北京地铁10号线二期起点至潘家园区间富水粉细砂层中有长289m的矿山法隧道侧穿劲松折返线,动态化注浆中采用“止水超前、成环加固、勤加量测、及时补浆”的基本思路,并根据监测检测情况动态调整施工参数.经改良的地层渗透系数相当于粘性土层,土体强度达到0.54MPa,既有线隧道变形指标均在允许范围内,未发生监测及巡视预警.%The 289m mining tunnel of Beijing Subway Line l0 Phase Ⅱ in rich-water powder find sand stratum laterally passes through the turn line of Jinsong Station between the starting station and Panjiayuan Station.Permeability coefficient of modified stratum is equivalent to cohesive soil stratum and the soil strengthen reaches 0.54MPa.The tunnel deformation indices of existing subway line are allowable and no monitoring and patrol warning happened.
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