Field Measurements of Passive Earth Forces in Steep, Shallow, Landslide‐Prone Areas

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  • Alessio Cislaghi
    Department of Agricultural and Environmental Sciences (DiSAA) University of Milan Milan Italy
  • Denis Cohen
    Department of Earth and Environmental Science New Mexico Tech Socorro NM USA
  • Eric Gasser
    Department of Agronomy, Forestry, and Food Sciences Bern University of Applied Sciences Zollikofen Switzerland
  • Gian Battista Bischetti
    Department of Agricultural and Environmental Sciences (DiSAA) University of Milan Milan Italy
  • Massimiliano Schwarz
    Department of Agronomy, Forestry, and Food Sciences Bern University of Applied Sciences Zollikofen Switzerland

書誌事項

公開日
2019-03
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2017jf004557
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Passive earth resistance plays an important role in slope stability analyses for predicting shallow landslide susceptibility. Three‐dimensional models estimate the contribution of this factor to slope stability using geotechnical theories designed for retaining structures and add it to the resistive forces. Systematic investigations have not been conducted to quantify this resistance in soils experiencing compression during the triggering of shallow landslides. This study presents field‐scale experimental data of passive earth force for cohesive and frictional clayey gravel evaluated at different combinations of soil depths and slopes. The experimental setup included a specialized device composed of a steel structure and a stiff plate that moved toward a mass of soil. In both dynamic and quasi‐static states, force‐displacement curves and maximum compression resistance were determined for several water content conditions induced by a rainfall simulator. The maximum dynamic force ranged from 8.49 to 31.67 kN for soil depths ranging between 0.36 and 0.50 m, whereas the quasi‐static force corresponded to 60% of the dynamic force. Furthermore, rainfall generated an additional decrease of compression resistance compared to that measured in the field. A comparison of measured data with theoretical models of passive earth force indicated that Rankine's solution provided the best estimate, whereas the logarithmic spiral approach significantly overestimated passive earth force by up to 70%. Therefore, the correct choice of geotechnical formulation or the direct use of field measurements to estimate passive earth force may significantly improve the accuracy of 3‐D limit equilibrium models for assessing slope stability over natural landscapes.</jats:p>

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