Method for analyzing change of force applied to fractured rock slope along depth under heavy seismic load

Abstract

The invention provides a method for analyzing change of force applied to a fractured rock slope along depth under a heavy seismic load. The method comprises: a. establishing a fractured-rock-slope equivalent model, and presetting cracks of different angles in the fractured-rock-slope equivalent model; b. inputting simulated seismic waves into the fractured-rock-slope equivalent model; c. according to a force application result of the fractured-rock-slope equivalent model after the simulated seismic waves are input, acquiring an effect of the cracks on an slope internal force under a seismic load. The invention discloses, from a micro perspective, a mechanism in which a rock slope deforms and breaks under a dynamic load, and proposes a new dynamic rock breaking strength criterion based on fracture mechanics, to help propose a reasonable and economical protecting and retaining system, so as to reduce an impact of a broken slope on a surrounding environment in a disaster. According to an analysis method provided by the invention, a standard slope design method is established, and a perfect research foundation and basis are laid for applications in projects such as landslide control, high and steep slope protection, and so on.

Description

Technical field [0001] The invention relates to the field of slope engineering, in particular to a method for analyzing the forces on a rocky slope with cracks along the depth under strong earthquake loads. Background technique [0002] my country is a country with many earthquakes. In recent years, there have been many strong earthquakes, such as the Tangshan earthquake and the Wenchuan earthquake. According to the analysis of the number of earthquakes and the intensity of earthquakes in recent decades, earthquakes in my country have a tendency of increasing, and they have the characteristics of shallow source, high intensity, and high frequency, mainly in the central and western regions. At the same time, my country is a mountainous country, especially the southwest region has a large number of natural slopes. Due to the implementation of the western development strategy, a large number of infrastructure facilities, roads, railways, housing construction, bridges, etc. have been...

AI Technical Summary

Problems solved by technology

Rock fracture mechanics gives the propagation criterion and direction of special single cracks or regularly distributed cracks in homogeneous materials, but it is often unsatisfactory in the theoretical research of complex multi-cracked rocks

To sum up, the mechanical mechanism of fractured rock slopes under seismic loads is quite complex. At present, there are many domestic and foreign analysis theories for the static stability of slopes and they have been developed relatively maturely. Stability analysis is still under development

At the same time, in the research and analysis of the stability of rock slopes, only the influence of the existence of rock fissures on the stability of slopes is considered, or only the influence of earthquake action on the stability of rock slopes is considered. Analysis and research on the influence of the simultaneous action of seismic load and rock slope on the stability of rock slope

At the same time, in terms of design parameter optimization, the current research results are usually aimed at a specific project, and the typical parameters obtained have specific regional characteristics and are not representative enough.

Moreover, at present, the research is basically aimed at a single problem, and the influence of multiple factors on slope stability is rarely considered comprehensively, which is not enough to be a sufficient criterion for slope stability.

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