【摘要】：采用透明土材料和粒子圖像測(cè)速法(PIV)技術(shù),通過物理模型試驗(yàn)研究錨桿拔出機(jī)理。在模型試驗(yàn)中采用A、B兩種不同尺寸的連續(xù)球體錨桿錨固段,試驗(yàn)獲得各錨桿錨固段上移對(duì)周圍土體的擾動(dòng)規(guī)律、錨桿位移與錨固力變化曲線以及拔出破壞時(shí)破裂面的位置及形狀。通過分析連續(xù)球體錨桿錨固段的極限承載力和錨固段破壞機(jī)理,推導(dǎo)出連續(xù)球體錨桿抗拔力的計(jì)算公式。試驗(yàn)結(jié)果分析表明:本文試驗(yàn)條件下,錨桿拔出時(shí)豎向位移最大影響范圍與連續(xù)球體的半徑和間距有直接關(guān)系;A、B型連續(xù)球體錨桿的極限承載力,分別比普通圓柱型錨桿提高52%和117%;連續(xù)球體錨桿錨固段在上拔破壞過程中抗拔力的貢獻(xiàn)可分為3個(gè)部分:直桿與土層的黏結(jié)、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.
【作者單位】： 武漢理工大學(xué)土木工程與建筑學(xué)院;School
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(51374163)
【分類號(hào)】：TU476

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