基于三轴试验的土工布加筋粗颗粒土变形及强度分析

Deformation and Strength Analysis of Geotextile Reinforced Coarse-Grained Soil Based on Triaxial Tests

对土工布加筋粗颗粒土做了常规三轴固结排水剪切试验,探讨了试样加筋层数(筋数n)对粗颗粒土变形强度特性的影响。结果表明,加筋后,土体由软化型转为硬化型;加筋可减弱土体剪胀性,限制其侧向变形;各围压下,强度加筋效果系数Rσ均大于1,n平均每增加1,Rσ增加0.075~0.345;加筋土在低围压下加筋效果更显著;筋材通过限制土体的侧向变形提高其强度;加筋土仍符合Mohr-Coulomb破坏准则,加筋后土体内摩擦角基本不变,而粘聚力得到显著提高。

The influences of geotextile reinforced layer number non the deformation and strength properties of coarsegrained soil were investigated by using the triaxial consolidation drained shear tests.The experimental results show that the soil is transformed from softening to hardening by reinforcement;The reinforcement could reduce dilatancy and inhibit lateral deformation.The coefficients of strength reinforcement effect Rσare all greater than 1 for different confining pressures;Rσincreases by 0.075~0.345 under different confining pressures,with the increment of nof 1.The reinforcement effect is more significant for low confining pressure.The geosynthetics increases the strength of soil through restraining its lateral deformation.The reinforced earth still accords with Mohr-Coulomb failure criterion;By reinforcement,the internal friction angle of the soil is almost unchanged while the cohesion significantly increases.