双向均压数显相似材料试件制备装置的研制与应用
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山东科技大学

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国家自然科学(51974173,52004147);山东省自然科学基金(ZR2020QE129);煤炭开采水资源保护与利用国家重点实验室2020年开放基金(No.GJNY-20-113-19).


Development and Application of Similar Material Specimen Preparation Device for Two-way Equal Pressure Digital Display
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Shandong University of Science and Technology

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    摘要:

    相似材料模拟试验作为一种科学研究方法,在采矿工程领域研究巷道围岩体、顶底板岩层力学性质等方面得到了广泛应用。然而,传统相似材料试件制备装置制备的相似材料试件存在压实不均匀、上实下松等问题,导致制备的试件力学性质离散性大。针对上述问题,本文研制了双向均压数显相似材料试件制备装置,该装置能够实现双向均压、压力实时显现、自动脱模等功能。为验证本装置适用性和可靠性,开展了相似材料试件制备与单轴加载试验,试验结果表明,相较于传统模具,该装置制备的相似材料试件外观整体均匀密实、尺寸统一、加载面平整、无边角缺失现象;试件应力-应变曲线规律,物理力学性质表现稳定;试件阶段破坏特征明显,测试结果稳定性更高,试验数据更可靠。该装置的研制克服了传统装置配制过程捣锤敲击压实人力消耗大、制备效率低等缺点,对提高相似材料试件制备效率、降低实验结果离散性具有重要意义。

    Abstract:

    As a scientific research method, similar material simulation experiment has been widely used in the field of mining engineering to study the mechanical properties of roadway surrounding rock and roof and floor rock. However, the similar material specimens prepared by the traditional similar material specimen preparation device have problems such as uneven compaction and looseness, resulting in large dispersion of mechanical properties of the prepared specimens. In view of the above problems, this paper developed a two-way pressure equalization digital display similar material specimen preparation device, which can realize two-way pressure equalization, real-time pressure display, automatic demoulding and other functions. In order to verify the applicability and reliability of the device, the preparation and uniaxial loading test of similar material specimens were carried out. The test results show that compared with the traditional mold, the appearance of the similar material specimens prepared by the device is uniform and dense, the size is uniform, the loading surface is flat, and there is no corner missing phenomenon; he stress-strain curve of the specimen is regular, and the physical and mechanical properties are stable. The failure characteristics of the specimen are obvious, the test results are more stable and the test data are more reliable. The development of the device overcomes the shortcomings of large labor consumption and low preparation efficiency in the preparation process of the traditional device. It is of great significance to improve the preparation efficiency of similar material specimens and reduce the discreteness of experimental results.

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  • 收稿日期:2023-03-17
  • 最后修改日期:2023-03-17
  • 录用日期:2023-03-26
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