【摘要】 选择三峡库区典型紫色土坡耕地埂坎为研究对象,通过室内三轴不固结不排水试验（UU）研究加筋对埂坎土壤抗剪特征的影响。结果表明:（1） 3种试验材料加筋土均表现出土壤黏聚力随着加筋量的增加先增大后减小,埂坎土壤黏聚力大小表现为:c_麦壳>c_竹丝>c_稻秆>c_素土。埂坎土壤黏聚力最大时,麦壳、竹丝和稻秆的加筋量分别为0.8%,0.5%和0.3%。加筋材料对土壤内摩擦角的影响不明显。（2） 3种加筋材料均能提升土壤抗剪强度。土壤极限主应力差随着加筋量的增加先增大后减小,麦壳、竹丝和稻秆加筋土的极限主应力最大值均出现在最优加筋量处。4种试验围压下,加筋埂坎土极限主应力差最大值均体现出（σ₁-σ₃）_麦壳>（σ₁-σ₃）_竹丝>（σ₁-σ₃）_稻秆>（σ₁-σ₃）_素土。（3）最优加筋量条件下,3种加筋埂坎土壤试样在不同试验围压下的应力—应变曲线均呈硬化型。更多还原

【Abstract】 The typical fieldriges on the purple soil sloping farmlands in the Three Gorges Reservoir area were chosen to study the effects of reinforcement materials on soil shearing strength of fieldriges by laboratory unconsolidated undrained triaxial compression tests. The test results indicateds that:（1） The three tested materials showed that soil cohesion increased first and then decreased with the increasing of reinforcement amount. The cohesion of the fieldriges with different reinforced materials followed the order of c_{wheat husks}>c_{bamboo wool}>c_{rice straw}>c_{unreinforced soil}. When the cohesion of fieldriges soil was the largest, the reinforcement amount of wheat husks, bamboo wool and rice straw were 0.8%, 0.5% and 0.3%, respectively. But the effect of reinforcement materials on soil internal angle was not obvious.（2） Compared with unreinforced soil, the shearing strength of fieldriges soil with reinforcement materials all increased. As the reinforcement amount increased, the limit principal stress difference increased and then decreased, and the maximum of the limit principal stress difference all appeared at the optimal reinforcement amount of wheat husks, bamboo wool and rice straw respectively. Under the four kinds of confining pressures, the maximum value of the limit principal stress difference of reinforced fieldriges soil all showed that（σ₁-σ₃） _{wheat husks}>（σ₁-σ₃）_{bamboo wool}>（σ₁-σ₃）_{rice straw}>（σ₁-σ₃）_{unreinforced soil}.（3） Under the optimal reinforcement amount, the deviatoric stress-strain curves of three reinforced fieldriges soil samples all displayed a hardening type.更多还原