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時間：2019-05-21 網址：<a href="http://www.majubuanatravel.com/">http://www.majubuanatravel.com/</a> 分享： </span> </div> <div class="thecontent"><p> 當水壓較低時，滲透系數隨水壓的增大而增大。這是因為不斷增大的水壓會使土工路基中潛在的微觀“孔隙”或“裂縫”通道不斷被水擊穿，從而增加入滲通道，增加水流。當膜上的水壓力較大時，滲透系數隨壓力的增大而減小。這是因為較大的水壓壓縮了土工膜的厚度，土工膜在平面上膨脹，使得原先打開的滲透通道不斷關閉或堵塞，滲透系數降低，滲透系數也逐漸減小。因此，土工膜應具有一定壓力下的滲透系數。 </p> <p align="center"> <img onload="resize(this,700)" alt="土工膜應該存在某一特定壓力下的滲透系數" src="/upload/image/20190521/20190521120016_26026.jpg" /> </p> <p> </p> <p> 光滑土工膜防滲巖壩的滲流分析方法 </p> <p> <br /> </p> <p> 性能良好的土工膜滲透系數為10-11 ~ 10-13cm/s，小于10-7 ~ 10-9cm/s的混凝土滲透系數。摘要由于土工織物厚度較小，用常規有限元法對土工織物壩進行劃分計算時，難以模擬厚度僅為毫米的土工織物壩的滲流行為。土工膜通常被放大成具有一定厚度的等效多孔介質。土工膜厚度增加n倍，法向滲透系數增加n倍，膜面滲透系數減小1/n倍。 </p> <p> 光滑土工膜防滲巖壩的滲流分析方法 </p> <p> <br /> </p> <p> 根據這種方法,比較和計算結果表明,等效的浸潤線只是明顯不同geo -膜厚度在不同地理區膜厚放大倍數,和壩體的位置在geo -電影基本上仍然是不變的。雖然滲流隨土工膜厚度放大系數的增大而略有減小，但在相同的數量級內略有變化，說明按照流量等效原理對土工膜進行放大處理是可行的。計算還表明，路堤線高度主要由路堤后土體和巖石的滲透性決定，不受路堤滲透性的影響。 </p></div> <script> window._bd_share_config = { common : { bdText : '<p> 當水壓較低時，滲透系數隨水壓的增大而增大。這是因為不斷增大的水壓會使土工路基中潛在的微觀“孔隙”或“裂縫”通道不斷被水擊穿，從而增加入滲通道，增加水流。當膜上的水壓力較大時，滲透系數隨壓力的增大而減小。這是因為較大的水壓壓縮了土工膜的厚度，土工膜在平面上膨脹，使得原先打開的滲透通道不斷關閉或堵塞，滲透系數降低，滲透系數也逐漸減小。因此，土工膜應具有一定壓力下的滲透系數。 </p> <p align="center"> <img onload="resize(this,700)" alt="土工膜應該存在某一特定壓力下的滲透系數" src="/upload/image/20190521/20190521120016_26026.jpg" /> </p> <p> </p> <p> 光滑土工膜防滲巖壩的滲流分析方法 </p> <p> <br /> </p> <p> 性能良好的土工膜滲透系數為10-11 ~ 10-13cm/s，小于10-7 ~ 10-9cm/s的混凝土滲透系數。摘要由于土工織物厚度較小，用常規有限元法對土工織物壩進行劃分計算時，難以模擬厚度僅為毫米的土工織物壩的滲流行為。土工膜通常被放大成具有一定厚度的等效多孔介質。土工膜厚度增加n倍，法向滲透系數增加n倍，膜面滲透系數減小1/n倍。 </p> <p> 光滑土工膜防滲巖壩的滲流分析方法 </p> <p> <br /> </p> <p> 根據這種方法,比較和計算結果表明,等效的浸潤線只是明顯不同geo -膜厚度在不同地理區膜厚放大倍數,和壩體的位置在geo -電影基本上仍然是不變的。雖然滲流隨土工膜厚度放大系數的增大而略有減小，但在相同的數量級內略有變化，說明按照流量等效原理對土工膜進行放大處理是可行的。計算還表明，路堤線高度主要由路堤后土體和巖石的滲透性決定，不受路堤滲透性的影響。 </p>', bdDesc : '<p>...', bdUrl : 'http://www.dingyajx.com/news_show.php?theid=839', bdPic : '' }, share : [{ "bdSize" : 16 }] } 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