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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 class="tbege"><div class="tbege">上一?<a href="37.html">管施工工程中,常见的土质有哪些</a></div> <div class="tbege">下一?<a href="35.html">道管施工旉要注意什?/a></div> </ul> </div> <div class="info_key">相关标签Q?a href='/key.aspx?k=%b6%a5%b9%dc%ca%a9%b9%a4'>管施工</a>,</div> </div> <div class="clear"></div> <div class="cateslist"> <dl> <dt>相关产品</dt> <dd> <div class="img"> <a href="/supply/21.html" title="抚州管施工工程" rel="nofollow"><img src="//cmsimgshow.zhuchao.cc/32920/201808300909263053292091118.jpg?path=www.fzmtdg.com/uploads/cp/201808300909263053292091118.jpg" title="抚州管施工工程" alt="抚州管施工工程"/></a> </div> <div class="txt"> <a href="/supply/21.html" title="抚州管施工工程" rel="nofollow">抚州管施工工程</a> </div> </dd> <dd> <div class="img"> <a href="/supply/20.html" title="施工工程" rel="nofollow"><img src="//cmsimgshow.zhuchao.cc/32920/201808300905578673292065230.jpg?path=www.fzmtdg.com/uploads/cp/201808300905578673292065230.jpg" 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