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通过大型模型试验对川西北地区砂卵石土抗剪强度指标摩擦角和咬合力的影响因素进行试验研究。结果表明:(1)砂卵石土的抗剪强度指标随着密实度的增大而增大。当增大到一定程度后,摩擦角和咬合力的增加速率变小,且有趋于稳定的趋势。(2)在密实状态和颗粒级配一定的情况下,由于砂卵石土自身的工程性质,含水量对其抗剪强度指标的影响甚微。(3)当粒径增大时,咬合力和摩擦角均在增大。所以在砂卵石土级配良好的情况下,可适度增大砂卵石土的粒径,以提高砂卵石土的抗剪强度。
Through the large-scale model test, the influence factors of shear strength index and bite force of sandy pebble soil in northwestern Sichuan were studied. The results show that: (1) The shear strength index of sandy pebble soil increases with the increase of the density. When increasing to a certain extent, the rate of increase of friction angle and occlusal force becomes smaller, and tends to be stable. (2) Due to the engineering properties of sand-gravel soil under certain conditions of dense state and particle grading, the influence of water content on its shear strength index is insignificant. (3) When the particle size increases, the bite force and friction angle are increasing. Therefore, in the case of sand gravel soil grading well, the particle size of sand pebble soil can be moderately increased to improve the shear strength of sand pebble soil.