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本文通过对不同深度分布的卵石土进行原位剪切试验,研究表明:随着深度增加,土体的孔隙减小,密实度增加,卵石土发生屈服破坏时,剪切位移逐渐减小,卵石土更易发生塑性变形破坏;泥质微胶结卵石土剪切破坏后,其残余抗剪强度没有明显衰减,应力应变曲线属于应变硬化型;试验场地中,卵石土中卵、砾石含量在60%~80%之间,以卵砾石含量70%为界限,卵石土的抗剪强度主要受到粗粒土控制,细粒土产生的黏聚力占次要作用;由于卵石土颗粒大小相差悬殊,在剪切过程中颗粒之间的咬合力随土体密实度对表观黏聚力影响较大,卵石土的颗粒级配情况对剪切面力学性质起控制作用。
In this paper, in-situ shear tests were conducted on pebble soils with different depths. The results show that with the increase of depth, the porosity of soil decreases and the density increases, and the shear displacement of pebble soils decreases gradually. The soil is more prone to plastic deformation and damage; the residual shear strength of the clay micro-cemented gravel soil has no obvious attenuation after shear failure, and the stress-strain curve belongs to the strain hardening type; in the test site, the content of eggs and gravel in pebble soil is between 60% 80%, with the gravel content of 70% as the limit, the shear strength of pebble soil is mainly controlled by coarse-grained soil, cohesion of fine-grained soil plays a minor role; pebble soil due to large differences in particle size, shear In the process of cutting, the bite force between the particles affects the apparent cohesion greatly with the soil compactness. The particle grading of the pebble soil plays a role in controlling the mechanical properties of the shear plane.