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软弱破碎岩体中的地应力,在地下浅部就会进入“潜塑”状态。本文分析了自重应力场(大地静力场型)和构造应力场(大地动力场型)中软弱破碎岩体的应力状态,给出了岩体由弹性进入塑性状态临界深度的计算公式,进而给出了临界深度上下岩体应力计算方法。并用实例分析了本计算方法与传统方法的误差。最后简析了上述结论在岩石地下工程应用方面的意义。
The stress in weak and broken rock mass will enter the “submarine” state in the shallow part of the earth. This paper analyzes the stress state of the soft and fragmented rockmass in the self-weighting stress field (the geostationary-field type) and the tectonic stress field (the geodynamic field type), and gives the formula for calculating the critical depth of the rock mass from the elasticity into the plastic state, Out of the critical depth up and down the calculation of rock stress. The error between this calculation method and the traditional method is analyzed with examples. Finally, the significance of the above conclusions in the application of rock underground engineering is analyzed.