岩质锚固边坡相似材料及锚固体模型拉拔试验研究

发布时间：2019-01-18 13:55

【摘要】：论文以国家自然科学基金项目为依托,以锚固岩质边坡大型振动台试验为背景,开展模型相似材料配比研究。主要针对水泥砂浆及岩石进行了相似材料的配比试验研究。试验选用的相似原材料有重晶石、铁精粉、石英砂、细砂、石膏、水泥、甘油等。试验以相似理论为依据,利用正交设计法安排试验方案,采用浇筑灌浆的方法制备试样。通过室内试验获得相似材料的主要物理力学参数,包括密度、抗压强度、弹性模量、抗拉强度、内摩擦角、黏聚力等。采用极差分析法和直观曲线图对相似材料的正交试验结果进行处理和分析。从试验结果中选择合适的配比,制备锚固体模型,进行拉拔试验。本次试验得了可靠的试验数据,对模型相似材料配比试验的研究具有一定的参考价值。主要研究工作如下:1、利用正交表设计了9组水泥砂浆相似材料配比方案,以及16组岩石相似材料配比方案,进行试验研究。2、通过敏感性分析,判断砂浆及岩石的相似材料正交试验中,各个物理力学参数的主要影响因素和次要影响因素,并结合直观曲线图,分析各种原材料对混合材料物理力学性质影响的规律。3、通过多元线性回归分析,得出试验指标与各因素之间的近似函数关系方程。4、通过锚固体模型拉拔试验,初步得到锚固体模型两个界面上受力情况,以及锚杆锚固长度对抗拔力的影响规律,验证了应变片测量两个界面上剪应力的可行性。
[Abstract]:Based on the project of the National Natural Science Foundation and the large shaking table test of Anchorage rock slope, this paper carries out the research on the matching ratio of the model similar materials. The ratio of similar materials to cement mortar and rock was studied. Similar raw materials are barite, iron powder, quartz sand, fine sand, gypsum, cement, glycerin and so on. Based on the similarity theory, the test scheme was arranged by orthogonal design method, and the sample was prepared by pouring grouting method. The main physical and mechanical parameters of the similar materials are obtained through laboratory tests, including density, compressive strength, modulus of elasticity, tensile strength, angle of internal friction, cohesion and so on. The orthogonal test results of similar materials were processed and analyzed by means of range analysis and visual graph. The Anchorage model was made by selecting the appropriate proportion from the test results and the drawing test was carried out. Reliable experimental data are obtained in this experiment, which has certain reference value for the study of model similar material ratio test. The main research work is as follows: 1. By using orthogonal table, 9 groups of cement mortar similar material proportioning schemes and 16 groups of rock similar material proportioning schemes are designed. 2, through sensitivity analysis, In the orthogonal test of similar materials for judging mortar and rock, the main and secondary influencing factors of each physical and mechanical parameter are analyzed, and the law of the influence of various raw materials on the physical and mechanical properties of mixed materials is analyzed in combination with intuitionistic curves. Through multivariate linear regression analysis, the approximate functional equation between the test index and various factors is obtained. 4. Through the pull out test of the anchor body model, the stress on the two interfaces of the anchor body model is preliminarily obtained. The effect of anchoring length on pull-out force is also discussed, and the feasibility of measuring shear stress at two interfaces by strain gauge is verified.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45

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