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对日本本州岛上的两个多发性滑坡区（Ｓｏｄｅｃｈｉ和Ｙｏｎａｉｈａｔａ滑坡区）进行的现场监测发现，即使滑坡为多发性粘土滑坡，其地面坡坏仍是以普通滑坡的形式扩展。表面位移的迅速增大与地下应变的增大同时发生，从而造成大规模的连续滑坡。因此，当受破坏的表面连成一体时，整个边坡开始崩塌。进行滑坡粘土环剪试验以确定３个抗剪强度参数：（１）完全软化抗剪强度参数Φ′（扰动粘土的峰值抗剪强度参数）；（２）试样分裂抗剪强度参数Φ′ｓｓ（本研究中新的提法）；（３）残余抗剪强度参数Φ′ｒ。稳定性分析发现Φ′ｓｓ是地面破坏传递阶段用来表示边坡稳定性最恰当的抗剪强度参数，该成果初次通过确定试样分裂抗剪强度参数Φ′ｓｓ将地面破坏传递机制运用于边坡稳定性分析。
On-site monitoring of two multiple landslide areas (Sodechi and Yonaihata landslides) on the island of Honshu in Japan found that even with a landslide as a multiple clay landslide, the ground slopes are still spreading in the form of ordinary landslides. The rapid increase of surface displacement occurs simultaneously with the increase of underground strain, resulting in large-scale continuous landslides. As a result, the entire slope begins to collapse when damaged surfaces become integrated. (1) Fully softened shear strength parameter Φ ’(peak shear strength parameter of disturbed clay); (2) Specimen shear strength parameter Φ’ss (New formulation in this study); (3) Residual shear strength parameters Φ’r. The stability analysis shows that φ’ss is the most appropriate shear strength parameter for the slope failure during the transmission of ground failure. The results apply for the first time by determining the shear strength parameter Φ’ss Slope stability analysis.