多年冻土区公路隧道融化圈计算方法

姚红志; 张晓旭; 董长松

doi:10.19818/j.cnki.1671-1637.2016.04.015

多年冻土区公路隧道融化圈计算方法

doi: 10.19818/j.cnki.1671-1637.2016.04.015

中交第一公路勘察设计研究院有限公司高寒高海拔地区道路工程安全与健康国家重点实验室, 陕西西安 710075

基金项目:

国家科技支撑计划项目 2014BAG05B05

详细信息

作者简介:
姚红志(1979-), 男, 湖南邵东人, 中交第一公路勘察设计研究院有限公司高级工程师, 从事地下工程研究

中图分类号: U451.2
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出版历程
- 收稿日期: 2016-05-21
- 刊出日期: 2016-08-25

Calculation method of thawing circle for highway tunnel in permafrost regions

State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China

More Information

Author Bio:
YAO Hong-zhi(1979-), male, senior engineer, +86-29-88322888, 120209040@qq.com

摘要

摘要: 为得到多年冻土区公路隧道围岩温度场和融化圈的发展规律, 建立了围岩融化圈的计算方法, 对融化圈深度和围岩温度的计算值与实测值进行了对比, 采用有限元法分析了支护对融化圈的影响。分析结果表明: 围岩温度平均误差不超过0.6℃, 融化圈深度误差不超过10%, 计算值与实测值吻合较好; 每延迟1 d施作喷射混凝土, 融化圈深度增大10cm, 喷射混凝土厚度每增加5 cm, 融化圈深度增加约10 cm; 一次模筑混凝土入模温度为15℃时的融化圈深度比入模温度为5℃时大了约10 cm; 当保温板厚度从5 cm增加到20 cm时, 融化圈深度减小2/3, 保温板及二次模筑混凝土水化热对融化圈深度有较大影响; 洞内风速为3.0 m·s^-1时的融化圈深度比洞内风速为1.0m·s^-1时减小了10~20 cm; 施作喷射混凝土30、60、90、120 d后, 洞内气温为8℃时的融化圈深度为洞内气温为2℃时的1.25、1.31、1.35、1.40倍。可见, 洞内气温宜控制在3℃⁵℃, 围岩开挖后应尽早施作支护, 宜选用低热或中热水泥以降低混凝土释放的水化热。
- 隧道工程 /
- 融化圈 /
- 有限元 /
- 多年冻土区 /
- 支护结构
Abstract: In order to obtain the temperature field of surrounding rock and the development law of thawing circle for highway tunnel in permafrost regions, the calculation method of thawing circle for surrounding rock was established, the calculated values and measured values of thawing circle depth and surrounding rock temperature were compared, and the finite element method was adopted to analyze the influence of support on the thawing circle. Analysis result shows that the average error of surrounding rock temperature is no more than 0.6℃, the error of thawing circle depth is no more than 10%, so the calculated value has better accordance with the measured value. When the time of operating shotcrete delays 1 d, the thawing circle depth increases by10 cm. When the thickness of shotcrete increases by 5cm, the thawing circle depth increases by about 10 cm. The thawing circle depth with molding temperature of 15 ℃ for the first molding concrete increases by about 10 cm compared to the molding temperature of 5 ℃. When the thickness of insulation board increases from 5cm to 20 cm, the thawing circle depth decreases by2/3. The insulation board and the hydration heat of secondary molding concrete have big influence on the thawing circle depth. The thawing circle depth with wind speed of 3. 0m·s^-1 in hole decreases by 10-20 cm compared to wind speed of 1.0 m·s^-1 in hole. 30, 60, 90, 120 d after shotcrete being operated, the thawing circle depths at air temperature of 8 ℃ in hole are1. 25, 1. 31, 1. 35, 1. 40 times of thawing circle depths at air temperature of 2 ℃ in hole respectively. Obviously, air temperature in hole should be controlled at 3 ℃-5 ℃, the support should be operated as early as possible after surrounding rock excavation, and low heat or medium heat cement should be used to decrease the hydration heat released by concrete.
- tunnel engineering /
- thawing circle /
- finite element /
- permafrost region /
- support structure

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图 1 姜路岭隧道洞口

Figure 1. Portal of Jiangluling Tunnel

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图 2 围岩温度传感器安装现场

Figure 2. Installation scenes of temperature sensor for surrounding rock

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图 3 不同深度处的围岩温度-时间曲线

Figure 3. Curves of surrounding rock temperature versus time at different depths

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图 4 融化圈深度-时间曲线

Figure 4. Curve of thawing circle depth versus time

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图 5 有限元计算模型

Figure 5. Finite element calculation model

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图 6 融化圈深度计算值与实测值的对比

Figure 6. Comparison of calculated values and measured values for thawing circle depth

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图 7 围岩温度计算值与实测值的对比

Figure 7. Comparison of calculated values and measured values for surrounding rock temperature

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图 8 不同工况下围岩的融化圈深度

Figure 8. Thawing circle depths of surrounding rocks under different working conditions

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图 9 保温板两侧温度

Figure 9. Temperatures on two sides of insulation board

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图 10 不同保温板厚度下围岩的融化圈深度

Figure 10. Thawing circle depths of surrounding rocks with different thicknesses of insulation board

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图 11 不同洞内气温下围岩的融化圈深度

Figure 11. Thawing circle depths of surrounding rocks under different air temperatures in hole

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表 1 监测频率

Table 1. Monitoring frequencies

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表 2 对流换热系数

Table 2. Convective heat transfer coefficients

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表 3 岩石、水与水热物理参数

Table 3. Thermal physical parameters of rocks, water and ice

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表 4 页岩的热物理参数

Table 4. Thermal physical parameters of shale

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表 5 凝灰岩的热物理参数

Table 5. Thermal physical parameters of tuff

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表 6 衬砌的热物理参数

Table 6. Thermal physical parameters of lining

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表 7 混凝土的质量配合比

Table 7. Quality mixture ratios of concretes

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表 8 不同施作时机下围岩的融化圈深度

Table 8. Thawing circle depths of surrounding rocks with different operating times

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表 9 不同喷射混凝土厚度下围岩的融化圈深度

Table 9. Thawing circle depths of surrounding rocks under different shotcrete thicknesses

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表 10 不同入模温度下围岩的融化圈深度

Table 10. Thawing circle depths of surrounding rocks under different molding temperatures

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表 11 有、无保温板时围岩的融化圈深度

Table 11. Thawing circle depths of surrounding rocks with and without insulation board

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表 12 不同洞内风速下围岩的融化圈深度

Table 12. Thawing circle depths of surrounding rocks under different wind speeds in hole

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