Method for forecasting transient unloading induced vibrations based on strain energy of rock masses

Abstract

The invention discloses a method for forecasting transient unloading induced vibrations based on the strain energy of rock masses, which comprises the following steps: establishing a function relation between the strain energy Sa released by excavated rock masses and a peak vibration velocity v of a transient unloading induced vibration based on dimension analysis; and actually measuring a vibration waveform of surrounding rocks and calculating the strain energy of the excavated rock masses, and based on the function relation between the strain energy Sa released by excavated rock masses and a peak vibration velocity v of a transient unloading induced vibration, obtaining a transient unloading induced vibration forecasting formula by using a nonlinear fitting method, thereby carrying out forecasting on the transient unloading induced vibration of the excavation of a deep underground cavern. The method disclosed by the invention improves the forecasting accuracy of the transient unloading induced vibration of the blasting excavation of deep rock masses, and can be widely applied to the forecasting of the transient unloading induced vibration of the blasting excavation of deep underground engineering such as water & electricity, transportation, mines, and the like.

Description

technical field [0001] The invention relates to a method for forecasting vibration induced by transient unloading based on rock mass strain energy, which is suitable for forecasting vibration induced by transient unloading of ground stress during blasting and excavation of deep underground projects such as water conservancy and hydropower, transportation, and mines. Background technique [0002] With the continuous development of my country's economic construction and national defense construction, there are more and more deep rock mass excavation projects, such as mines over a kilometer, underground caverns for hydropower stations in Southwest China, deep storage of nuclear waste, deep underground protection projects, etc. In the environment of large burial depth and high geostress, rock mass often stores high strain energy. During the blasting excavation process, accompanied by the breaking of the rock mass and the formation of a new free surface caused by the explosive ex...

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Problems solved by technology

[0006] Aiming at the defects of existing transient unloading-induced vibration prediction methods, the present invention proposes a transient unloading-induced vibration prediction method based on rock mass strain energy with wider application range and higher prediction accuracy

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