Estimation of Average Shear Strength Parameters along the Slip Surface Based on the Shear Strength Diagram of Landslide Soils:—Shimajiri-mudstone landslides, Okinawa—

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The average shear strength parameters along the slip surface (c´, φ´) of the four Shimajiri-mudstone landslides having different slide patterns have been obtained by two methods involving an estimation method using the shear strength diagram of landslide soils and an ordinary method using the results of laboratory shear tests of soil samples. The deference of the two average shear strengths was small in the case of the landslides where the residual and fractured-mudstone peak strengths had been mobilized, while the two methods produced close agreement in case of the landslides where the residual and fully softened strengths had been mobilized. Although, the determination of appropriate c´, φ´ is done using the measured shear strength of slip surface soil as a fundamental rule, when it is difficult to do it due to certain restrictions, c´, φ´ can be effectively estimated using the shear strength diagram.
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