基于Mohr-Coulomb与Drucker-Prager强度准则的数值模拟对比分析研究
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湖南科技大学

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TD322

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国家自然科学基金重点项目(51434006);国家自然科学基金面上项目(51874130);国家自然科学基金青年项目(51804109);湖南省自然科学基金资助项目(2018JJ3166)。


Comparative analysis studies by numerical simulation based on Mohr-Coulomb and Drucker-Prager strength criteria
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School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan

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    摘要:

    本文基于Mohr-Coulomb和Drucker-Prager强度准则,采用数值模拟软件,对比分析了两种强度准则下的直墙拱形巷道围岩变形破坏特征及其规律,计算结果既具有相似性,也存在差异性。(1)相似性:随着侧压力系数的增加,巷道围岩应力和塑性区分布形态基本不变,塑性区呈“蝶形”扩展,围岩峰值应力逐渐提高,巷道顶、底板位移不断增加;(2)差异性:不同侧压力系数下的巷道顶、底板和两帮位移和塑性区范围,在Mohr-Coulomb强度准则下比Drucker-Prager强度准则下的计算结果大,而在Drucker-Prager强度准则下的围岩峰值应力比在Mohr-Coulomb强度准则下的计算结果大。

    Abstract:

    Based on the Mohr-Coulomb and Drucker-Prager strength criteria, the numerical simulation software is used to compare and analyze the deformation and failure characteristics of surrounding rock of straight wall archway under two strength criteria. The calculation results under the two strength criteria have similarities and differences.(1) Similarity: With the increase of the lateral pressure coefficient, the surrounding rock stress and plastic zone distribution of the roadway are basically unchanged, and the plastic zone expands in a "butterfly" shape, the peak stress of the surrounding rock and the displacement of the tunnel roof and floor gradually increase;(2) Difference: For the peak stress of the surrounding rock, the displacement of the tunnel roof, floor and two gangs and the plastic zone range under different lateral pressure coefficients, the calculation results under the Mohr-Coulomb strength criterion are larger than those under the Drucker-Prager strength criterion. The peak stress of the surrounding rock under the Drucker-Prager strength criterion is larger than that under the Mohr-Coulomb strength criterion.

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  • 收稿日期:2019-01-20
  • 最后修改日期:2019-01-24
  • 录用日期:2019-02-09
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