固结黏性土河床冲刷深度试验研究
TV147; 固结黏性土是沉积日久、经过物理化学作用、已经形成黏土矿物的黏性土,其起动特性与散粒体泥沙存在明显差异,河床冲刷情况也更为复杂.以拟建绍兴市城市轨道交通2号线下穿曹娥江隧道工程河段为例,采用水槽试验与河工模型试验相结合的方法,通过水槽试验测量原状土与模型沙起动流速及输沙率,从而选取模型沙并确定冲淤时间比尺.结果表明:在百年一遇与三百年一遇极端洪水作用下,隧道线位上游受弯道的影响,下游受左岸边滩的约束,冲刷深度均较大,而隧道线位处冲刷幅度相对较小,最大冲刷深度分别为5.5 m、7.7 m.水槽试验与河工模型试验相结合的方法可为固结黏性土河床的隧道、管道埋深设计提供参考....
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| Published in | 中国农村水利水电 no. 8; pp. 169 - 179 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国电建集团华东勘测设计研究院有限公司,浙江 杭州 311122%南京水利科学研究院 港口航道泥沙工程交通行业重点实验室,江苏 南京 210029%长江航道局,湖北 武汉 430010%长江设计集团有限公司,湖北 武汉 430014
15.08.2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1007-2284 |
| DOI | 10.12396/znsd.232016 |
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| Abstract | TV147; 固结黏性土是沉积日久、经过物理化学作用、已经形成黏土矿物的黏性土,其起动特性与散粒体泥沙存在明显差异,河床冲刷情况也更为复杂.以拟建绍兴市城市轨道交通2号线下穿曹娥江隧道工程河段为例,采用水槽试验与河工模型试验相结合的方法,通过水槽试验测量原状土与模型沙起动流速及输沙率,从而选取模型沙并确定冲淤时间比尺.结果表明:在百年一遇与三百年一遇极端洪水作用下,隧道线位上游受弯道的影响,下游受左岸边滩的约束,冲刷深度均较大,而隧道线位处冲刷幅度相对较小,最大冲刷深度分别为5.5 m、7.7 m.水槽试验与河工模型试验相结合的方法可为固结黏性土河床的隧道、管道埋深设计提供参考. |
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| AbstractList | TV147; 固结黏性土是沉积日久、经过物理化学作用、已经形成黏土矿物的黏性土,其起动特性与散粒体泥沙存在明显差异,河床冲刷情况也更为复杂.以拟建绍兴市城市轨道交通2号线下穿曹娥江隧道工程河段为例,采用水槽试验与河工模型试验相结合的方法,通过水槽试验测量原状土与模型沙起动流速及输沙率,从而选取模型沙并确定冲淤时间比尺.结果表明:在百年一遇与三百年一遇极端洪水作用下,隧道线位上游受弯道的影响,下游受左岸边滩的约束,冲刷深度均较大,而隧道线位处冲刷幅度相对较小,最大冲刷深度分别为5.5 m、7.7 m.水槽试验与河工模型试验相结合的方法可为固结黏性土河床的隧道、管道埋深设计提供参考. |
| Abstract_FL | Consolidated cohesive soil is a kind of cohesive soil that has been deposited for a long time and formed clay minerals through physi-cal and chemical reactions.Its starting characteristics are significantly different from those of the new silted cohesive soil,and the riverbed scouring situation is also more complicated.Taking the section of Shaoxing Urban Rail Transit Line 2 underneath the Cao'e River Tunnel Project as an example,the method of combining flume test with river model test is adopted.The incipient velocity and sediment transport rate of undisturbed soil and model sand are measured by flume test,so as to select model sand and determine the scale of erosion and deposition time.On this basis,the river model test is used to study the riverbed erosion situation.The similarity of water flow structure and cross-sec-tion terrain erosion and deposition are verified by the measured flood and topographic data,which means that the method can accurately re-flect the flow and sendiment movement phenomenon of natural river channel and the method of combining flume test with river model test can be used to predict the maximum scour depth of consolidated cohesive soil riverbed.Using this method,the maximum scour depth of the engi-neering river section under the action of extreme floods with a return period of one hundred years and three hundred years is studied.The re-sults show that the upstream of the tunnel line is affected by the bend and the downstream is constrained by the left bank beach,and their scouring depth is large,while the scouring amplitude at the tunnel line is relatively small,with the maximum scouring depths of 5.5 m and 7.7 m under the action of extreme floods of once-in-a-hundred years and once-in-three-hundred-years,respectively.This method can pro-vide reference for the design of tunnel and pipeline buried depth in consolidated cohesive soil riverbed. |
| Author | 杨奇霖 赵建锋 张新周 钱俊 伍文俊 许慧 |
| AuthorAffiliation | 中国电建集团华东勘测设计研究院有限公司,浙江 杭州 311122%南京水利科学研究院 港口航道泥沙工程交通行业重点实验室,江苏 南京 210029%长江航道局,湖北 武汉 430010%长江设计集团有限公司,湖北 武汉 430014 |
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| Author_FL | YANG Qi-lin QIAN Jun ZHAO Jian-feng WU Wen-jun XU Hui ZHANG Xin-zhou |
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| DocumentTitle_FL | Experimental Study on Scour Depth of Consolidated Cohesive Soil Riverbed |
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| Keywords | 河工模型试验 consolidated cohesive soil 固结黏性土 河床冲刷深度 riverbed scour depth flume test 水槽试验 river model test |
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| Title | 固结黏性土河床冲刷深度试验研究 |
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