低温热力耦合下岩体椭圆孔（裂）隙中冻胀力与冻胀开裂特征研究

黄诗冰; 刘泉声; 刘艳章; 程爱平

doi:10.11779/CJGE201803009

低温热力耦合下岩体椭圆孔（裂）隙中冻胀力与冻胀开裂特征研究 English Version

1. 武汉科技大学资源与环境工程学院,湖北武汉 430081;
2.冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉 430081;
3. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉 430071

基金项目: 湖北省自然科学重点项目（41702291,51604195）; 国家自然科学基金青年基金项目（51604195）

详细信息

作者简介:
黄诗冰(1989-),男,博士,2011年毕业于中国地质大学（武汉）土木工程专业,现任讲师,主要从事岩土工程方面的教学与研究工作。E-mail：huang1989.9@163.com。

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出版历程
- 收稿日期: 2017-01-16
- 发布日期: 2018-03-24

Frost heaving pressure and characteristics of frost cracking in elliptical cavity (crack) of rock mass under coupled thermal-mechanical condition at low temperature

1. School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan, 430081, China;
3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

摘要

摘要: 寒区岩体工程含水孔（裂）隙中低温水冰相变会产生冻胀力与温度应力,岩体冻融损伤与断裂是由温度应力和孔（裂）隙中的冻胀力共同作用的结果。考虑温度应力对椭圆孔（裂）隙形变的影响,推导了椭圆孔（裂）隙中的冻胀力解析方程;基于最大拉应力准则,得到了低温热力耦合下椭圆孔（裂）隙周围最大拉应力与冻胀开裂角,建立了椭圆孔可简化为椭圆裂隙进行冻胀计算的临界条件;最后采用改进的等效热膨胀系数方法对隧道单裂隙围岩冻胀力与裂隙尖端应力场进行了数值分析。研究结果表明：①椭圆孔中的最大冻胀力与岩石的热膨胀性、裂隙倾角和裂隙长短轴比χ等因素有关;②长短轴比χ≥10的扁平椭圆孔可简化为裂隙进行计算分析,此时冻胀基本发生在裂隙尖端且尖端拉应力集中明显;③改进的等效热膨胀系数方法可以很好的模拟裂隙中的冻胀力与裂尖应力场。
- 椭圆孔（裂）隙 /
- 冻胀力 /
- 温度应力 /
- 冻胀开裂角 /
- 裂尖应力场
Abstract: The frost heaving pressure is induced by water-ice phase transition in water-bearing cracks in addition to thermal stress at low temperature in rock engineering in cold regions. The freeze-thaw damage and cracking are caused by the combined action of frost heaving pressure with thermal stress. Considering the influence of thermal stress on elliptical cavity (crack), an analytical equation for the frost heaving pressure is deducted. Based on the maximum tensile-stress criterion, the maximum tensile stress and frost cracking angle on the elliptical cavity (crack) are derived. Besides, the critical condition for simplifying elliptical cavity to crack is also established under coupled thermo-mechanical condition at low temperature. Finally, the developed method for the equivalent thermal expansion coefficient is adopted to simulate the frost heaving pressure in crack and stress field at crack tip. The research results show that: (1) The maximum frost heaving pressure in the elliptical cavity is affected by the thermal expansion of rock, dip angle of crack, ratio of crack length to width χ and so on; (2) When χ≥10, the flat elliptical cavity can be simplified as the crack, and the frost cracking appears at the crack tip with obvious stress concentration; (3) The frost heaving pressure and stress field at crack tip can be well simulated by the developed method for the equivalent thermal expansion coefficient.
- elliptical cavity (crack) /
- frost heaving pressure /
- thermal stress /
- frost cracking angle /
- stress field at crack tip

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