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豆砾石回填与灌浆技术在护盾式TBM施工的隧道中获得了广泛应用,但是豆砾石填充层对地层抗力系数以及管片结构受力的影响有还有待研究。本文利用厚壁圆筒弹性应变理论和温克勒假设,首先建立轴对称条件下的豆砾石-地层抗力系数公式并对影响该公式的因素进行了分析。在此基础上,考虑了豆砾石填充层的非均匀分布,建立了非轴对称条件下的豆砾石-地层抗力系数公式。研究表明:(1)是否考虑豆砾石填充层的存在以及豆砾石填充层是否均匀分布对地层抗力系数具有重要影响;(2)不同岩性条件下,豆砾石填充层弹性模量均存在一临界值使豆砾石-地层抗力系数的性质发生突变;(3)豆砾石填充层厚度的增加则具有强化豆砾石-地层抗力系数性质的作用。
Beans and gravel backfilling and grouting techniques are widely used in shield TBM construction tunnels. However, the effects of bean-gravel packs on the formation resistance coefficient and the stress of the pipe structure have yet to be studied. In this paper, using the theory of thick-walled cylindrical elastic strain and Winkler’s hypothesis, we first establish the equation of soybean gravel-formation resistance under axisymmetric conditions and analyze the factors that affect the formula. On this basis, the non-uniform distribution of pea gravel packing layer was considered, and the formula of pea gravel-formation resistance coefficient under non-axisymmetric condition was established. The results show that: (1) whether the gravel packing layer is considered and whether the gravel packing layer distributes uniformly has important influence on the resistance coefficient of the formation; (2) The elastic modulus of the gravel packing layer has a critical value under different lithology conditions (3) The increase of the thickness of pea gravel packing has the effect of strengthening the pea gravel-strata resistance coefficient.