考虑张拉–剪切渐进破坏的边坡强度折减法研究

doi:10.13722/j.cnki.jrme.2018.0213

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摘要针对边坡渐进破坏过程中局部岩土体强度参数不断劣化现象，采用应变软化模型代替传统的理想弹塑性模型，提出一种考虑张拉–剪切渐进破坏的强度折减法。从劣化函数、破坏判据、折减系数、滑动面显示和折减范围等方面对该方法进行研究；以极限塑性应变作为边坡点破坏准则，将破坏点从坡脚到坡顶贯通作为边坡整体破坏判据；基于弹塑性计算的初应力法，提出一种边坡张拉–剪切全滑动面定量显示指标。结果表明，应变软化模型所得塑性区明显小于理想弹塑性模型，考虑张拉破坏的边坡安全系数偏于危险；指标能同时显示并区分边坡潜在滑动面的张拉与剪切部分。该基于应变软化模型的计算方法进一步完善了边坡稳定性分析的强度折减法理论。

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	王伟
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关键词 ：边坡工程, 强度折减法, 张拉破坏, 渐进破坏, 应变软化模型

Abstract：The strength of rock deteriorates continuously during the progressive failure of slope and the strength reduction method to calculate the slope stability considering the tensile and shear progressive failure was therefore proposed employing the strain softening model instead of the ideal elasto-plastic model. The method was studied in terms of deterioration function，failure criterion，reduction factor，sliding surface display and reduction range. The ultimate plastic strain was used as the failure criterion for every point in the slope and all the points from the foot to the top of slope reaching the failure were taken as the failure criterion of whole slope. A quantitative index based on the initial stress method of elasto-plastic calculation was presented for displaying the complete sliding surface due to tension and shearing in the slope. The results showed that the plastic zone computed with the strain softening model is obviously smaller than that of ideal elastoplastic model，and the safety factor of slope considering tensile failure tend to be more dangerous. The tensile and shearing parts of the potential sliding surface of the slope can be displayed and distinguished at the same time by using the quantitative index.

Key words： slope engineering strength reduction method tensile failure progressive failure strain softening model

引用本文:

王伟，陈国庆，朱静，黄润秋. 考虑张拉–剪切渐进破坏的边坡强度折减法研究[J]. 岩石力学与工程学报, 2018, 37(9): 2064-2074.
WANG Wei，CHEN Guoqing，ZHU Jing，HUANG Runqiu. Slope stability calculated with strength reduction method considering tensile and shear progressive failure. , 2018, 37(9): 2064-2074.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0213 或 http://www.rockmech.org/CN/Y2018/V37/I9/2064

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