Soil deformation analysis of expansive soil slope bolt pull-out test before and after soaking
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摘要: 锚杆锚固失效主要表现为锚固体与周围土体产生相对位移，当应用在膨胀土边坡时，锚杆加固对膨胀土的湿化膨胀的影响尚不清楚。为此，开展室内膨胀土边坡锚杆拉拔试验，并通过人工浸水方式模拟河道蓄水，利用GeoPIV8软件分析土体单元浸水前后实际的变形矢量图，研究锚杆在拉拔过程中的锚杆–土体变形规律。试验结果表明：越靠近锚固体顶端，锚固体在拉拔过程中对周边土体的影响范围越大，并沿着锚固体长度方向向内逐渐变小；浸水后边坡膨胀变形表现为埋深越浅的土体膨胀变形量越大；浸水后拉拔试验过程中锚固体对周围土体的影响范围呈现先增后减趋势，相对于浸水前试验，在阶段一其影响范围约为浸水前影响范围的4.4倍，至阶段二其影响范围约为浸水前影响范围的1.25倍，后逐步减小，至阶段三其影响范围约减至浸水前影响范围的40%。Abstract: The failure of bolt anchorage is mainly manifested as the relative displacement between the anchorage body and the surrounding soil. When applied to expansive soil slope, the influence of bolt reinforcement principle on the wetting expansion law of expansive soil is not clear. Therefore, the indoor expansive soil slope bolt pull-out test was carried out, and the artificial immersion method was used to simulate the river water storage. The actual deformation vector diagram of the soil unit before and after immersion is analyzed, and the software GeoPIV8 is used to study the deformation law of the bolt soil during the pull-out process. The test results show that the closer to the top of the anchorage body, the greater the influence range of the anchorage body on the surrounding soil during the drawing process, and gradually decreases along the length direction of the anchorage body. The expansion deformation of the slope after soaking shows that the shallower the buried depth, the greater the expansion deformation of the soil. Compared with the state of expansive soil before soaking, the influence range of anchor body on surrounding soil after soaking first increases to 4.4 times of its range during drawing process, and then gradually decreases to 40% of that before soaking.
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Key words:
- expansive soil slope /
- anchor rod /
- pull-out test /
- side slope support
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图 5 浸水前后锚杆荷载−位移曲线
Figure 5. Load−displacement curve of bolt before and after immersion
图 7 阶段三B3锚固体周边土体的位移矢量图
Figure 7. The displacement vector diagram of the soil around the B3 anchorage body in stage three
图 8 浸水前锚杆B3在拉拔过程中对周边土体的影响范围
Figure 8. Influence range of bolt B3 on the surrounding soil during the drawing process before immersion
图 10 阶段三B3锚固体周边土体的位移矢量图
Figure 10. Stage three B3 anchor solid surrounding soil displacement vector diagram
图 11 浸水后锚杆B8在拉拔过程中对周边土体的影响范围
Figure 11. Influence range of the bolt B8 on the surrounding soil during the drawing process after soaking
表 1 室内膨胀土边坡锚杆拉拔试验锚杆参数
Table 1. Anchor parameters of indoor expansive soil slope bolt pull-out test
锚杆编号 是否浸水 杆体直径/mm 锚固长度/cm 锚固体直径/mm B1 否 8 70 50 B2 否 8 65 50 B3 否 8 60 50 B4 否 8 55 50 B5 否 8 50 50 B6 是 8 70 50 B7 是 8 65 50 B8 是 8 60 50 B9 是 8 55 50 B10 是 8 50 50 
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表 2 土样的物理性质指标
Table 2. Physical properties of soil samples
wL/% wp/% Ip wop/% ρdmax/(g·cm−3) δ ef/% 47.5 25.9 21.6 23.0 1.56 61
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表 3 浸水前后锚固体影响范围分布
Table 3. Distribution of influence range of anchorage body before and after soaking
是否浸水 阶段一 阶段二 阶段三 否 0.12D 2.4D 3.8D 是 0.53D 3D 1.54D
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