The construction technology of shield tunnelling under an operating railway in an adverse stratum is complex and risky. The existing research results mostly focus on the settlement control of the tunnel under the existing structure, but they are not adequate to provide a systematic reference for shield tunnelling under an operating railway with strict requirements on the settlement control. Based on the background of the Luoyang Rail Transit Line 2 shield passing through the Luoyi Railway, the comprehensive technology of grouting and suspension (CTGS) has been proposed, and field test and numerical simulation are used to study the effects of its application. The results show that the comprehensive technology of grouting and suspension has a significant effect on the rail settlement control of shield tunnelling under the operating railway in a cobble stratum. Using the grouting method to grout subgrade soil can improve the strength of the overlying soil layer. Using the suspension method to suspend the railway tracks can directly transfer the load to the pile foundation to avoid the subgrade bearing excessive load. CTGS combines the grouting method with the suspension method, which can be used as the preferred technology to control the influence of subgrade soil settlement on railway track surface. Compared with the similar technology, although the project cost is slightly higher, CTGS significantly ensures railway safety during the construction process, which can help keep the railway operation free from interference during the construction period and has obvious comprehensive benefits. CTGS has an important reference value for the safety control of shield tunnelling construction with the risky source under adverse geological conditions such as a sandy cobble stratum.

不利地层运营铁路盾构隧道施工技术复杂、风险大。现有的研究成果多集中在既有结构下隧道的沉降控制，但不足以为对沉降控制要求严格的运营铁路下盾构隧道施工提供系统参考。以洛阳轨道交通2号线盾构穿越洛义铁路为背景，提出了注浆悬吊综合技术（CTGS），并通过现场试验和数值模拟研究了其应用效果。结果表明，注浆与悬吊综合技术对鹅卵石地层运营铁路下盾构隧道的轨道沉降控制效果显着。采用注浆法对路基土进行注浆，可提高上覆土层的强度。采用悬吊法悬吊铁轨，可将荷载直接转移到桩基上，避免路基承受过大荷载。CTGS将注浆法与悬吊法相结合，可作为控制路基土沉降对铁路道面影响的首选技术。与同类技术相比，虽然工程造价略高，但CTGS在施工过程中显着保障了铁路安全，有助于铁路在施工期间不受干扰，综合效益明显。CTGS对于砂卵石地层等不利地质条件下有危险源的盾构隧道施工安全控制具有重要的参考价值。