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为了研究寒冷地区隧道二次衬砌混凝土结构在环境温度变化情况下的力学状态,基于振弦式混凝土应变计的测试原理,提出温差引起的误差修正公式,并采用数值模拟的方法,对隧道二次衬砌混凝土的温度应力进行了分析。结合陕西省吴堡至子洲段高速公路刘家坪3号隧道现场二次衬砌混凝土应变监测数据,研究了1年内环境温度变化情况下隧道二次衬砌混凝土的结构受力。结果表明:在温度的影响下,混凝土内部在冬季产生了比较大的拉应力,混凝土内侧拱顶产生压应力,其余部位内侧产生拉应力;混凝土外侧拱顶和边墙部位产生了比较大的拉应力,最大值出现在拱顶部位;混凝土的内外侧应力最大值为1.01 MPa,接近C25混凝土的设计抗拉强度1.33 MPa。
In order to study the mechanical state of the secondary lining concrete structure in cold area under the condition of ambient temperature, the error correction formula of temperature difference is put forward based on the testing principle of the vibrating wire concrete strain gauge. The numerical simulation method is used to analyze the secondary The temperature stress of lining concrete is analyzed. Combined with the monitoring data of secondary lining concrete at the No.3 tunnel of Liujiaping in Wubao-Zizhou Expressway in Shaanxi Province, the structural stress of the secondary lining concrete in tunnel under the change of ambient temperature within one year was studied. The results show that under the influence of temperature, the concrete has a relatively large tensile stress in winter and a compressive stress on the inner vault of concrete, and the tensile stresses on the inside of the other parts of the concrete. The maximum value of stress and peak appears in the dome. The maximum internal and external stress of concrete is 1.01 MPa, which is close to the designed tensile strength of C25 concrete of 1.33 MPa.