盾构开挖面极限支护力的简化计算公式

发布时间：2018-01-24 03:36

本文关键词： 楔形体模型盾构开挖面极限支护力线性拟合　出处：《地下空间与工程学报》2017年04期 　论文类型：期刊论文

【摘要】：盾构开挖面极限支护力的确定是盾构法施工中一个需要解决的重要问题,基于楔形体模型对盾构开挖面极限支护力的简化计算研究,提出了极限支护力可以通过线性拟合得到。该方法将极限支护力简化为砂土内摩擦角φ的线性公式。通过对地面附加应力P0=0,砂土的重度γ=18 k N/m3,开挖面直径D=6 m,埋深H=10 m时的lnσT与φ的关系曲线的线性拟合得到该条件下的盾构开挖面的极限支护力的简化计算的线性公式,又通过引入砂土的重度影响系数a、盾构的开挖面直径影响系数b和埋深的影响系数c,得出了在一定范围内适用的考虑砂土的重度、盾构的开挖面直径和埋深等影响因素的盾构开挖面的极限支护力的简化计算的线性公式,简化了盾构开挖面极限支护力的求解过程。
[Abstract]:The determination of the limit support force of shield excavation face is an important problem to be solved in shield construction. Based on the wedge body model, the simplified calculation of shield excavation surface limit support force is studied. The limit support force can be obtained by linear fitting. This method simplifies the ultimate support force to the linear formula of sand internal friction angle 蠁. The heavy 纬 -ray of sand is 18 K N / m 3, and the diameters of excavated surface are 6 m. The linear fitting of the relation curve between ln 蟽 T and 蠁 at the depth of 10 m in depth of 10 m gives the simplified linear formula for calculating the limit support force of shield excavating surface under this condition. By introducing the serious influence coefficient a of sand, the influence coefficient b of excavating surface diameter of shield machine and the influence coefficient of buried depth c, it is concluded that the weight of sand soil can be considered in a certain range. The linear formula for the simplified calculation of the limit support force of the shield excavation surface with the influence factors such as the diameter of the excavating surface and the depth of burying of shield machine simplifies the process of solving the ultimate support force of the shield excavating surface.
【作者单位】：华北科技学院安全工程学院;北方工业大学土木工程学院;
【分类号】：U455.43
【正文快照】： 0引言盾构法施工中开挖面支护压力的确定一直是该方法中的关键。因为随着开挖面支护压力的增大或减小均会引起围岩变位破坏,支护压力小于极限支护压力,将发生开挖面坍塌事故,因此,确定极限支护压力是保证盾构正常施工的基础。目前,关于盾构开挖面极限支护力的理论研究主要有微

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