地质条件对盾构隧道环片的影响

Effects of geological conditions on the lining segment of shield tunnel

为了研究油气管道盾构隧道工程中地质条件、覆土深度、衬砌环片厚度及混凝土强度等因素在不同工程环境下的相互影响及变化规律,采用有限元分析软件对盾构隧道衬砌环片的结构受力进行数值模拟分析。结果表明:地层性质对于衬砌环片的轴向力影响不明显,但对于弯矩与剪力的影响则相对明显;盾构隧道覆土深度对于衬砌环片的轴力影响很大,但对于弯矩与剪力影响较小;盾构隧道开挖衬砌环片变位及环向应力均与衬砌环片厚度比呈类似双曲线关系。地质条件对盾构隧道环片的影响存在一定规律,其可为盾构隧道环片的设计提供指导。

In order to research the change laws and interaction of geological conditions, covering soil depth, lining segment thickness and concrete strength of pipeline shield tunnel engineering in different engineering environments, the finite element analysis software was used to perform numerical analysis and simulation on the structural force applied on the lining segment of shield tunnel. It is shown that the strength of the formation properties has less effect on the axial force of lining segment, but more on the bending moment and shear force. The covering soil depth of shield tunnel has great influence on the axial force of lining segment, but less on the bending moment and shear force. It is in the similar hyperbolic relationships between the thickness ratio of lining segment and the deflection and circumferential stress of lining segment at the moment of shield tunnel excavation. To sum up, the effects of geological conditions on the lining segment of shield tunnel follow a certain rule and mastering the rule can guide the design of the lining segment of shield tttrmel.