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对软土地区盾构施工过程中曲线段因盾构超挖产生的空隙进行了理论计算,并对直线段与曲线段的同步注浆量进行了比较,结果表明:盾构在曲线段盾构推进过程中,因盾构超挖侧面的土体发生了坍塌与变形,在盾尾到达超挖间隙前已被周围坍塌与变形的土体所填充;在采用注浆压力进行同步注浆控制时,在曲线段并未因盾构超挖而导致实际注浆量明显增加。为了减小曲线段因超挖导致的地表沉降,在曲线段盾构推进时应适当加大同步注浆压力,建议以直线段同等注浆率对应的注浆量作为同步注浆控制标准。
In the process of shield tunnel construction in soft soil area, the gap caused by over excavation of shield was calculated theoretically, and the synchronous grouting amount of straight line segment and curved segment was compared. The results show that shield shield In the process of propulsion, due to the collapse and deformation of the overburdened soil on the side of the shield, it was filled by soil around which collapse and deformation occurred before reaching the overdosing clearance. When grouting pressure was used for synchronous grouting control In the curve section, the actual grouting volume did not increase obviously due to over excavation of the shield. In order to reduce the surface subsidence caused by over excavation in the curved section, the grouting pressure should be increased appropriately when the shield section of the curved section is advanced. It is suggested that the grouting amount corresponding to the same grouting rate should be taken as the synchronous grouting control standard.