温度作用下砂岩损伤劣化本构模型研究
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摘要
砂岩在对温度变化的响应和敏感性上表现出显著的差异性,温度作用下砂岩的损伤劣化将对边坡稳定产生重要影响.基于此,在不同温度、孔隙水压、围压作用下砂岩试验数据基础上,根据三轴压缩应力-应变曲线特点,运用连续损伤理论和统计方法,选取弹性模量作为损伤变量,推导砂岩在温度及水压作用下的损伤演化方程,建立考虑温度效应和水压作用的砂岩损伤本构模型.对比分析表明,建立的本构模型计算理论与实际试验曲线吻合较好,说明建立的本构方程可以较好地反映温度作用下砂岩损伤效应.
Sandstone shows remarkable difference in response and sensitivity to temperature change;therefore the damage and degradation of sandstone under temperature action will play an important role in slope stability.Based on the test data of sandstone under different temperatures,pore water pressures and confining pressures and the characteristics of triaxial compression stress-strain curve,continuum damage theory and statistical method are used;and the elastic modulus is selected as the damage variable;meanwhile,the damage evolution equation of sandstone under the influence of temperature and hydraulic pressure is deducted;and the damage constitutive model of sandstone is established considering the temperature effect and hydraulic pressure action.The comparative analysis shows that the established constitutive model agrees well with the actual test curve,which shows that the established constitutive equation can well reflect the damage effect of sandstone under temperature action.
Sandstone shows remarkable difference in response and sensitivity to temperature change;therefore the damage and degradation of sandstone under temperature action will play an important role in slope stability.Based on the test data of sandstone under different temperatures,pore water pressures and confining pressures and the characteristics of triaxial compression stress-strain curve,continuum damage theory and statistical method are used;and the elastic modulus is selected as the damage variable;meanwhile,the damage evolution equation of sandstone under the influence of temperature and hydraulic pressure is deducted;and the damage constitutive model of sandstone is established considering the temperature effect and hydraulic pressure action.The comparative analysis shows that the established constitutive model agrees well with the actual test curve,which shows that the established constitutive equation can well reflect the damage effect of sandstone under temperature action.
引文
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[2]邓华锋,胡安龙,李建林,等.水岩作用下砂岩劣化损伤统计本构模型[J].岩土力学,2017,38(3):631-639.
[3]刘桃根,王伟,吴斌华,等.基于损伤力学的砂岩蠕变模型研究与参数辨识[J].三峡大学学报(自然科学版),2010,32(6):55-60.
[4]胡昕,洪宝宁,孟云梅.考虑含水率影响的红砂岩损伤统计模型[J].中国矿业大学学报,2007(5):609-613.
[5]王伟,吕军,王海成,等.砂岩流变损伤模型研究及其工程应用[J].岩石力学与工程学报,2012,31(S2):3650-3658.
[6]左建平,周宏伟,谢和平,等.温度和应力耦合作用下砂岩破坏的细观试验研究[J].岩土力学,2008,29(6):1477-1482.
[7]邓华锋,李建林,邓成进,等.岩石力学试验中试样选择和抗压强度预测方法研究[J].岩土力学,2011,32(11):3399-3403.
[8]曹广祝,仵彦卿,丁卫华,等.单轴-三轴和渗透水压条件下砂岩应变特性的CT试验研究[J].岩石力学与工程学报,2005,24(S2):5733-5739.
[9]姜桥.渗透水压作用下砂岩卸荷力学特性试验研究[D].宜昌:三峡大学,2015.
[10]胡亚运.水-岩作用下三峡库区层理砂岩卸荷力学特性研究[D].宜昌:三峡大学,2016.