| 裂隙岩体不均匀冻胀性研究 |
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| 引用本文： | 夏才初,王岳嵩,郑金龙,吕志涛.裂隙岩体不均匀冻胀性研究[J].岩土力学,2020,41(4):1161-1168. |
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| 作者姓名： | 夏才初 王岳嵩 郑金龙 吕志涛 |
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| 作者单位： | 1. 同济大学 土木工程学院 地下建筑与工程系，上海 200092；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092；
3. 四川省交通运输厅公路规划勘察设计研究院，四川 成都 610041 |
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| 基金项目： | 国家自然科学基金（No.51778475，No.41472248）；四川省交通运输厅科技项目（No.2016B2-4）。 |
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| 摘 要： | 隧道冻胀力是引起隧道冻害的主要原因之一,隧道冻胀力主要由围岩不均匀冻胀引起。裂隙的存在会对岩体不均匀冻胀产生进一步影响,因此推导了岩体不均匀冻胀系数k_θ的计算公式,并获得岩体不均匀冻胀系数k_θ的相关规律。(1)岩体不均匀冻胀系数随裂隙与冻结方向的夹角θ的增大而增大。(2)温度梯度增加,岩体的不均匀冻胀系数k_θ增加,岩体的不均匀冻胀性增强。(3)裂隙率对岩体不均匀冻胀的影响需要考虑到裂隙与温度梯度夹角q,当裂隙与温度梯度的夹角q较小时,岩体不均匀冻胀系数k_θ随裂隙率的增加而减小;当裂隙与温度梯度的夹角θ较大时,岩体不均匀冻胀系数k_θ随裂隙率的增加而增大。(4)裂隙对岩体不均匀冻胀的影响程度与岩体的岩性有关,裂隙对孔隙率小的岩体影响较大。根据推导的裂隙岩体不均匀冻胀系数计算公式,计算得到了不同岩性不同级别含裂隙围岩的不均匀冻胀系数范围,从而,在寒区隧道设计中可以更精确地计算隧道围岩作用于衬砌上的冻胀力,对寒区隧道工程的设计具有重要作用,对路基、边坡等寒区工程冻胀力的研究也可起到推动作用。
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| 关 键 词： | 岩体 裂隙 不均匀冻胀系数 |
| 收稿时间： | 2019-04-17 |
| 修稿时间： | 2019-07-21 |
Study of differential frost heave of fractured rock mass |
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| XIA Cai-chu,WANG Yue-song,ZHENG Jin-long,Lü Zhi-tao.Study of differential frost heave of fractured rock mass[J].Rock and Soil Mechanics,2020,41(4):1161-1168. |
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| Authors: | XIA Cai-chu WANG Yue-song ZHENG Jin-long LÜ Zhi-tao |
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| Institution: | 1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Sichuan Provincial Transport Department Highway Planning, Survey, Design, and Research Institute, Chengdu, Sichuan 610041, China |
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| Abstract: | The frost heave force is one of the main reasons that induces the tunnel freezing damage.The frost heave force of tunnel is mainly caused by the differential frost heave of surrounding rock.The fracture will further affect the differential frost heave of rock mass.In this article,the calculation formulation for differential frost heave coefficient k_θof rock mass is derived,and some findings concerning the coefficient of differential frost heave k_θare drawn as follows.The differential frost heave coefficient increases with increasing the angle q between fracture and temperature gradient.As temperature gradient rises,the differential frost heave coefficient increases.The influence of fracture ratio on differential frost heave of surrounding rock depends on the angle q between fracture and temperature gradient.Whenθis small,k_θdecreases with the increase of fracture ratio.Whenθis large,k_θincreases with the increase of fracture ratio.The influence of fracture on differential frost heave of rock mass is related to the lithology of rock mass.The fracture has greater influence on the rock mass with smaller porosity.According to the calculation formula of differential frost heave coefficient of fissured rock mass,the range of differential frost heave coefficient of fissured rock mass with different lithology and different grades can be obtained.Therefore,in the design of tunnel in cold area,the frost heave force of tunnel surrounding rock acting on lining can be calculated more accurately,which plays an important role in the design of tunnel in cold area,and also promotes studies of the frost heave force of subgrade,slope and other projects in cold area. |
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| Keywords: | rock mass fracture differential frost heave coefficient |
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