透明土中连续球体型锚杆拔出机理研究
发布时间：2019-06-12 17:58
【摘要】：采用透明土材料和粒子图像测速法(PIV)技术,通过物理模型试验研究锚杆拔出机理。在模型试验中采用A、B两种不同尺寸的连续球体锚杆锚固段,试验获得各锚杆锚固段上移对周围土体的扰动规律、锚杆位移与锚固力变化曲线以及拔出破坏时破裂面的位置及形状。通过分析连续球体锚杆锚固段的极限承载力和锚固段破坏机理,推导出连续球体锚杆抗拔力的计算公式。试验结果分析表明:本文试验条件下,锚杆拔出时竖向位移最大影响范围与连续球体的半径和间距有直接关系;A、B型连续球体锚杆的极限承载力,分别比普通圆柱型锚杆提高52%和117%;连续球体锚杆锚固段在上拔破坏过程中抗拔力的贡献可分为3个部分:直杆与土层的黏结、肩部端承力和黏土黏聚力。
[Abstract]:Using transparent soil material and particle image velocimeter (PIV) technology, the pullout mechanism of anchor rod was studied by physical model test. In the model test, two kinds of continuous sphere bolt anchoring sections of different sizes are used to obtain the disturbance law of each anchor section to the surrounding soil, the variation curve of bolt displacement and anchoring force, and the position and shape of the fracture surface when pulling out the failure. Based on the analysis of the ultimate bearing capacity of the anchor section of the continuous sphere bolt and the failure mechanism of the anchor section, the formula for calculating the pullout force of the continuous sphere bolt is derived. The analysis of the test results shows that the maximum influence range of vertical displacement of anchor rod is directly related to the radius and spacing of continuous sphere, and the ultimate bearing capacity of A and B type continuous sphere anchor rod is 52% and 117% higher than that of ordinary cylindrical bolt, respectively, and the ultimate bearing capacity of A and B type continuous sphere anchor rod is 52% and 117% higher than that of ordinary cylindrical bolt, respectively. The contribution of pullout force of continuous sphere anchor rod in the process of uplift failure can be divided into three parts: the bond between straight rod and soil layer, the end bearing force of shoulder and the cohesion of clay.
【作者单位】： 武汉理工大学土木工程与建筑学院;School
【基金】：国家自然科学基金面上项目(51374163)
【分类号】：TU476
[Abstract]:Using transparent soil material and particle image velocimeter (PIV) technology, the pullout mechanism of anchor rod was studied by physical model test. In the model test, two kinds of continuous sphere bolt anchoring sections of different sizes are used to obtain the disturbance law of each anchor section to the surrounding soil, the variation curve of bolt displacement and anchoring force, and the position and shape of the fracture surface when pulling out the failure. Based on the analysis of the ultimate bearing capacity of the anchor section of the continuous sphere bolt and the failure mechanism of the anchor section, the formula for calculating the pullout force of the continuous sphere bolt is derived. The analysis of the test results shows that the maximum influence range of vertical displacement of anchor rod is directly related to the radius and spacing of continuous sphere, and the ultimate bearing capacity of A and B type continuous sphere anchor rod is 52% and 117% higher than that of ordinary cylindrical bolt, respectively, and the ultimate bearing capacity of A and B type continuous sphere anchor rod is 52% and 117% higher than that of ordinary cylindrical bolt, respectively. The contribution of pullout force of continuous sphere anchor rod in the process of uplift failure can be divided into three parts: the bond between straight rod and soil layer, the end bearing force of shoulder and the cohesion of clay.
【作者单位】： 武汉理工大学土木工程与建筑学院;School
【基金】：国家自然科学基金面上项目(51374163)
【分类号】：TU476
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