本文選題：沉降柱 + 泥沙淤積��； 參考：《科學(xué)技術(shù)與工程》2017年07期

【摘要】：采用常規(guī)有機(jī)玻璃沉降柱試驗(yàn)系統(tǒng)針對泥砂淤積過程中淤積量以及強(qiáng)度的變化進(jìn)行了一系列的室內(nèi)實(shí)驗(yàn)。通過記錄濁液面高度隨時(shí)間變化得到不同濃度、不同級配泥砂的沉降曲線;并運(yùn)用SNJ-1型微型十字板剪切儀分層測取沉積淤泥的強(qiáng)度。對沉積泥砂在沉積過程中淤積量以及強(qiáng)度變化進(jìn)行分析,得到結(jié)論:泥沙淤積量隨泥沙濃度、時(shí)間的變大而變大;但沉積速率隨著泥沙的濃度的變大而減小。淤積泥沙的剪切強(qiáng)度隨著深度的增加、時(shí)間的延長、濃度的增加、粗顆粒含量的增加而增大;且泥沙濃度越大,強(qiáng)度隨時(shí)間增長的趨勢越不穩(wěn)定。根據(jù)實(shí)驗(yàn)數(shù)據(jù)擬合得到淤積泥沙強(qiáng)度與相對深度之間呈線性關(guān)系,并得出系數(shù)與時(shí)間之間也呈線性關(guān)系。
[Abstract]:A series of laboratory experiments were carried out on the change of silt quantity and strength during silting process by using the conventional test system of PMMA settling column.The sedimentation curves of different concentration and different gradation of mud sand were obtained by recording the change of liquid surface height with time, and the strength of sedimentary silt was measured by SNJ-1 mini cross plate shear meter.Based on the analysis of the change of sedimentation amount and strength of sediment sand in the process of sedimentation, it is concluded that the amount of sediment deposition increases with the increase of sediment concentration and time, but the deposition rate decreases with the increase of sediment concentration.The shear strength of silt increases with the increase of depth, time, concentration and coarse particle content, and the increasing of sediment concentration is more unstable.According to the experimental data fitting, the linear relationship between sediment intensity and relative depth is obtained, and the linear relationship between coefficient and time is also obtained.
【作者單位】： 河海大學(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室;河海大學(xué)江蘇省巖土工程技術(shù)研究中心;中冶北方(
【分類號(hào)】：TV149

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本文編號(hào)：1733937