考虑材料变形和破坏特性的强度折减方法研究

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摘要基于材料峰后渐进破坏过程，给出符合岩土材料变形、破坏规律的边坡和坝基异步强度折减计算方法及基于Mohr-Coulomb准则的异步折减比确定方法。同时，针对岩体在不同应力状态和塑性变形程度时具有不同剪胀性能的特点，编写基于非线性ABAQUS有限元程序场变量接口的USDFLD子程序，实现剪胀角随最小主应力和塑性剪应变变化。最后，给出坝基算例分析。结果表明：(1) 水坝蓄水工作时，滑动面的应力水平明显增大，并引起滑动面岩体剪胀特性的变化，计算得到的坝基安全系数与相关联和非关联剪胀角下的安全系数均有显著差异；(2) 不同异步折减比时，坝基安全系数随异步折减比的增大而明显减小。因此，考虑岩土材料真实变形规律和破坏过程的安全系数才能正确表征边坡和坝基稳定性。所得结果可为大型边坡及坝基优化设计方案和稳定性评价提供依据。

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关键词 ：岩石力学, 坝基, 异步强度折减, 峰后特性, Mohr-Coulomb准则, ABAQUS

Abstract：Based on post-peak progressive failure process of material，the slope and dam foundation asynchronous strength reduction method conforming to the geotechnical materials deformation and failure law is proposed. And the calculation method of asynchronous reduction ratio is given based on Mohr-Coulomb criterion. Meanwhile，considering the different dilatancy properties of rock mass with different stress states and plastic deformation，the user subroutine USDFLD is compiled using the field variable interface of ABAQUS program. Then the dilatancy angle will varies with the minimum principal stress and plastic shear strain. Finally，an example is analyzed. The results show that：(1) At the working state of hydropower station，the stress level of the potential sliding surface stress is enhanced significantly，and it changes the dilatancy characteristics of rock mass on sliding surface. The factors of safety of dam foundation are obviously different from those with associated and non-associated dilatancy angles. (2) The factor of safety decreases significantly with the increase in asynchronous reduction ratio. Therefore，only considering the geotechnical materials′ real deformation law and failure process can correctly represent the factors of safety of slope and dam foundation. The analysis can provide meaningful results for the optimization design and stability estimation of large scale slope and dam foundation engineering.

Key words： rock mechanics dam foundation asynchronous strength reduction post-failure characteristics Mohr-Coulomb criterion ABAQUS

收稿日期: 2010-04-06

引用本文:

张强，葛修润，王水林，李春光. 考虑材料变形和破坏特性的强度折减方法研究[J]. 岩石力学与工程学报, 2011, 30(S1): 2764-2769.
ZHANG Qiang，GE Xiurun，WANG Shuilin，LI Chunguang. STUDY OF STRENGTH REDUCTION METHOD CONSIDERING MATERIAL DEFORMATION AND FAILURE CHARACTERISTICS. , 2011, 30(S1): 2764-2769.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/2764

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