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明挖浅埋湖底隧道重点防水施工技术研究 被引量:6
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作者 白由林 段小辉 李孝存 《中国建筑防水》 2016年第20期42-44,共3页
龙湖下穿隧道防水设防等级为一级,采用了单组分聚氨酯防水涂料和HDPE自粘胶膜防水卷材组合的复合防水体系,其上直接回填覆土。本文结合工程特点介绍了该隧道的防水构造和防水施工要点,并分析了施工缝、预埋钢筋和穿墙管处的防水施工工艺。
关键词 明挖隧道 水下防水 外防外贴法 细部节点 聚氨酯防水涂料 HDPE自粘胶膜防水卷材
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GROUNDWATER QUALITY AND CONTAMINATION INDEX MAPPING IN CHANGCHUN CITY,CHINA 被引量:16
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作者 Hamadoun BOKAR 《Chinese Geographical Science》 SCIE CSCD 2004年第1期63-70,共8页
Groundwater in Changchun City, Jilin Province of China tends to be influenced by human activities. Chemical types of groundwater were detected in both shallow and deep groundwater were: HCO3--Ca2+ and HCO3--Ca2+·... Groundwater in Changchun City, Jilin Province of China tends to be influenced by human activities. Chemical types of groundwater were detected in both shallow and deep groundwater were: HCO3--Ca2+ and HCO3--Ca2+·Mg2+ or HCO3--Mg2+·Ca2+; SO42--Ca2+ and SO42--Ca2+·Mg2+; Cl--Ca2+; and CO32--Na+. The deteriorations of groundwater quality due to the increase of TDS, NO3-+ NO2-(as Nitrogen) and TH contents have been observed from 1991 to 1998. Scatter analyses showed strong positive correlations between Ca2+, Cl-and NO3-ions and weak negative correlations between the depth of water table and Ca2+, SO42-, Cl-and NO3-ions. A mapping of contaminant index based on Chinese standard of groundwater showed that a large proportion of the groundwater in 1998 was deteriorated by human process. Despite their low values of sodium adsorption ratio (SAR), the most of the sampled wells were not suitable for drinking and agriculture purposes due to higher contents of NO3-, NO2-and Mn2+ ions. 展开更多
关键词 HYDROCHEMISTRY groundwater quality contaminant index linear regression analysis GIS mapping Changchun City
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Factors Influencing the Iterative Accuracy of Ground Water Level in Forecasting the Water Burst of Deep Drawdown Mines
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作者 李铎 杨小荟 +1 位作者 武强 张志忠 《Journal of China University of Mining and Technology》 2002年第1期81-85,共5页
The purpose of this paper is to discuss the influential factors of iteration accuracy when we use iteration to determine the numerical model for predicting water yield of deep drawdown mines and calculating the ground... The purpose of this paper is to discuss the influential factors of iteration accuracy when we use iteration to determine the numerical model for predicting water yield of deep drawdown mines and calculating the groundwater level. The relationship among the calculation error of groundwater level, the pumping rate, the limit of iteration convergence error, the calculation time, and the aquifer parameters were discussed by using an ideal model. Finally, the water yield of Dianzi iron mine was predicted using the testified numerical model. It is indicated that the calculation error of groundwater level is related to the limit of iteration convergence error, the calculation time and the aquifer parameters, but not to the pumping rate and the variation of groundwater level. 展开更多
关键词 deep drawdown water yield groundwater level ITERATION error limit
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