柔性均布压力加载装置在模型试验中的应用研究

发布时间：2018-05-02 09:24

本文选题：刚性加载 + 柔性均布压力加载装置　；参考：《岩土力学》2014年01期

【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。
[Abstract]:The new flexible uniform pressure loading device and the traditional rigid loading device are applied to the large-scale geomechanical model test respectively. The loading effect is compared and analyzed quantitatively by using the stress nonuniformity coefficient. The experimental results show that with the increase of loading pressure and distance from the surface of the model, the non-uniform coefficient decreases and the pressure distribution tends to be uniform, and the flexible uniform pressure loading device is used in the model test, which is compared with the rigid loading mode. It is more favorable to the uniform diffusion of the loading pressure in the model body and the uniform stress field. Under this experimental condition, the stress field of the model has basically reached a uniform state at 300 mm from the surface of the model, and the initial stress of the model is applied after the initial stress is applied. It is only 0.086, and when rigid loading is adopted, the corresponding value is as high as 0.283. The device can also produce a better uniform pressure loading effect when it is close to the surface of the model or when the loading pressure is small. For example, the loading pressure of 0.28 MPa is only 0.174 mm from the surface of the model, which can reduce the influence range of the boundary effect and improve the precision of the model test at the low stress level.
【作者单位】：山东大学岩土与结构工程研究中心;
【基金】：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)
【分类号】：TU411

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