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.theother h1,h2,h3,h4{font-weight:normal;font-size:12px;display:inline;} </style> <span style="float:right;"> <a href="http://www.meesuksilver.com/"><h4>土工膜</h4></a>,<a href="http://www.meesuksilver.com/"><h4>防滲膜</h4></a>,<a href="http://www.meesuksilver.com/"><h4>土工膜廠家</h4></a>,<a href="http://www.meesuksilver.com/"><h4>土工膜價格</h4></a> 時間：2019-02-27 網址：<a href="http://www.meesuksilver.com/">http://www.meesuksilver.com/</a> 分享： </span> </div> <div class="thecontent"><p> 土工膜是一種柔性薄膜材料，具有抗滲性好、變形適應性強、施工速度快、造價低等優點，已廣泛應用于土石壩、路堤、圍堰、渠道等各類抗滲工程中。土石壩土工膜的防滲結構有兩種形式:一種是設置在壩面上作為防滲面板，另一種嵌在壩體中部作為防滲心墻。對于壩體表面的防滲土工膜，存在幾種可能的穩定性問題:土工膜以及土工膜后大壩的穩定性、沿墊面土工膜和沿土工膜表面保護層。由于土工膜是柔性材料，在壩面設置土工膜不會增加壩體邊坡的穩定性。后兩種穩定性與土工膜保護層和墊層的性質及儲集層的運行條件密切相關。 </p> <p> <br /> </p> <p> 土工膜似乎不透水，但在一定的壓力和實際工作條件下，可能會有滲透和/或滲漏。分析了不同拉伸狀態下土工膜的微觀結構，發現土工膜表面存在微米級的細小顆粒，顆粒之間形成了潛在的超微“孔”。在一定的水壓下，直徑約為4×10-4 m的水分子可以在土工膜聚合物大分子鏈、結晶區和非晶區中擴散、滲透和通過超微“孔”，形成微量的可滲透水。當土工膜承受更多的水壓時，力就會擴展土工膜中超微孔隙區域的發育，水壓逐漸打開一些潛在的微孔隙通道，增加滲透性。膜后壩體孔隙水壓力可測得，說明土工膜具有滲透性和滲流性。 </p> <p> <br /> </p> <p> 土工膜在產品質量、設計、施工、運行等環節中，可能產生各種宏觀缺陷，導致缺陷的滲漏。除了缺陷的形狀、數量和大小外，缺陷的泄漏也與土工膜底層的特性密切相關。滲流增加了壩體的滲流，明顯抬高了土工膜缺陷附近壩體的滲流線。此時，如果不能及時排出滲透水和滲漏水，特別是在水庫水位下降等特殊工況下，就會發生土工膜頂升現象，從而導致壩面土工膜局部防滑穩定。 </p> <p> </p> <p align="center"> <img onload="resize(this,700)" alt="土工膜是一類柔性薄膜材料" src="/upload/image/20190227/20190227085758_12227.jpg" /> </p> <p> </p></div> <script> window._bd_share_config = { common : { bdText : '<p> 土工膜是一種柔性薄膜材料，具有抗滲性好、變形適應性強、施工速度快、造價低等優點，已廣泛應用于土石壩、路堤、圍堰、渠道等各類抗滲工程中。土石壩土工膜的防滲結構有兩種形式:一種是設置在壩面上作為防滲面板，另一種嵌在壩體中部作為防滲心墻。對于壩體表面的防滲土工膜，存在幾種可能的穩定性問題:土工膜以及土工膜后大壩的穩定性、沿墊面土工膜和沿土工膜表面保護層。由于土工膜是柔性材料，在壩面設置土工膜不會增加壩體邊坡的穩定性。后兩種穩定性與土工膜保護層和墊層的性質及儲集層的運行條件密切相關。 </p> <p> <br /> </p> <p> 土工膜似乎不透水，但在一定的壓力和實際工作條件下，可能會有滲透和/或滲漏。分析了不同拉伸狀態下土工膜的微觀結構，發現土工膜表面存在微米級的細小顆粒，顆粒之間形成了潛在的超微“孔”。在一定的水壓下，直徑約為4×10-4 m的水分子可以在土工膜聚合物大分子鏈、結晶區和非晶區中擴散、滲透和通過超微“孔”，形成微量的可滲透水。當土工膜承受更多的水壓時，力就會擴展土工膜中超微孔隙區域的發育，水壓逐漸打開一些潛在的微孔隙通道，增加滲透性。膜后壩體孔隙水壓力可測得，說明土工膜具有滲透性和滲流性。 </p> <p> <br /> </p> <p> 土工膜在產品質量、設計、施工、運行等環節中，可能產生各種宏觀缺陷，導致缺陷的滲漏。除了缺陷的形狀、數量和大小外，缺陷的泄漏也與土工膜底層的特性密切相關。滲流增加了壩體的滲流，明顯抬高了土工膜缺陷附近壩體的滲流線。此時，如果不能及時排出滲透水和滲漏水，特別是在水庫水位下降等特殊工況下，就會發生土工膜頂升現象，從而導致壩面土工膜局部防滑穩定。 </p> <p> </p> <p align="center"> <img onload="resize(this,700)" alt="土工膜是一類柔性薄膜材料" src="/upload/image/20190227/20190227085758_12227.jpg" /> </p> <p> </p>', bdDesc : '<p>...', bdUrl : 'http://www.dingyajx.com/news_show.php?theid=687', bdPic : '' }, share : [{ "bdSize" : 16 }] } with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?cdnversion='+~(-new Date()/36e5)]; </script> <div class="thepageinfo"> 上一篇：<a href="news_show.php?theid=688">復合土工膜的鋪設應符合施工圖紙的要求</a><br /> 下一篇：<a href="news_show.php?theid=686">土工膜與壩體之間的抗滑穩定性需單獨復核計算</a><br /> <a href="news_list.php?tag=news&theid=17">返回列表</a><br /> </div> </div> </div> </div> </div> </div> <script> (function(){ var bp = document.createElement('script'); var curProtocol = 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