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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。
The determination of the limit support force of shield excavation face is an important problem to be solved in the construction of shield tunnel. Based on the simplified calculation of wedge body model for the limit support force of shield tunneling surface, the limit support force Obtained by linear fitting. The method simplifies the limit support force to a linear formula of the internal friction angle φ of sand. The linear fitting of the curves of lnσT and φ with additional stress P0 = 0 on the ground and γ = 18 kN / m3 for sand, excavation face diameter D = 6 m and depth H = 10 m Under the conditions of the shield face excavation surface limit support force simplified calculation of linear formula, but also by the introduction of the severe impact of sand a, shield excavation surface diameter influence coefficient b and depth of influence coefficient c The simplified formula for calculating the ultimate supporting force of shield tunneling face considering the factors such as the seriousness of sand and soil, the diameter and depth of shield face excavation, which is applicable in a certain range, is simplified. Digging the limit support force of the process of solving.