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METHOD FOR EVALUATING INSTABILITY AREA AMPLIFICATION EFFECT OF FOUNDATION PIT EXCAVATION SLOPE
METHOD FOR EVALUATING INSTABILITY AREA AMPLIFICATION EFFECT OF FOUNDATION PIT EXCAVATION SLOPE
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机译：基础坑开挖斜率的不稳定区域放大效果评估缺陷区域放大效果的方法
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摘要
The present invention belongs to the field of geotechnical engineering safety evaluation and instability risk quantification, and particularly relates to a method for evaluating an instability area amplification effect of a foundation pit excavation slope. The method comprises: when no seismic action is present, reducing original soil layer mechanical parameters to enable the minimum safety coefficient to be Fi<1; adjusting a horizontal earthquake acceleration value, such that the safety coefficient of a slope under the original soil layer mechanical parameters is Fi; simulating displacement fields in the previous two steps by using a smooth particle fluid dynamics method; giving a critical value, and separately counting slope sliding areas of the two conditions; calculating an amplification value ξi between the strength reduction effect and the seismic action effect; updating the reduction coefficient and the previous earthquake acceleration value, reducing the Fi, and repeating the above operation; and fitting all horizontal earthquake acceleration values and amplification values to obtain a change curve of the instability area of the foundation pit excavation slope under the seismic action, thereby obtaining an amplification effect. According to the present invention, the amplification effect of an instability area of a foundation pit excavation slope under the action of a seismic load can be rationally, effectively and rapidly given.
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