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大型地下洞室常采用高跨比2:1的圆拱直墙洞形,当岩体处于弹性状态时,根据侧压系数λ值,利用本文图7可查得顶拱中点、侧墙中点、底边中点和角缘点的最大压应力集中系数和最大拉应力集中系数。这对工程设计和施工考虑围岩稳定问题时颇有参考价值。试验表明,洞室角缘应力不能按简单叠加原理计算,例如λ=1的角缘应点压应力集中系数为3.02,而λ=0和λ=∞的角缘点压应力集中系数各为1.65和2.38,叠加后为4.33,相差43％。
Large underground caverns often use circular arch with a high span ratio of 2: 1. When the rock mass is in elastic state, according to the side pressure coefficient λ value, The maximum compressive stress concentration factor and the maximum tensile stress concentration factor at the point, bottom midpoint and corner point. This is quite valuable for engineering design and construction considering the stability of surrounding rock. The test shows that the stress at the corner of the cavern can not be calculated by simple superposition principle. For example, the stress concentration factor at the corner of λ = 1 should be 3.02, and the stress concentration factor at the corner of λ = 0 and λ = ∞ are 1.65 And 2.38, a 4.33 difference after stacking, a 43% difference.