地铁区间隧道空气温度与围岩土体蓄放热量随年限演化特性的迭代求解
Iterative solution for evolution characteristics of air temperature and heat storage and release in surrounding rock and soil in subway interval tunnels over time
摘要：
基于CHAMPS-BES软件,提出了一种耦合区间隧道热平衡模型与围岩土体温度场的迭代求解方案。该方案通过多次迭代求解,得到了区间隧道空气温度、围岩土体温度场及蓄放热量随年限演化特征。研究结果表明,随着迭代次数增加,隧道空气温度的精度逐步提高,体现了该方案的准确性。针对上海某典型车站区间隧道的研究发现:围岩土体温度、围岩壁面温度、隧道空气温度随运营年限增加呈现上升趋势;距区间隧道壁面不同距离围岩土体温度在运营初期、中期和远期最高分别可达33.11、34.16、36.03 ℃,最低分别为12.67、15.33、17.00 ℃,除远期最低温度的位置位于距离壁面50.0 m土体处,其余均位于距离壁面0.1 m土体处;围岩壁面温度在运营初期、中期和远期最高分别可达33.27、34.28、36.24 ℃,最低分别为12.63、15.06、18.87 ℃;区间隧道空气温度在运营初期、中期和远期最高分别可达35.36、36.31、38.21 ℃,最低分别为11.86、14.01、18.17 ℃;围岩土体以蓄热为主,蓄热总量随年限不断增加,在每年的9月达到最大值425 922 MJ,在每年的2月最小。
Abstract：
Based on the CHAMPS-BES software, an iterative solution scheme coupling the interval tunnel heat balance model and the temperature field of surrounding rock and soil is proposed. Through multiple iterations, the evolution characteristics of the air temperature, the temperature field, and the heat storage and release in surrounding rock and soil in subway interval tunnels over time are obtained. The research results show that as the number of iterations increases, the accuracy of the tunnel air temperature gradually increases, which reflects the accuracy of this scheme. A study on a typical station interval tunnel in Shanghai finds that the temperature of surrounding rock and soil, wall temperature of surrounding rock, and tunnel air temperature show an increasing trend with the increase of operating years. The highest temperatures of surrounding rock and soil at different distances from the wall of the interval tunnel can reach 33.11, 34.16, and 36.03 ℃ during the early, middle, and long-term operational periods, and the lowest temperatures are 12.67, 15.33, and 17.00 ℃, respectively. Except for the long-term lowest temperature, which is located at a distance of 50 meters away from the wall, the rest are located at a distance of 0.1 meters away from the wall. The highest wall temperatures of surrounding rock can reach 33.27, 34.28, and 36.24 ℃ during the early, middle, and long-term operational periods, and the lowest temperatures are 12.63, 15.06, and 18.87 ℃, respectively. The highest air temperatures of interval tunnels can reach 35.36, 36.31, and 38.21 ℃ during the early, middle, and long-term operational periods, and the lowest temperatures are 11.86, 14.01, and 18.17 ℃, respectively. The surrounding rock and soil are mainly heat storage, and the total heat storage increases with the years, reaching a maximum of 425 922 MJ in September every year and a minimum in February every year.
Keywords:subway; interval tunnel; air temperature; surrounding rock and soil; heat storage and release; iterative solution; thermal environment