砂土中锚板拉拔模型试验及其抗拔力计算

发布时间：2018-07-02 09:43

本文选题：锚板型式 + 上拔承载特性　；参考：《岩土工程学报》2015年11期

【摘要】：锚板基础因其具有良好的抗拔特性而广泛应用于各类岩土工程问题中。在不同密实程度砂土中采用不同几何形状的锚板进行小比尺拉拔模型试验,分析锚板型式及尺寸对上拔承载特性的影响。试验结果表明,相同直径和埋深比的螺旋锚与平板锚上拔承载特性无明显差别;相同埋深比时,直径为50 mm的锚板上拔承载力系数略小于直径为20mm锚板的上拔承载力系数,而其上拔破坏位移比明显高于小直径锚板。进一步根据破坏位移比与埋深比关系曲线确定中密及密砂中浅、深破坏模式的临界埋深比,同时结合已有试验结果假设两种破坏模式的滑裂面,利用极限平衡分析推导并给出两种破坏模式下上拔承载力公式;通过与41个拉拔试验数据进行比较,验证了所提理论公式的适用性及准确性。
[Abstract]:Anchor-plate foundation is widely used in geotechnical engineering because of its good anti-drawing property. The small scale drawing model test was carried out in sand with different geometric shapes in sand with different compactness. The influence of the type and size of anchor plate on the load-bearing characteristics of uplift was analyzed. The test results show that there is no significant difference between the uplift bearing capacity of the helical anchor with the same diameter and the ratio of buried depth to that of the flat anchor, and the uplift bearing capacity coefficient of the anchor plate with the diameter of 50 mm is slightly smaller than that of the 20mm anchor plate with the same ratio of buried depth. However, the ratio of uplift failure displacement is obviously higher than that of small diameter anchor plate. Furthermore, according to the relationship curve of the ratio of failure displacement to buried depth, the critical burying depth ratio of medium dense, medium shallow and deep sand failure modes is determined, and the sliding fracture surface of the two failure modes is assumed in combination with the experimental results. The formula of uplift bearing capacity under two failure modes is deduced and given by using limit equilibrium analysis, and the applicability and accuracy of the proposed theoretical formula are verified by comparing it with 41 drawing test data.
【作者单位】：东北电力大学建筑工程学院;海南省电力设计研究院;
【基金】：国家自然科学基金项目(51308095,51409045,51308094) 吉林省科技厅青年科研基金项目(20130522068JH)
【分类号】：TU476

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