An inversion determination method of rainfall type landslide shear strength parameters

Abstract

The invention relates to an inversion determination method for rainfall type landslide shear strength parameters, and belongs to the technical field of slope engineering stability evaluation. The method comprises the following steps that 1, the basic characteristic value of the cohesive force cj and the internal friction angle (shown in the specification) of the side slope rock-soil body is determined; 2, the basic characteristic value of the side slope rock-soil body is obtained, 2, monitoring a slope monitoring point cumulative displacement value Si and rainfall intensity Qi; Step 3, determining the side slope underground water level Hi under different rainfall conditions at the ti moment; Step 4, determining a slope stability coefficient Fij under the basic characteristic parameter condition of all the c,(shown in the specification); 5, determining a slope stability coefficient F0i displacement equivalent monitoring variable Lambda i; 6, determining the correlation degree Lambda 0ibetween the slope stability coefficient F0i and the displacement equivalent monitoring variable Lambda i; And 7, determining the cohesive force cj and the internal friction angle (shown in the specification) of the side slope according to the grey correlation degree. According to the method, the calculation result is accurate, and the overall shear strength of the side slope can be better reflected. and moreover, the operation steps are easy to implement, and the calculation cost is lower than that of other determination methods.

Description

technical field [0001] The invention relates to an inversion method for measuring shear strength parameters of a rainfall-type landslide, and belongs to the technical field of slope engineering stability evaluation. Background technique [0002] In recent years, the effect of geological disasters has caused great harm to people's lives and property and the country's infrastructure construction. Therefore, the country invests hundreds of millions of funds every year to control, monitor and warn of geological disasters. According to the latest "National Geological Disaster Bulletin" issued by the China Geological Survey, in the past five years from 2012 to 2016, a total of 58,566 geological disasters occurred nationwide, including 41,884 landslide geological disasters, accounting for 71.5%. Especially under rainfall conditions, the probability of instability and failure of landslides is greater, which also shows from the side that monitoring and early warning of the overall st...

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Problems solved by technology

The present invention overcomes the limitation that the number of test samples of the traditional measurement method is relatively small, the value of the overall shear strength parameter of the slope is replaced by the test result of a small number of samples, and the limitation of the high test cost, and proposes a shear strength parameter cohesion c of the slope , Internal friction angle The comprehensive inversion measurement method is used to obtain the overall cohesion c and internal friction angle of the slope The value of the calculation result is more representative of the overall parameter value of the slope

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