针对机械侵入荷载下格栅防护柔性埋地管道开展了室内模型试验，综合分析了筋材长度、埋深、间距和层数等参数对加筋效果的影响。试验结果表明：采用格栅防护埋地管道效果良好，模拟机械的钢板侵入体与格栅接触初期，加筋防护效果最为突出；当管道埋深相同且铺设一层筋材防护时，格栅长度由3D(D为管道外径)增至4D或将埋深u由0.5D增至D，钢板侵入相同深度时所需荷载分别增加了9.01%和11.8%，表明增加筋材长度或埋深可有效提高钢板侵入难度；筋材层间距较小时，筋材抵抗侵入荷载的作用良好；管道变形以垂直径向压缩为主，侵入荷载相同时，筋材层数越多，管道变形越小；钢板侵入体从管道正上方贯入时其两侧挤土效应显著，管道环向应变分布规律为管肩(30°~90°、270°~330°)受压，管顶(0°)和管底附近(135°~225°)受拉。
Abstract
A series of lab model tests were conducted for using geogrids to protect buried pipes of high-density polyethylene (HDPE) under mechanical intrusive load. Effects of reinforcement length (L),buried depth (u),spacing (s) and layer number (n) on reinforcement effect were comprehensively analyzed. The results showed that the effect of using geogrids to protect buried pipes is good,in contact initial stage between steel plate intrusion simulated as machinery and geogrids,the reinforcing effect is most prominent; when the buried depth is the same and the layer number of geogrid is 1,if increasing L from 3D to 4D or u from 0.5D to D (D being pipe’s outer diameter) and the steel plate intruding the same depth,the needed loads increase by 9.01% and 11.8%,respectively,so increasing reinforcement length or buried depth can effectively increase the difficulty of steel plate invasion; when reinforcement spacing is smaller,the resistance action of reinforcement against intrusive load is good; the deformation of buried pipes mainly is vertical radial compression,when intrusive load is the same,the more the layers of reinforcement,the smaller the deformation of the pipes; when the steel plate intrusion penetrates from straight above the pipe,the soil-squeezing effect on its both sides is remarkable,the distribution law of circumferential strain of buried pipes is pipe shoulders of 30°~90° and 270°~330° being pressed,and pipe top(0°) and bottom(135°~225°) being pulled.
关键词
埋地管道 /
土工格栅 /
模型试验 /
侵入荷载
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Key words
buried pipes /
geogrid /
model test /
intrusive load
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