| 柔性均布压力加载装置在模型试验中的应用研究 |
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| 引用本文： | 李术才,王 琦,李为腾,李 智,王洪涛,江 贝,张红军.柔性均布压力加载装置在模型试验中的应用研究[J].岩土力学,2014,35(1):61-66. |
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| 作者姓名： | 李术才 王 琦 李为腾 李 智 王洪涛 江 贝 张红军 |
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| 作者单位： | 山东大学 岩土与结构工程研究中心，济南 250061 |
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| 基金项目： | 国家自然科学基金青年科学基金项目(No. 51304125)；高等学校博士学科点专项科研基金(No. 20130131120090)；山东省优秀中青年科学家科研奖励基金(No. BS2013NJ004) |
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| 摘 要： | 将研制的新型柔性均布压力加载装置与传统的刚性加载装置分别应用到大型地质力学模型试验中，利用应力不均匀系数? 对其加载效果进行了量化对比分析。试验结果表明，随着加载压力值与距模型表面距离的增加，不均匀系数? 减小，压力分布趋于均匀；在模型试验中采用柔性均布压力加载装置，与刚性加载方式相比，其更有利于加载压力在模型体中均匀扩散，产生均匀的应力场，在该试验条件下采用此装置，模型内距模型表面300 mm处应力场已基本达到均匀的状态，模型初始应力施加完后，其? 仅为0.086，而采用刚性加载方式时其对应的? 则高达0.283；该装置在距模型表面较近时或加载压力较小时亦能产生较好的均布压力加载效果，如加载压力为0.28 MPa时距模型表面150 mm处? 仅为0.174，具有减小边界效应影响范围、提高低应力水平下的模型试验精度的作用。
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| 关 键 词： | 刚性加载 柔性均布压力加载装置 模型试验 应力不均匀系数 对比分析 |
| 收稿时间： | 2012-10-09 |
Research on application of flexible uniform pressure loading device to model test |
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| LI Shu-cai,WANG Qi,LI Wei-teng,LI Zhi,WANG Hong-tao,JIANG Bei,ZHANG Hong-jun.Research on application of flexible uniform pressure loading device to model test[J].Rock and Soil Mechanics,2014,35(1):61-66. |
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| Authors: | LI Shu-cai WANG Qi LI Wei-teng LI Zhi WANG Hong-tao JIANG Bei ZHANG Hong-jun |
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| Institution: | Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China |
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| Abstract: | The developed flexible uniform pressure loading device and traditional rigid loading device are applied to large-scale geomechanical model test, of which loading effect is comparatively analyzed by using the stress nonuniformity coefficient ?. The test results show that, with the loading stress and the distance from the surface increasing, the stress nonuniformity coefficient ? decreases, and stress distribution tends to uniform. Comparing to the rigid loading method, flexible uniform pressure loading device is more beneficial to uniform stress dispersion and forming uniform stress field. With the flexible uniform pressure loading device being applied to the test, the stress field is nearly uniform where the depth from the surface is 300 mm in the test condition; and the ? is 0.086 when the initial stress has been applied; and the corresponding ? is 0.283 with rigid loading method applied in the test. Even though the distance from the surface is short or the loading stress is low, the flexible uniform pressure loading device also produces a good uniform loading effect, and when the on-load pressure is 0.28 MPa, the ? is only 0.174 where the depth from the surface is 150 mm. The device has the function of reducing range of boundary effect and improving model test accuracy. |
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| Keywords: | rigid loading flexible uniform pressure loading device model test stress nonuniformity coefficient comparative analysis |
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