Safety and resilience analysis of tunnel structures considering the dual effects of primary support concrete dissolution and crystallization in drainage system
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摘要: 为探明初支混凝土溶蚀与排水系统结晶双重效应对隧道结构安全的影响,开展了碳酸侵蚀环境下水泥基材料的溶蚀试验,推导了双重效应作用下隧道结构受力的理论分析方法,以工程案例计算双重效应对隧道结构安全与韧性的影响规律。结果表明:(1)碳酸侵蚀环境中水泥基材料的强度表现出在一定的区间内波动式衰减的规律,拟合得到了双指数型强度衰减系数公式;(2)双重效应引发的隧道二衬结构应力增量与初支混凝土溶蚀衰减系数β呈反比,与溶蚀沉积转换系数δ呈正比,增量的主导地位主要受δ控制;(3)经预测,工程案例隧道运营10年后,其结构安全系数和韧性指标将分别下降17.3%和15.3%,趋近安全极限。因此,初支混凝土溶蚀和排水系统结晶双重效应对隧道结构的长期影响不可忽视,应在设计阶段予以充分考虑,并加强养护期的工程措施。Abstract: To elucidate the impact of the dual effects of primary support concrete dissolution and crystallization in drainage system on the safety of tunnel structures, a series of dissolution tests on cement-based materials under carbonation conditions were conducted. A theoretical analysis method for the stresses on tunnel structures under the dual effects was derived, and the impact of these effects on the safety and resilience was calculated in a case study. The results indicate the following: (1) Under carbonation environments, the strength of cement-based materials exhibits an oscillatory attenuation pattern within a specific range. A dual-exponential formula was fitted to characterize the strength degradation coefficient. (2) The stress increment in the tunnel lining caused by the dual effects is inversely proportional to the decay coefficient β of the primary support concrete and directly proportional to the dissolution-deposition conversion coefficient δ. The dominance of the stress increment primarily are controlled by δ. (3) Analysis predicts declines of 17.3% in the structural safety factor and 15.3% in the resilience index after 10 years of tunnel operation, which is approaching safe limits. Therefore, the long-term impact of the dual effects of primary support concrete dissolution and crystallization in drainage system on tunnel structures cannot be overlooked. These effects should be given full consideration during the design and construction phases, and engineering measures during the maintenance phase should be strengthened.
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表 1 水泥砂浆物理力学性能指标
Table 1. Physical and mechanical properties of cement mortar
项目 比表面积/(m2·kg−1) 标准稠度/% 凝结时间/min 抗压强度/MPa 初凝 终凝 测值 346 25.5 157 201 38.38 表 2 理论分析的参数
Table 2. Parameters for theoretical analysis
序号 参数 取值 单位 备注 1 r0 5 m 2 r1 5.3 m 3 r2 5.5 m 围岩内径 4 r3 25 m 5倍洞径 5 P3 2.7 MPa 100 m埋深 6 H 50 m 50 m地下水头 7 γ 10 kN·m−3 8 V 0.019 m3 ϕ110 mm纵向排水管 9 m2 1.493×104 kg 10 ρS 2.93 kg·m−3 11 E1 28 GPa 二衬弹性模量 12 E2 28 GPa 初支弹性模量 13 E3 35 GPa 围岩弹性模量 14 μ1 0.2 二衬泊松比 15 μ2 0.2 初支泊松比 16 μ3 0.3 围岩泊松比 表 3 计算参数
Table 3. Parameters for model calculation
参数 重度γ/(kN·m−3) 弹性模量E/GPa 泊松比μ 内摩擦角φ/(°) 弹性抗力系数K/(MPa·m−1) V级围岩 19.5 16 0.38 45 150 二次衬砌 23 30 0.2 -
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