Analysis and Treatment of Subgrade Settlement in a Certain Section of the Yechi Railway
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摘要: 叶赤铁路某路段路基出现下沉病害，通过现场地质勘察分析，发现煤层的开采改变了周围地层应力平衡状态，使得断层破碎带沿F1断层向下发生塑性变形，加之第四系地层随断层发生流砂，最终导致地面产生沉降变形。根据工程情况，采用第四系地层注浆及断层带注浆的治理方案，改善了铁路路基第四系地层的力学性质，提高了破碎带的抗塑性变形能力。该方案充分利用袖阀管注浆定向定量定尺及可重复性的特点，取得了显著的治理效果，可为类似工程提供参考。Abstract: A certain section of the Yechi Railway was affected by subgrade settlement disease. Through on-site geological investigation and analysis, it was found that the mining of coal seams changed the stress balance state of the surrounding strata, causing plastic deformation of the fault fracture zone along the F1 fault downwards, in addition, the Quaternary strata experienced drift sand along the fault, ultimately leading to subsidence and deformation of the ground. Based on the engineering situation, the treatment scheme of grouting in the Quaternary strata and grouting in fault zones was adopted to improve the mechanical properties of the Quaternary strata in the railway roadbed and enhance the plastic deformation resistance of the fractured zone. The characteristics of directional quantitative sizing and repeatability of sleeve valve pipe grouting were reflected by this plan. This scheme can provide a reference for similar projects.
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Key words:
- subgrade settlement /
- mine goaf /
- fault /
- sleeve valve pipe /
- grouting
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