其能够满足工程需要。

In order to solve the problem of excessive deformation of sandy soil at road foundation caused by mining and automobile with heavy duty, we study the strength and deformation resistance of sandy soil under four different fiber lengths and blending amounts through triaxial compression test.Results show that the stress-strain relation of fiber-reinforced soil is approximately a hyperbolic function, in which the main failure form is swollen failure. With the increase of blending proportion and length of fibre, the mechanical properties of fibre-reinforced soil strengthen, but the angle of internal friction is barely affected. Finally, a fitting formula of cohesion vs. fiber length and mixing amount is obtained by multivariate regression analysis based on the 1stOpt experiment and the results meet the requirement of actual projects by comparison with measured data.