Analysis of numerical simulation of cutting high slope in coal measures stratum of highway based on the strength reduction method in FLAC3D
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摘要: 高速公路路堑边坡的稳定性对施工安全及施工进度存在重要的影响,而由于煤系地层特殊的物理及化学性质,其风化速度快且遇水极易软化,故煤系地层边坡相较于普通边坡具有较差的工程性质。本文基于强度折减法,利用FLAC3D软件对武深高速公路广东段煤系地层路堑高边坡的开挖过程和支护过程进行了数值模拟,分析了三级坡面开挖及锚杆、框架梁支护前后边坡位移场以及剪切应变增量的变化,并分别计算了开挖前后及支护前后边坡的稳定性系数,为后续边坡的设计与施工提供了技术参考。Abstract: The stability of highway cutting slope has an important influence on construction safety and construction progress.Because of the special physical and chemical properties of coal measures stratum, its weathering speed is fast and it is easy to soften when it meets water, so the slope of coal measures stratum has worse engineering properties than that of common slope.In this paper, based on strength reduction method, the excavation and support process of cutting high slope in coal measure stratum of Guang dong section of Wushen Highway are simulated by FLAC3D software.The changes of stress and displacement fields of slope before and after excavation of three-stage slope surface and bolt and frame beam support are analyzed, The corresponding stability coefficients of slope are calculated too, which provides technical reference for the design and construction of subsequent slope.
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Key words:
- FLAC3D /
- coal measures stratum /
- high cutting slope /
- strength reduction method /
- numerical simulation
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