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防沖槽一般為堆石結構，槽頂與海漫頂面齊平，槽底高程取決于沖刷深度、開挖施工和堆石數量等條件。傳統防沖槽與河床基土之間沒有設置過渡層，堆石直接落在河床基土上，河床基土容易發生沖刷破壞，砂走石沉，經常需要對防沖槽補拋石，否則會影響到海漫的安全。在防沖槽堆石結構與河床基土之間鋪設土工布，可有效保護基土免于沖刷破壞。 </p> <p> </p> <p> 沿流溪河堤防設置不少水閘以保證高水位時不倒灌入支流，水閘出口處土質多為粉細砂及粉土，容易發生沖刷破壞，原設計時消力池下游海漫部分僅有拋石，汛期幾場大雨后，拋石很快被沖走，河床基土也被沖走，影響水閘安全。后來設計在海漫及防沖槽底部均先鋪設一層無紡土工布，在土工布上鋪碎石后再放石籠。經此改建后，水閘出口段再也沒有產生大的沖刷變形。對于需要護底的河段和水流沖刷較嚴重的堤前護腳，同樣可在防護結構與基土之間設置土工布對基土進行防護。但對于常用的拋石施工，應研究拋石對土工布的破壞影響，并在設計時加以考慮。允許承載力40kPa，壓縮系數大于0．5/MPa。該工程臨近珠江出?？?，圍堰抗風浪沖刷的要求高。 </p></div> <script> window._bd_share_config = { common : { bdText : '<p> 水閘下游的消能防沖設計是水閘設計的主要內容。經過消力池后的水流底部流速仍然較大，紊動激烈，一般需要設置海漫護底，以免引起嚴重沖刷。如果要求河床完全沒有沖刷，海漫必須做得很長，既不經濟也沒有必要，為此，常接著海漫設置一道防沖槽。 </p> <p align="center"> </p> <p align="center"> <img onload="resize(this,700)" alt="土工布鋪碎石放石籠水閘再無沖刷變形" src="/upload/image/20210422/20210422144647_89741.jpg" /> </p> <p> </p> <p> 土工布鋪碎石放石籠水閘再無沖刷變形 </p> <p> </p> <p> 防沖槽一般為堆石結構，槽頂與海漫頂面齊平，槽底高程取決于沖刷深度、開挖施工和堆石數量等條件。傳統防沖槽與河床基土之間沒有設置過渡層，堆石直接落在河床基土上，河床基土容易發生沖刷破壞，砂走石沉，經常需要對防沖槽補拋石，否則會影響到海漫的安全。在防沖槽堆石結構與河床基土之間鋪設土工布，可有效保護基土免于沖刷破壞。 </p> <p> </p> <p> 沿流溪河堤防設置不少水閘以保證高水位時不倒灌入支流，水閘出口處土質多為粉細砂及粉土，容易發生沖刷破壞，原設計時消力池下游海漫部分僅有拋石，汛期幾場大雨后，拋石很快被沖走，河床基土也被沖走，影響水閘安全。后來設計在海漫及防沖槽底部均先鋪設一層無紡土工布，在土工布上鋪碎石后再放石籠。經此改建后，水閘出口段再也沒有產生大的沖刷變形。對于需要護底的河段和水流沖刷較嚴重的堤前護腳，同樣可在防護結構與基土之間設置土工布對基土進行防護。但對于常用的拋石施工，應研究拋石對土工布的破壞影響，并在設計時加以考慮。允許承載力40kPa，壓縮系數大于0．5/MPa。該工程臨近珠江出?？?，圍堰抗風浪沖刷的要求高。 </p>', bdDesc : '<p>...', bdUrl : 'http://www.dingyajx.com/news_show.php?theid=1478', 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=1479">HDPE復合土工膜施工的順利實施需要一批專業技能扎實的工人</a><br /> 下一篇：<a href="news_show.php?theid=1477">全面提高高密度聚乙烯復合土工膜的防滲性能</a><br /> <a 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