| 基于卸围压试验的砂岩卸荷本构模型及其应用 |
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| 引用本文： | 王兴霞,党莉.基于卸围压试验的砂岩卸荷本构模型及其应用[J].水电能源科学,2014,32(7):105-108,123. |
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| 作者姓名： | 王兴霞 党莉 |
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| 作者单位： | 三峡大学 水利与环境学院， 湖北 宜昌 443002;中国长江电力股份有限公司， 湖北 宜昌 443002 |
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| 基金项目： | 国家自然科学基金项目(51279091)；三峡大学科学基金项目(KJ2012B027) |
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| 摘 要： | 鉴于岩体本构模型受岩样应力路径、加卸载状态等因素的影响,为研究卸荷条件下砂岩的本构模型,采用RMT-150C岩石力学试验系统对宜昌砂岩岩样进行了升轴压峰前卸围压、轴压和围压等量减小两种应力路径下的卸围压试验。结果表明,卸荷应力路径不同时,卸荷变形阶段的应力—应变曲线形态有很大差异,但岩样变形模量随围压降低而劣化的规律一致;岩样卸荷破坏强度特征可用Hoek-Brown准则拟合。由此推导出增量形式的卸荷弹脆塑型本构模型,并以算例分析验证了该模型的正确性。
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| 关 键 词： | 砂岩 加卸荷 卸荷量 变形模量 卸荷本构关系 |
Constitutive Model of Sand Rock under Unloading Conditions Based on Unloading Confined Pressure Test and Its Application |
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| WANG Xingxia and DANG Li.Constitutive Model of Sand Rock under Unloading Conditions Based on Unloading Confined Pressure Test and Its Application[J].International Journal Hydroelectric Energy,2014,32(7):105-108,123. |
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| Authors: | WANG Xingxia and DANG Li |
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| Affiliation: | College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China;China Yangtze Power Co., Ltd., Yichang 443002, China |
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| Abstract: | In view of constitutive model of rock mass influenced by many factors, such as stress paths, loading-unloading state, complex stress-path triaxial unloading tests are conducted by using RMT-150C rock mechanics testing system, in order to study constitutive model of sand rock under unloading conditions. Test results show that although shapes of stress-strain curves are different due to various unloading paths, but the deformation modulus of rock samples is degraded to the same law when confined pressure decreasing. The strength failure characteristics of rock samples can be fitted by Hoek-Brown criterion. The deduced elastic-brittle-plastic constitutive model is suitable for unloading rock mass, whose correctness is verified by a concrete project example. |
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| Keywords: | sand rock loading and unloading unloading ratio deformation modulus unloading constitution relation |
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