摘要
为了给宁波轨道交通人工冻结提供设计、施工参数,对宁波海相沉积人工软土开展了冻胀融沉、抗剪强度和单轴抗压强度试验研究,获得了江厦桥东—天一广场区间人工冻结工程主要地层在开放条件和封闭条件下的冻胀率和融沉率以及冻土的抗剪强度指标及极限抗压强度值。结果表明:开放条件下各土层的冻胀融沉较封闭条件下大,且随含水量的增加而增大;冻结后各土层内摩擦角和粘聚力有了明显的增大,冻土的单轴抗压强度、弹性模量随温度降低呈线性增大。
In order to provide the design and construction parameters for Ningbo rail transit engineering,the tests of the frost heave and thaw strain,shearing strength and uniaxial compressive strength are carried out.The frost heaving ratio and the thaw coefficient under the opening condition and sealed condition,the shear strength and the ultimate compressive strength values in the section between the Jiangxia Bridge east and Tianyi square are obtained.The testing results show that the frost heaving ratio and the thaw coefficient under opening condition are greater than those in the sealed condition,and the values increase with the increasing of water content.The internal friction angle and the cohesion of the frozen soil are improved with respect to the undisturbed soil.In addition,the elastic modulus and the Poisson ratio in different temperature for the frozen soil linearly increase with the decrease of temperature.
出处
《工程勘察》
CSCD
北大核心
2011年第8期19-23,共5页
Geotechnical Investigation & Surveying
基金
宁波市自然科学基金项目资助(2010A610081)
宁波市重大科研攻关项目资助(2009C50004)
关键词
轨道交通
软土
人工冻结
冻胀融沉
强度
rail transit
soft clay
artificial frozen
frost and thaw
strength
