粉细砂地层盾构施工控制参数研究
Research on Control Parameters of Shield Construction in Silty Sand Stratum

目前我国在应用泥水平衡盾构穿越饱和黏土土层的越江隧道施工技术日渐成熟，但对盾构在细砂土层中长距离下穿河流的研究较少，施工中关键性难题有待解决。本文依靠华电灵武电厂向银川市智能化供热项目，对盾构隧道穿越黄河粉细砂地层工程开展研究。通过对掘进过程中的推力、掘进速度、刀盘转速、刀盘扭矩、平均土仓压力等掘进参数和现场监测数据的统计，分析各个参数的变化规律以及掘进过程中各参数对地表沉降变形的影响。
At present, the construction technology of cross-river tunnels in which mud-water balance shields are used to penetrate saturated clay soil layers is becoming mature, but there are few studies on shields passing through rivers in long distances in fine sand-layers. The key problems in construction need to be resolved. This paper relies on the Huadian Lingwu Power Plant's intelligent heating project to Yinchuan City to conduct research on the shield tunnel crossing the Yellow River silty sand formation. Through the statistics of driving parameters such as thrust, driving speed, cutter head speed, cutter head torque, average soil bin pressure and other field monitoring data during the excavation process, the variation rules of each parameter and the settlement of the parameters to the surface settlement during the excavation process are analyzed influences.