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本文为地下工程断面上二向压力方向及量值计算方法的一部分,主要论点为:巷道断面上二向压力的方向,可以通过圆形巷道径向变形率η计算断面结构径向变形系数λ,然后利用λ的极大值和极小值径向进行判定。而η和λ值可根据实测圆形巷道径向收敛量进行计算,即 D=⊿D/D,λ_(A/a)=η_A/η_a. 文章利用弹性理论证明了二向压力下P>Q时,与压力P方向平行的径向λ_p为极大值λ_(max),与压力Q方向平行的径向λ_Q为极小值λ_(min)。并以岩体工程地质力学理论分析区域地应力场特征和与其对应的破坏形态作了印证。本文提出的这一方法,解决了无法量测原地应力时,工程断面上大、小压力方向的判定问题,为支护结构形式的确定及有限元分析提供了依据。
This paper is part of the calculation method of the two-way pressure direction and the magnitude of the underground engineering section. The main argument is: the direction of the two-way pressure on the tunnel section, the radial deformation coefficient λ of the section structure can be calculated by the radial deformation rate of circular tunnel, Then use λ maximum and minimum radial decision. And η and λ values can be calculated according to the radial convergence of the measured circular roadway, namely D = ⊿D / D, λ_ (A / a) = η_A / η_a.The elastic theory is used to prove that P> Q , The radial direction λ_p parallel to the pressure P direction is the maximum value λ max and the radial direction λ Q parallel to the pressure Q direction is the minimum value λ min. The characteristics of the geotemperature field in the area and the corresponding failure modes are also confirmed by the geomechanics theory of rock mass engineering. This method proposed in this paper solves the problem of determining the direction of large and small pressure in engineering cross-section when the in-situ stress can not be measured and provides the basis for the determination of support structure form and finite element analysis.