In recent major earthquakes, the researchers have found the need for consideration of vertical seismic acceleration for the stability analysis of the man-made and natural slopes. However, in most past studies, the per...In recent major earthquakes, the researchers have found the need for consideration of vertical seismic acceleration for the stability analysis of the man-made and natural slopes. However, in most past studies, the performance of slopes has been assessed by accounting only the horizontal seismic component of the ground motion, without giving due weightage to the effect of vertical component. In the present study, analytical expressions are derived to determine the factor of safety, yield seismic coefficient and consequently the seismic displacement of cohesionless soil slope under combined horizontal and vertical components of the ground motion. The derivation uses the Newmark's sliding block approach, in which the soil slope with a planar failure surface within the framework of conventional pseudo-static analysis is assumed to follow the Mohr-Coulomb failure criterion. The effects of vertical seismic coefficient on the stability of cohesionless slope have been studied through a set of graphical presentations for a specific range of soil parameters. It is observed that overlooking the effect of the vertical component of the ground motion on factor of safety and the displacement while designing the slope may be detrimental, resulting in the slope failure. The general expressions presented in this paper may be highly useful in the field of earthquake geotechnical engineering practice for designing the cohesionless soil slopes under combined horizontal and vertical seismic loads.展开更多
在光频域反射(Optical Frequency Domain Reflection,OFDR)技术的分布式光纤测量方法的基础上,提出了基于欧拉梁理论推导出光纤测量应变与土体水平位移之间的转换关系,并通过室内实验进行了验证,证实了分布式光纤测水平位移的可行性和应...在光频域反射(Optical Frequency Domain Reflection,OFDR)技术的分布式光纤测量方法的基础上,提出了基于欧拉梁理论推导出光纤测量应变与土体水平位移之间的转换关系,并通过室内实验进行了验证,证实了分布式光纤测水平位移的可行性和应变-位移转换关系的准确性,且将传统测斜仪法与光纤测量方法分别在基坑工程中得到了应用。通过试验,光纤测量方法能够准确详细地量测深层土体在开挖过程中的水平位移变化情况。展开更多
文摘In recent major earthquakes, the researchers have found the need for consideration of vertical seismic acceleration for the stability analysis of the man-made and natural slopes. However, in most past studies, the performance of slopes has been assessed by accounting only the horizontal seismic component of the ground motion, without giving due weightage to the effect of vertical component. In the present study, analytical expressions are derived to determine the factor of safety, yield seismic coefficient and consequently the seismic displacement of cohesionless soil slope under combined horizontal and vertical components of the ground motion. The derivation uses the Newmark's sliding block approach, in which the soil slope with a planar failure surface within the framework of conventional pseudo-static analysis is assumed to follow the Mohr-Coulomb failure criterion. The effects of vertical seismic coefficient on the stability of cohesionless slope have been studied through a set of graphical presentations for a specific range of soil parameters. It is observed that overlooking the effect of the vertical component of the ground motion on factor of safety and the displacement while designing the slope may be detrimental, resulting in the slope failure. The general expressions presented in this paper may be highly useful in the field of earthquake geotechnical engineering practice for designing the cohesionless soil slopes under combined horizontal and vertical seismic loads.
文摘在光频域反射(Optical Frequency Domain Reflection,OFDR)技术的分布式光纤测量方法的基础上,提出了基于欧拉梁理论推导出光纤测量应变与土体水平位移之间的转换关系,并通过室内实验进行了验证,证实了分布式光纤测水平位移的可行性和应变-位移转换关系的准确性,且将传统测斜仪法与光纤测量方法分别在基坑工程中得到了应用。通过试验,光纤测量方法能够准确详细地量测深层土体在开挖过程中的水平位移变化情况。
