【摘要】 为探究纵向盲管堵塞状态下隧道衬砌力学特性演化规律，提出一种纵向盲管堵塞模拟方法。通过改变堵塞物的横截面面积和纵向长度，实现纵向盲管堵塞状态改变。以浙江省岩溶区虎溪台隧道为依托，进行了室内模型试验与有限元软件ABAQUS数值模型计算，分析了不同纵向盲管堵塞状态下隧道衬砌力学特性。结果表明：（1）随着纵向盲管堵塞加重，衬砌背后水压力和二次衬砌最大、最小主应力都呈现非线性增长趋势。并且，随横截面堵塞加重，都出现了先平缓增长再快速增长的趋势；随纵向长度堵塞增长，都出现了先快速增长后平缓增长的趋势；（2）在横截面堵塞前期，衬砌背后水压力增长率区间为[0.21%,6.2%]，二次衬砌最大、最小主应力增长率区间为[1.3%,2.6%]、[2.6%,3.6%]；在横截面堵塞后期，增长率区间分别为[12.7%,13.0%]、[20.0%,21.3%]、[6.6%,7.1%];(3)在纵向长度堵塞前期，衬砌背后水压力增长率区间为[5.8%,19.5%]，二次衬砌最大、最小主应力增长率区间为[0.18%,20%]、[0.19%,9.4%]；在纵向长度堵塞后期，增长率区间分别为[0.35%,2.75%]、[0.9%,1.2%]、[0.46%,1.3%];(4)确定在纵向盲管堵塞前期，应重点对其纵向长度进行清理；在堵塞后期，应重点对其横截面进行清理的优先清理原则。更多还原

【Abstract】 To investigate the evolution patterns of the mechanical properties of tunnel lining under longitudinal blind pipe blockage conditions, a simulation method for longitudinal blind pipe blockage was proposed. Changes in the blockage conditions of longitudinal blind pipes were achieved by varying the cross-sectional area and longitudinal length of the blocking material. Based on the Huxitai Tunnel in the karst area of Zhejiang Province, indoor model tests and finite element numerical simulations using ABAQUS software were conducted to analyze the mechanical properties of tunnel lining under different longitudinal blind pipe blockage conditions. The results showed that:(1) as longitudinal blind pipe blockage intensified, the water pressure behind the lining and the maximum and minimum principal stresses of the secondary lining showed non-linear growth. Moreover, with increasing cross-sectional blockage, all variables first increased slowly and then rapidly. With increasing longitudinal blockage length, they first increased rapidly and then gradually stabilized.(2) In the early stage of cross-sectional blockage, the growth rate range of the water pressure behind the lining was [0.21%, 6.2%], while the growth rate ranges of the maximum and minimum principal stresses of the secondary lining were [1.3%, 2.6%] and [2.6%, 3.6%], respectively. In the later stage of cross-sectional blockage, the growth rate ranges were [12.7%, 13.0%], [20.0%, 21.3%], and [6.6%, 7.1%], respectively.(3) In the early stage of longitudinal length blockage, the growth rate range of the water pressure behind the lining was [5.8%, 19.5%], while the growth rate ranges of maximum and minimum principal stresses of the secondary lining were [0.18%, 20%] and [0.19%, 9.4%], respectively. In the later stage of longitudinal length blockage, the growth rate ranges were [0.35%, 2.75%], [0.9%, 1.2%], and [0.46%, 1.3%], respectively.(4) It was determined that the principle of priority cleaning in the early stage of longitudinal blind pipe blockage should focus on clearing its longitudinal length, while it should place emphasis on clearing its cross-section in the later stage of blockage.更多还原