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文章采用大比例(比尺1:20)物理相似模型试验,模拟了V、IV、III级围岩在30m埋深和不同净距(2～8m)隧道的开挖过程,研究了毛洞及不同加固支护状态下的地中位移、洞周位移增量、围岩压力随净距的变化规律,对比分析得到不同围岩级别下的小净距隧道的“合理”净距。研究结果表明:现行规范对小净距隧道净距的界定相对保守,且划分较单一。所谓小净距隧道的“合理”净距应综合考虑工法、支护参数、加固措施等多种因素,是在保证隧道开挖安全和经济等因素下的动态值。即是一个动态的范围值。
In this paper, a large scale (1:20 scale) physical similarity model test was used to simulate the excavation process of V, IV and III surrounding rock at depth of 30m and tunnels with different spacing (2 ~ 8m) Under the condition of different reinforcement and support, the displacements and displacements of the perimeter of the tunnel and the pressure variation of the surrounding rock vary with the clear distance, and the “reasonable” clearance of the small clear-distance tunnel with different surrounding rock levels is comparatively analyzed. The results show that the definition of the net spacing of small clear distance tunnels is relatively conservative and the division is relatively simple. The so-called small clear distance tunnel “reasonable ” clearance should be considered synthetically method, support parameters, reinforcement measures and other factors, is to ensure tunnel safety and economic factors such as dynamic value. That is a dynamic range of values.