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江西省抚州市高新技术业开发东大?688P荟萃中央Q?4q?402?/p> </dd> </dl> </div> </div> </div> <div class="main_right"> <div class="sitemap"><a href="/">首页</a> > <a href="/news/gsxw/">公司新闻</a> > 详细内容</div> <div class="content"> <div class="news_xaingxi"><h1>管施工引v的地面变形分?/h1></div> <div class="news_author"> 来源Q?a href='http://www.gmyqpr.live/news/36.html'>http://www.gmyqpr.live/news/36.html</a>   发布旉Q?018-08-18 </div> <div class="news_content"> <p><p> <span style="font-family:Microsoft YaHei;font-size:16px;"> <b><a href="http://www.gmyqpr.live/" target="_blank" style="font-weight:bold">管施工</a></b>q程中生地面变形的Ҏ原因?b><a href="http://www.gmyqpr.live/supply/3.html" target="_blank">管</a>施工</b>对周围土体的扰动Q地面变形由一下五个部分组?</span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    (1)掘进机到辑։的地面变?/span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    当掘q机L点较q时Q由于刀盘的切削搅拌、振动,会对土体产生扰动。土体颗_之间存在孔?孔隙中含有水和空?Q在扰动作用下,孔隙中的水和气体被排出,土体颗粒相对UdQ土体生一定的压羃Q地面会出现微小的沉降?/span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    (2)掘进机到达时的地面变?/span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    当掘q机距离很近Ӟ位于掘进机正前方的土体,受到千斤推力的挤压、刀盘的切削剪切力以及振动荷载的作用Q应力状态十分复杂?/span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    (3)掘进机通过时的地面变Ş</span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    当掘q机通过Ӟ掘进机外壳与土层间会形成剪切滑动面,剪切滑动面附q的土层内生剪切应力,剪切应力引v地面变Ş。推q速度快Q剪切应力越大,周围土体位移也越大?/span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    (4)掘进机通过后的地面变Ş</span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    为减摩擦阻力,后箋节的直径比掘进机的直径要小2-5cm。所以,当掘q机N通过后,道周围的土体要向管壁移动,以填补后l管节外围的间隙Q这样就会引起土体移动。ؓ保持土层E_及减摩dQ施工过E中必须在管节外周注,q保持适当的注压力。因此,q部分土层位UM间隙的大、注压力、注方法等因素有关?/span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    Q?)受扰动土体再固结引v的地面变?/span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;"> </span><br /> <span style="font-family:Microsoft YaHei;font-size:16px;">    管道周围土体受施工扰动后Q将形成静孔隙水压力区。在掘进机离开该区后,孔隙水压力下降Q孔隙水消散Q土体发生固l作用,引v地面沉降。这部分Z固结沉降Q随后,土体仍会产生蠕变Q发生次固结沉降?/span> </p> <p align="center"> <span style="font-family:Microsoft YaHei;font-size:16px;"><img alt="" src="/uploads/image/20180818/20180818143713_9687.jpg" /></span> </p></p> </div> <div class="pagess"> <ul><div>上一?<a href="37.html">管施工工程中,常见的土质有哪些</a></div> 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