| 饱水度对砂岩模量及强度影响的三轴试验 |
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| 引用本文： | 张春会,赵全胜.饱水度对砂岩模量及强度影响的三轴试验[J].岩土力学,2014,35(4):951-958. |
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| 作者姓名： | 张春会 赵全胜 |
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| 作者单位： | 河北科技大学 建筑工程学院，石家庄 050018 |
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| 基金项目： | 国家自然科学基金(No. 51274079，No.51174106)；河北省自然科学基金(No. E2013208148)。 |
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| 摘 要： | 为研究饱水度和围压对砂岩力学特性的影响,在不同围压和饱水度下开展三轴试验,获得了不同饱水度和围压下巴里坤砂岩的模量、峰值强度和残余强度,分析了饱水度和围压对砂岩模量、峰值强度和残余强度的影响规律,结果表明:(1)围压增加,砂岩的模量也增加,围压与模量之间近似为直线关系;饱水度增加,砂岩模量降低,单轴下饱和砂岩的模量降低50.9%;饱水度与砂岩模量之间近似服从直线或负指数函数关系。(2)饱水度增加,峰值强度下降;单轴条件下饱和砂岩的峰值强度下降了44.2%;饱水度与砂岩峰值强度之间近似服从自然对数关系。(3)强度退化指数可以较好地描述围压对残余强度的影响,巴里坤砂岩的强度退化指数与围压之间近似符合负指数关系;随着饱水度增加,砂岩的残余强度降低。(4)随着围压增加,饱水度对砂岩模量、峰值强度和残余强度的影响都减弱。(5)饱水度在60%以下时,饱水度变化对模量和峰值强度的影响显著,当饱水度超过60%后,模量和峰值强度仍随着饱水度增加而降低,但变化速率趋缓;对于残余强度,则饱水度在80%以下时影响显著。
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| 关 键 词： | 巴里坤砂岩 模量 峰值强度 残余强度 三轴试验 饱水度 |
| 收稿时间： | 2014-01-26 |
Triaxial tests of effects of varied saturations on strength and modulus for sandstone |
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| ZHANG Chun-hui,ZHAO Quan-sheng.Triaxial tests of effects of varied saturations on strength and modulus for sandstone[J].Rock and Soil Mechanics,2014,35(4):951-958. |
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| Authors: | ZHANG Chun-hui ZHAO Quan-sheng |
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| Institution: | School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China |
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| Abstract: | To obtain the effects of varied saturations and confining pressures on mechanical properties of sandstone, the triaxial tests on sandstone samples from Balikun mine were performed under varied saturation and confining pressures. Then the modulus, peak strength and residual strength were obtained. The effects of varied saturations and confining pressures on mechanical properties of Balikun’s sandstone were analyzed; and the results show that: (1) With confining pressure increasing, the sandstone modulus increases, and the relationship between confining pressure and modulus follows linear form. With saturation increasing, the modulus decreases. The uniaxial compression modulus of saturated sandstone decreases 50.9%. The relationship between saturation and modulus follows linear or negative exponential form. (2) With saturation increasing, the peak strength decreases. The uniaxial compression strength of saturated sandstone decreases 44.2%.The relationship between saturation and peak strength follows natural logarithm form. (3) The effects of confining pressure on residual strength can be described by degradation index. The relationship between degradation index and confining pressure of Balikun sandstone follows negative exponential form. With saturation increasing, the residual strength decreases. (4) With confining pressure increasing, the effects of varied saturation on modulus, peak strength and residual strength decrease. (5) Less than 60% of saturation, variation of saturation greatly influences the modulus and peak strength. Larger than 60%, the effects decrease. Less than 80% of saturation, variation of saturation greatly influences residual strength. |
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| Keywords: | Balikun sandstone modulus peak strength residual strength triaxial tests saturation |
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