%0 Journal Article
%T 土工格栅防护埋地HDPE管道的变形与力学性能<br>Deformation and Mechanical Performance of Buried HDPE Pipes Reinforced by Geogrids
%A 肖成志
%A 王嘉勇
%A 杨亚欣
%A 周霞&lt
%A br&gt
%A XIAO Chengzhi
%A WANG Jiayong
%A YANG Yaxin
%A ZHOU Xia
%J 西南交通大学学报
%D 2017
%R 10.3969/j.issn.0258-2724.2017.01.006
%X 为了深入分析土工格栅加筋防护对埋地管道的减载性能，采用埋地管道上方地表加载板静载试验，综合对比研究了筋材首层埋深、铺设长度与层数及管周土性质和管道埋深等因素对管道变形和力学性能的影响.研究结果表明：当筋材长度由0增至4D（D为管道外径）、管周土密实度由45%增至75%、加筋层数由0增至3~4层时，管道上方加载板极限承载力相应地分别增加1.40倍、1.60倍和2.52倍；管道以环向应变为主，应变范围在-1.0%~0.5%之间；相同条件下管道垂直径向变形大于水平径向变形，且当筋材首层埋深为0.4B（B为加载板宽）、筋材长度为4D和筋材层数为3~4时，土工格栅加筋减载防护性能最佳.<br>： To analyze load reduction performance of buried pipes reinforced by geogrids, the influence of embedment depth of the uppermost geogrid, length of geogrid, geogrid layers, sand surrounding buried pipes and buried depth of pipes on the deformation and mechanism of pipes was studied through static loading plate tests. The results show that when the length of geogrids changes from 0 to 4D (D denotes the external diameter of pipes), relative density of sand varies from 45% to 75% and reinforcement layers change from 0 to 3 or 4, the ultimate bearing capacities of load plate are respectively 1.4, 1.6 and 2.52 times the one without reinforcement. Moreover, the hoop strain plays a dominant role in buried pipes, ranging from -1.0% to 0.5%. Deformation in vertical direction is greater than that in horizontal direction. The optimal load reduction performance of pipes reinforced by geogrids was obtained when the embedment depth of the uppermost geogrid is 0.4B (B is width of loading plate), geogrid length is 4D, and geogrid layers is 3-4
%K 土工合成材料
%K 土工格栅
%K 埋地管道
%K 防护性能
%K 静载
%K &lt
%K br&gt
%K geosynthetics
%K geogrids
%K buried pipes
%K protection performance
%K static load
%U http://manu19.magtech.com.cn/Jweb_xnjd/CN/abstract/abstract12372.shtml