盾构施工引起土体位移的空间计算方法

3-D Analytical Method Used to Calculate Shield Tunneling Induced Soil Displacem ents

城市地下隧道的修建会引起隧道周围一定范围土体的位移,对土体位移进行较准确的计算对于控制隧道周围土体位移量和减小过大位移对已有建筑物及管线带来的危害十分重要.隧道周围土体的位移是由地层损失引起的,并且跟注浆量有很大关系.根据地层损失及注浆量的空间分布规律,应用镜像方法原理,采用数值积分方法,对隧道推进过程中由地层损失和注浆产生的位移进行空间分析,得到隧道周围土体的空间位移分布.计算结果与天津地铁施工过程的现场实测结果对比表明该方法有效可靠.

<Abstrcat> Tunneling in urban areas causes the movement of the soil around the tunnel, so e stimating potential soil movement is very important to control it and protect ex isted construction foundation and underground pipeli nes. Soil displacement is induced by ground loss and is affected by injection am ount. According to the regularities of 3-D distribution of ground loss and inj ection amount, using image method theory, the numerical integrating in 3-D anal yzing for ground loss and injection induced displacements during tunneling are s tudied. Comparing with the observed results of Tianjin underground railway proje ct, it is identified to be dependable.