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甘肃北部的腾格里沙漠南缘,沙层表面松散,厚度均超过50m。区域性断层较为发育,局部地段可能引起坍塌、边坡失稳等工程地质问题。施工中通过研究超厚粉砂地层桥梁深桩基(群桩)成孔施工若干关键技术问题,较好的解决了采用单一的车载式回旋钻或冲击钻,施工周期长,且易缩颈、塌孔,穿越复杂地层困难,桩基成孔难、成孔进尺缓慢等技术难题,以此供类似工程施工借鉴。
On the southern edge of the Tengger Desert in northern Gansu, the sand surface is loose with thicknesses of more than 50 m. Regional faults are more developed, and local sections may cause engineering geological problems such as collapse and slope instability. Through the study of several key technical problems in the construction of deep pile foundation (group pile) in super-thick silt stratum, it is a good solution to using a single on-board rotary drill or percussion drill, long construction period, Collapse holes, difficult formation through complex formations, difficulties in forming piles into holes, slow hole into the hole and other technical problems, so as to draw lessons from similar projects.