浅埋回填土质高速铁路隧道控制变形技术研究

近年来,我国的交通事业得到了飞速的发展,在高速铁路建设中,经常会出现穿越回填段的情况。土质隧道变形问题均没有列入隧道设计施工规范,设计图中往往因支护参数偏低,施工中常常因对隧道沉降变形疏忽,经常造成衬砌厚度不足,严重的造成塌方,需返工处理,加重工期压力,另外造成大量的成本流失。在本文中,将就浅埋回填土质高速铁路隧道控制变形技术进行一定的研究,并提出预防浅埋回填土质铁路隧道施工变形和地表沉降的工法和相应的技术措施,最后通过工程案例验证该工法的实效性,以期为同类工程提供有参考价值的技术资料。

土质地层中的隧洞开挖法施工

通过石台县秋浦河大桥过路涵洞的施工，介绍了在回填土质堤坝中采用隧洞开挖法开挖涵洞的施工方案和施工技术，该方案与其它方案相比工艺简单、费用低、速度快。

简述土方回填施工技术措施

本工艺标准适用于工业及民用建筑物、构筑物大面积平整场地,大型基坑、管沟和房心土等的人工回填土施工。

深基坑支护方案设计与施工技术

本工程基坑开挖深度4.65m,最大开挖深度6.5m,对于回填土质的深基坑支护,本工程根据工程的具体情况采用了放坡加土钉墙及局部注浆的围护方案。

Quality evaluation of layerlike backfilling and flow pattern of backfill slurry in stope

Stability condition and quality evaluation formula of layerlike backfilling roof,Q≥C,where Q denotes is quality index depending on allowable compressive or tensile strength and integrity of backfilling,and C is the technical index depending on mining method and backfilling technology,were inferred according to simply supported beam theorem.Technical treatment measures for instable backfilling roof,including optimum of appropriate filling materials and dosage for excellent flow property and reduction of backfill cost.It is proved that slope equation of backfill slurry in a stope to be filled is y=hexp[x2/(2σ)2)],where h is height of cone and σ2 is mean square,and that optimum drainage point of backfill slurry can be determined by the equation and sizes of stope.Case study indicates that the results can give a theoretical support for quality evaluation and control of layerlike backfilling.