摘要
通过对常(德)—张(家界)高速公路软土路基中的土样进行大量的固结和直剪试验,探讨了在不同固结压力作用下,抗剪强度指标c,φ随固结度U的变化规律,研究了一次性加载与逐级稳定加载对抗剪强度指标随固结度变化规律的影响。结果表明,荷载1次施加时,内摩擦角φ随固结度U的增加而增加,粘聚力c在固结度U>30%时会随U的增加而有所增大,不同加载方式对抗剪强度指标c的影响较大而对φ的影响较小。给出了固结度与抗剪强度指标之间的拟合公式,其拟合结果对软土路基的安全填筑具有指导意义。
The consolidation tests and direct shear tests were performed to study the law of shear strength index of soft soil from the subgrade of Chang(de)-Zhang(jiajie) expressway, which change with its degree of consolidation under different consolidation load. The affection of loading method, namely, one time loading and the stepped loading on the law of shear strength was researched. It shows that the angle of internal friction φ increases with the degree of consolidation U, and the cohesion c will be increased only at the degree of consolidation from 30 to 100 percent; the loading method affect cohesion c obviously but less for the angle of internal friction φ. The relationships between degree consolidation and index of shear strength were recommended. The result can be referenced to the fill construction of embankment on soft soil.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2005年第2期51-55,共5页
Journal of Railway Science and Engineering
基金
铁道部科技发展项目(2003-G005)
