摘要
依托宁波地区甬舟铁路金塘海底隧道工程,针对隧道洞身范围的粉土和粉质黏土,在不同温度和不同含水率条件下进行冻土抗折强度试验,研究人工冻土抗折强度随温度和含水率变化的规律特征。结果表明:粉土和粉质黏土冻土抗折强度均随冻结温度的降低而增大,冻土抗折强度受冻结温度影响明显;不同含水率对粉土和粉质黏土抗折强度有一定影响,粉土试样在含水率为30%时,其抗折强度最大,粉质黏土试样在含水率为34%时,其抗折强度最大;当土层的含水率超过饱和最优含水率时,冻结土的抗折强度减小。试验结果可为金塘海底隧道冻结法设计和施工提供科学指导。
Based on the Jintang undersea tunnel project in Ningbo area, to study the laws and characteristics of the flexural strength of artificial frozen soil, the flexural strength tests of silty soil and silty clay in the tunnel were carried out under different temperatures and water content. The results show that the flexure strength of silty soil and silty clay increases with the decrease of freezing temperature, and the flexure strength of frozen soil is obviously affected by freezing temperature. Different water content has a certain effect on the flexural strength of silt and silty clay. The flexural strength of silty soil samples reaches maximum when the water content is 30%. When the water content is 34%, the flexural strength of silty clay is the highest. When the soil moisture content exceeds the optimal saturated moisture content, the flexural strength of frozen soil decreases. The experimental results can provide scientific guidance for the design and construction of freezing method of Jintang submarine tunnel.
作者
刘华吉
Liu Huaji(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,Hubei,China)
出处
《岩土工程技术》
2022年第2期165-168,共4页
Geotechnical Engineering Technique
关键词
人工冻土
冻结温度
抗折强度
含水率
frozen soil
freezing temperature
flexural strength
water content
