黄河泥沙充填复垦中土工布排水拦沙效果的模拟试验

为验证土工布用于加速引黄河泥沙充填采煤沉陷地的后期侧向排水及降低排水中泥沙含量的效果,在室内进行了基于土工布的泥沙充填排水模拟试验。该试验在玻璃槽内完成,设计3个试验处理,分别为ZT-250（整个断面开口＋铁丝网＋ZW-250土工布）、ZT-300（整个断面开口＋铁丝网＋ZW-300土工布）以及CK（断面中间部分开口＋可调节高度的塑料板）。测定了3个处理的排水含沙量及泥沙粒径、玻璃槽内表层泥沙粒径以及充填表层和底层泥沙含水率随时间的变化。结果表明：1）3种处理排水含沙量整体差异较小,但使用土工布处理的排水含沙量随时间的延长逐渐降低,而对照处理排水含沙量随时间的延长逐渐增大;2）排水初期和中期,...

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Published in农业工程学报 Vol. 31; no. 17; pp. 72 - 80
Main Author 王培俊 邵芳 刘俊廷 李星宇 胡振琪 Russell S.Yost
Format Journal Article
LanguageChinese
Published Department of Tropical Plant and Soil Sciences, University of Hawai'i at Mānoa, Honolulu 96822, Hawaii, USA%中国矿业大学(北京)土地复垦与生态重建研究所,北京,100083%Department of Tropical Plant and Soil Sciences, University of Hawai'i at Mānoa, Honolulu 96822, Hawaii, USA 2015
中国矿业大学(北京)土地复垦与生态重建研究所,北京100083
Subjects
含水率
土地复垦
土工布
排水
泥沙
粒径
采煤沉陷地
黄河
土地复垦
排水
土工布
Yellow River
geotextiles
grain size
mining subsidence land
land reclamation
含水率
water content
泥沙
drainage
采煤沉陷地
黄河
粒径
sediments
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2015.17.010

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Summary:为验证土工布用于加速引黄河泥沙充填采煤沉陷地的后期侧向排水及降低排水中泥沙含量的效果,在室内进行了基于土工布的泥沙充填排水模拟试验。该试验在玻璃槽内完成,设计3个试验处理,分别为ZT-250（整个断面开口＋铁丝网＋ZW-250土工布）、ZT-300（整个断面开口＋铁丝网＋ZW-300土工布）以及CK（断面中间部分开口＋可调节高度的塑料板）。测定了3个处理的排水含沙量及泥沙粒径、玻璃槽内表层泥沙粒径以及充填表层和底层泥沙含水率随时间的变化。结果表明：1）3种处理排水含沙量整体差异较小,但使用土工布处理的排水含沙量随时间的延长逐渐降低,而对照处理排水含沙量随时间的延长逐渐增大;2）排水初期和中期,对照CK的排水中泥沙的黏粒含量均高于使用土工布的2个处理。排水后期CK的黏粒含量介于处理ZT-250和ZT-300之间。随着试验的进行,使用土工布的2个处理排水中泥沙的黏粒含量逐渐升高,粉粒含量逐渐降低,而对照处理呈现相反的变化趋势。使用土工布的2个处理拦沙效果较为稳定。3）3种处理充填表层泥沙粒径级配无明显差异,但使用土工布处理充填的表层泥沙的极细砂粒含量较高。4）3种处理充填泥沙表层和底层含水率变化存在差异,使用土工布可以加速泥沙中过饱和水的排除,其中处理ZT-250排水效果最好。该研究可为中国东部高潜水位平原矿区采煤沉陷地引黄河泥沙充填复垦的快速排水工艺革新提供依据。
Bibliography:Yellow River sediments have been used as filler for land reclamation in mining subsidence land nearby Yellow River. During the reclamation, water is often drained directly and rapidly from outlet excavated in the center of the cofferdam, leading to fine sediments（clay and most of silt） lost with drainage and deposited in ditch, poor lateral drainage of saturated sediments, low drainage efficiency by only vertical infiltration in reclamation strip. In this study, we tested the feasibility of geotextiles used in the Yellow River sediments to increase the lateral drainage velocity and reduce the sediment loss in drainage in a laboratory experiment. The Yellow River sediments were filed in glass tanks to simulate the land reclamation process. Two kinds of geotextiles including 250（ZW-250） and 300 g（ZW-300） a piece were selected. In the treatments with geotextiles, the whole cross section was opened for drainage. A control without geotextile（CK） was designed with narrow outlet in the center of the cross section fo
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2015.17.010