Slope excavation stability evaluation method based on dynamic elastic modulus monitoring

Abstract

The invention relates to a construction project evaluation method, in particular to a slope excavation stability evaluation method. The method comprises the following steps of: acquiring initial dynamic elastic moduli of different depths of an underground high and steep slope before excavation and dynamic elastic moduli in an excavation process; calculating dynamic elastic modulus change values corresponding to different stratum depths, and determining the average damage degree of slope excavation; and establishing a quantitative relationship between the average damage degree and a stability coefficient, and determining the stability coefficient in the slope excavation process. According to the slope excavation stability evaluation method based on dynamic elastic modulus monitoring provided by the invention, the time factor can be considered, the dynamic cause and mechanism of slope instability are coupled, and the defects and limitation of application of a traditional limit equilibrium method and a displacement time sequence method can be effectively overcome.

Description

technical field [0001] The invention relates to a construction project evaluation method, in particular to a side slope excavation stability evaluation method. Background technique [0002] With the rapid development of the national economy and major engineering construction, my country has ushered in the peak period of underground engineering construction and development, such as underground foundation pit excavation engineering, mine slope mining engineering, etc. The first problem to be faced in underground engineering construction is the stability evaluation of underground high and steep slope excavation. However, the excavation process of underground high and steep slope engineering will inevitably lead to damage to the slope structure and strength, especially when the slope Encountering block crack structures with large sections in the rock mass structure will bring huge and irreparable losses and disasters to underground engineering construction and the safety of life...

AI Technical Summary

Problems solved by technology

As one of the slope stability evaluation methods, the slope displacement time series method only monitors and predicts slope stability based on single-dimensional displacement or displacement rate, and cannot consider the factors that cause slope displacement changes from multiple aspects and dimensions. Therefore, the accuracy of the displacement time series method will be greatly affected, and the complex dynamic change law of the slope cannot be accurately judged; the limit equilibrium method is a method based on slope failure. It is a mechanical evaluation model based on clear stability mechanism and stress conditions, and has a clear instability criterion, that is, the stability factor F s = 1

However, this evaluation model is static and cannot take the time factor into consideration. For high and steep underground slopes, the continuous excavation disturbance runs through the entire excavation process of the slope, and the stress redistribution in the slope body is always going on. The slope height and shape are constantly changing during the excavation process, which makes the limit equilibrium method that cannot consider the stress-strain relationship of the soil have certain limitations in the stability monitoring and evaluation of underground high and steep slopes

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