| 不同温度梯度冻结中砂加卸荷变形特性研究 |
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| 引用本文： | 赵晓东,周国庆,李生生.不同温度梯度冻结中砂加卸荷变形特性研究[J].中国矿业大学学报,2010,39(2). |
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| 作者姓名： | 赵晓东 周国庆 李生生 |
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| 作者单位： | 1. 中国矿业大学深部岩土力学与地下工程国家重点实验室建筑工程学院,江苏徐州,221008
2. 天地科技北京中煤矿山有限公司北京,100013 |
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| 基金项目： | 国家自然科学基金重点项目，国家科技支撑计划重点项目，中国矿业大学校科研和教改项目 |
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| 摘 要： | 采用K0固结,负荷冻结,加、卸荷的方法,进行了4种不同温度梯度冻结中砂的三轴试验,获得了温度梯度和加、卸荷过程对冻结中砂变形演变的影响规律.结果表明:温度梯度的存在增大了冻结中砂起始切线泊松比,抑制了冻结中砂最大体缩量;不同温度冻结中砂加、卸荷过程中均呈现出体缩—体胀趋势,但不同温度梯度以及加、卸荷条件下的体缩速率和最大体缩量差异很大,且随温度梯度增加,体缩—体胀规律逐渐向持续体胀演变;卸荷过程增大了径向变形演化速率,抑制了冻结中砂体缩的发展,这一规律能合理解释加荷过程中获得的冻土强度高于卸荷过程的基本结论.
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| 关 键 词： | 温度梯度 冻结中砂 加、卸荷 变形 抑制效应 |
Deformation Properties of Frozen Sand During Loading and Unloading in the Presence of a Thermal Gradient |
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| ZHAO Xiao-dong,ZHOU Guo-qing,LI Sheng-sheng.Deformation Properties of Frozen Sand During Loading and Unloading in the Presence of a Thermal Gradient[J].Journal of China University of Mining & Technology,2010,39(2). |
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| Authors: | ZHAO Xiao-dong ZHOU Guo-qing LI Sheng-sheng |
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| Affiliation: | ZHAO Xiao-dong1,ZHOU Guo-qing1,LI Sheng-sheng2(1. State Key Laboratory for Geomechanics , Deep Underground Engineering,School of Architecture , Civil Engineering,China University of Mining & Technology,Xuzhou,Jiangsu 221008,China,2. Ti,i science , technology Co Ltd,Beijing 10013,China) |
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| Abstract: | Frozen sand was subjected to triaxial loading and unloading in the presence of four temperature gradients. The sand had undergone K0 consolidation before being frozen. The effect of the gradient on stress and strain was investigated. The initial tangential Poisson's ratio increases and the maximum volume contraction of the frozen sand is reduced due to the gradient. Volume strain during loading and unloading is presented as a function of temperature gradient in the sand. The rate and magnitude of contractio... |
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| Keywords: | temperature gradients frozen medium sand loading and unloading deformation restraining effects |
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