Dynamic Stability Analysis of Slope Subjected to Surcharge Load considering Tensile Strength Cut-Off

Lv Guangdong; He Yi; Wei Bingsi

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Dynamic Stability Analysis of Slope Subjected to Surcharge Load considering Tensile Strength Cut-Off

机译：Dynamic Stability Analysis of Slope Subjected to Surcharge Load considering Tensile Strength Cut-Off

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Surcharge slopes are more vulnerable to instability under the effects of earthquake ground shaking, especially considering the tensile stress. In order to account for the adverse factors of seismic forces and tensile stress, the theory of soil with tensile strength cut-off is deduced and analyzed using the upper bound limit analysis method in this paper. Combined with the quasistatic analysis, the equation of critical acceleration expression for surcharge slope subjected to the dynamic conditions has been evaluated. By using the improved Newmark method, permanent displacements have been analyzed in the case of the classical earthquake ground motions. In addition, optimization algorithm has been undertaken, in which several influencing factors such as slope inclination, internal friction angle, surcharge factor, seismic load, and tension cut-off coefficient have been taken into account, and some results are verified with the classical solutions and FEM results. The results concluded the following: (1) The outcomes of verification results are accurate. (2) The critical acceleration of the slope is significantly affected by tension cut-off with the increasing of surcharge factor and seismic effects. (3) The permanent displacements of surcharge slope considering the tensile strength cut-off can be even 2 times of the traditional analysis; meanwhile, with more reduction of tensile strength, the cumulative displacements increase rapidly. Therefore, considering the influence of tensile strength cut-off is fundamental to the dynamic stability design of surcharge conditions.

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来源
《Mathematical Problems in Engineering: Theory, Methods and Applications》 |2020年第36期|5196303.1-5196303.17|共17页
作者
Lv Guangdong; He Yi; Wei Bingsi;
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作者单位

Tibet Agr & Anim Husb Univ, Water Conservancy Project, Nyingchi 860000, Peoples R China|Tibet Agr & Anim Husb Univ, Civil Engn Coll, Nyingchi 860000, Peoples R China;

Sichuan Southwestern Construct Engn Technol Co Lt, Chengdu 610081, Peoples R China;

Nanning Explorat & Survey Geoinformat Inst, Nanning 530021, Peoples R China;

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Dynamic Stability Analysis of Slope Subjected to Surcharge Load considering Tensile Strength Cut-Off

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