›› 2018, Vol. 39 ›› Issue (6): 1973-1980.doi: 10.16285/j.rsm.2016.2076

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Creep life estimation of soft rock based on the complete stress-strain curve

XU Hong-fa1, BAI Zhun1, QI Liang-liang1, GENG Han-sheng1, MA Lin-jian1, LIU Bin1, 2   

  1. 1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, National Defense Engineering College, Army Engineering University of PLA, Nanjing, Jiangsu 210007, China; 2. Troops 68023, Lanzhou, Gansu 730050, China
  • Received:2016-11-09 Online:2018-06-11 Published:2018-07-03
  • Supported by:

    This work was supported by the Natural Science Foundation of Jiangsu Province (BK20141067).

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Abstract: 软岩的蠕变寿命是岩石流变学研究的重要内容之一，是影响岩土工程长期稳定的重要因素。根据Goodman原理，蠕变破坏点位于全应力-应变曲线的下降段（破坏段）上。当等时应力-应变曲线簇用分离变量函数表达时，证明了对于给定应变 处的等时应力-应变曲线的切线模量比和割线模量比随时间的变化规律相同。将破坏段曲线简化为直线，等时应力-应变曲线与破坏段的交点（蠕变破坏点）近似等于等时应力-应变曲线上某点 的切线与下降段直线的交点，进而推导出了该交点的蠕变寿命的表达式。 越接近峰值应变，误差越小。这样，可由短时蠕变曲线簇变换到等时应力-应变曲线簇，通过拟合方法求出给定应变 下模量比随时间变化的表达式；再由全应力-应变曲线求出峰值应力与应变、给定应变 下的应力与切线模量、下降段直线斜率等参数；即可得到软岩的蠕变寿命和长期强度。利用本文方法，对某泥岩的蠕变寿命进行了求解，得到了蠕变寿命随应力水平变化的表达式和长期强度值，理论结果与试验结果较吻合。

Key words: 全应力-应变曲线, 软岩流变, 等时应力-应变曲线, 蠕变寿命, 长期强度, 模量时间效应

CLC Number: 

  • TU 452

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