原位固化法(Cured-in-place pipe, CIPP) 作为一种非开挖、环保、高效的修复技术,已被广泛应用于管道修复。建立了环裂压力管道内衬在弯矩作用下力学响应三维有限元计算模型,并利用已有文献结果对所建立的模型进行了验证。分析了内压、弯矩、内衬管外径、内衬管厚度以及内衬管与既有管道之间的摩擦系数等参数对内衬管应力的影响。结果表明:当内压超过0.6 MPa时,内衬管最大应力集中于环断面顶部,其径向位移仅为既有管道最大位移的0.24%~0.97%,内压提升可有效抑制内衬管与既有管道的相对变形;内衬管中产生应力的管段长度随弯矩、外径和厚度呈线性增长,但受内压与摩擦系数抑制,摩擦系数由0.1增至0.6时,内衬管中产生应力的管段长度缩短约30%,为设计中的参数权衡提供了量化依据;在圆周位置θ = 90°处,内衬管内表面应力超越外表面,且差值随θ增大而显著。
Cured-in-place pipe (CIPP) has been widely used in pipeline rehabilitation as a trenchless, environmentally friendly and efficient repair technology. A three-dimensional computational model of the mechanical response of ring-fractured pressure pipe lining under bending moment is established by the finite element method, and the established model is verified by using the results of existing literature. The effects of parameters such as internal pressure, bending moment, outer diameter of the liner, liner thickness and friction coefficient between the liner and the host pipe on the stress of the liner are analyzed. The results show that: When the internal pressure exceeds 0.6 MPa, the maximum stress of the liner pipe is concentrated at the top of the ring section, and its radial displacement is only 0.24%~0.97% of the maximum displacement of the host pipe, indicating that the increase in internal pressure can effectively suppress the relative deformation of the liner and the host pipe. The length of the pipe section that generates stress in the liner increases linearly with the bending moment, outer diameter and thickness, but is suppressed by the internal pressure and friction coefficient. For example, when the friction coefficient increases from 0.1 to 0.6, the length of the pipe section that generates stress in the liner is shortened by about 30%, which provides a quantitative basis for the parameter trade-off in the design. At the circumferential position θ=90°, the stress on the inner surface of the liner exceeds that on the outer surface, and the difference becomes significant as θ increases.
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