| 考虑断面及纵向施工效应时支护圆形洞室黏弹解析分析 |
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| 引用本文： | 王华宁,曹志远,李悦. 考虑断面及纵向施工效应时支护圆形洞室黏弹解析分析[J]. 岩土工程学报, 2011, 33(8): 1159-1166 |
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| 作者姓名： | 王华宁 曹志远 李悦 |
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| 作者单位： | 同济大学航空航天与力学学院,上海 200092 |
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| 基金项目： | 国家自然科学基金项目(10702052); 上海市自然科学基金项目(11ZR1438700) |
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| 摘 要： | 针对深埋圆形洞室,用半径时变函数模拟断面开挖过程,引入空间影响系数对力学模型进行修正以考虑纵向开挖影响。当岩体模拟为任一黏弹性材料时,将方程拉普拉斯变换求得位移通解,逆变换后代入边界条件确定待定函数,最终得到用洞周面力表达的围岩应力、位移统一解。区分开挖与支护时段,利用围岩与支护接触条件建立关于支护力的积分方程。当取 Boltzmann 黏弹模型时,求解积分方程得到支护力的确切表达,并可求得开挖过程及任意时刻支护后应力、位移分段解析表达。算例分析表明,纵向推进速度越大,位移越大; 断面开挖较快时纵向推进速度对位移的影响越显著 。最终洞型和纵向推进速度均相同时,采用不同断面开挖速度且挖完立即支护时,开挖较快的情况位移变化较剧烈,而支护后最终稳定位移较小。但是,相应支护阶段产生的位移较大,支护力也较大。文中导出的解可用于计算圆形洞室半径任意开挖并加支护后的应力、位移,该方法也适用于其它黏弹模型岩体的施工分析。
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| 关 键 词： | 施工过程 支护 时变函数 解析分析 |
| 收稿时间： | 2010-06-04 |
Analytic researches on lined circular tunnels in viscoelastic rock mass considering effects of cross-section and longitudinal construction |
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| WANG Hua-ning,CAO Zhi-yuan,LI Yue. Analytic researches on lined circular tunnels in viscoelastic rock mass considering effects of cross-section and longitudinal construction[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(8): 1159-1166 |
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| Authors: | WANG Hua-ning CAO Zhi-yuan LI Yue |
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| Affiliation: | School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China |
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| Abstract: | The tunnel excavation and support are continuous processes.A time-varying function of radius is established to simulate the excavation process of a circular tunnel.The general solutions of stresses and displacements of viscoelastic rock mass with elastic support during construction are derived by the Laplace transformation method,which contains the undetermined supporting force.An integral equation for the supporting force is established based on the contact conditions between the rock mass and the support.... |
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| Keywords: | construction process support time-varying function analytic research |
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