摘要
分析了新老路基各试验断面软土层的物理力学特性,开展了新老路基软土室内三轴剪切试验和直剪试验,并进行了试验对比分析。结果表明:老路基经过多年的运营产生了固结变形,其固结程度与力学性质好于新路基,表现在老路基软土的抗剪强度稍高于新路基对应位置,粘聚力高于新路基,但内摩擦角则相对低于新路基;由直剪试验求得的软土粘聚力普遍小于由三轴剪切试验求得的软土粘聚力,内摩擦角则相对较大;建议在考虑新路基的软基段的处理方法时,采取比相应段原有老路基的处理方式更为刚性的处治对策,更加严格地控制新路基沉降和差异沉降。
The physical and mechanical characteristics of the new and the old foundation soft soil were completed to make the expressway widening deformation uniformly. Tri-axial shear test and direct shear test in the laboratory were carried out and their comparison tests were analyzed. The results show that the old foundation＇s consolidation degree and mechanical properties are better than new foundation＇s because of deformation after many years of consolidation. The cohesion of the old foundation is larger than the new one＇s, but the angle of internal friction is smaller than new foundation＇s. In general, the old foundation＇s shear strength is larger than the new foundation＇s shear strength. The shear strength obtained from direct shear test is smaller than that obtained from tri-axis test. It is instructed that when dealing with the soft part of the new foundation, some tough measures of controlling the settlement should be adopted to make the deformation uniformly. 4 tabs, 10 figs, 19 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第3期37-42,共6页
Journal of Chang’an University(Natural Science Edition)
基金
中国科学院岩土力学重点实验室开放课题(Z000602)
湖北省环境岩土工程重点实验室开放课题(T000508)
关键词
道路工程
高速公路
拓宽
软土路基
road engineering
expressway
widening
soft clay foundation
