Landslides

Effects of Landslides and Mudflows Associated with the May 1980 Eruption of Mount St. Helens, Northwestern U. S. A.

Robert L. Schuster

1984 Volume 21 Issue 3 Pages 1-10
Published: December 25, 1984
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.3313/jls1964.21.3_1

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Consideration on the Relations between Landslide and Snow in Niigata Prefecture

Kiyomichi AOYAMA, Saburo NAKAMATA, Shoji OGAWA

1984 Volume 21 Issue 3 Pages 11-16_1
Published: December 25, 1984
Released on J-STAGE: July 04, 2011

DOIhttps://doi.org/10.3313/jls1964.21.3_11

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The authors studied the relations between yearly and monthly numbers of occurrence of landslides and meteorological data especially on snow cover in Niigata Prefecture, which is well known as one region of higher snow cover and much landslides in Japan, and pointed out that the occurrences are concentrated in the snowmelt season. The continuous observation records of pore water pressure and height of snow cover, carried out by the authors at Ono landslide area, lead to the conclusion that the cause is continuous infiltrations of snowmelt water which increases pore water pressure near the slip surface dring the snowmelt periods.

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On the Relation ship between Smectite and Clinoptilolite in Some Landslides

Haruo SHUZUI

1984 Volume 21 Issue 3 Pages 17-23_1
Published: December 25, 1984
Released on J-STAGE: February 25, 2011

DOIhttps://doi.org/10.3313/jls1964.21.3_17

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X-ray diffraction examination in three Tertiary-Landslides, different types and sizes in Tohoku district has revealed that Detritus slump and active moved Rock glide are abundant in smectite compared with primary type of Rock block slide in slip surface.
The relationship between smectite and clinoptilolite detected in clay-size material shows to be a inverse correlation and much content of smectite is almost invariabley present in the neary part of slip surface. It is suggested that smectite mainly containing in the slip surface have been derived from the alteration of clinoptilolite in consequence of cristallization in 020 direction.

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A New Method for Inverse Calculation of c and φ on a Slip Surface (Part II)

Inverse Calculation on the Basis of Fellenius Method

Takuo YAMAGAMI, Yasuhiro UETA

1984 Volume 21 Issue 3 Pages 24-31_1
Published: December 25, 1984
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.3313/jls1964.21.24

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Our first paper (Part I) has been mainly concerned with the fundamental concept of the newly proposed inverse calculation method of c and φ along a given slip surface. The present paper deals with the embodiment of the concept when the ordinary method of slices (Fellenius Method) is adopted as a means to calculate factors of safety. Results of appling this procedure to some fictitious problems are also presented to demonstrate the availability of the method. As a result, it has been made clear that the proposed method is particularly effective with the utilization of a digital computer.
Applications of this method to real landslides will appear in a succeeding paper.

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