Soft Rock Mass Research Articles

In-situ dynamic deformation properties of soft rock masses : Ishikawa, K; Miyajima, K; Hibino, S; Fujiwara, Y; Yamagata, M Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10–15 April 1983V1, PA5–A8. Publ Rotterdam: A. A. Balkema, 1983

The results of in-situ dynamic loading tests are summarised in order to estimate the deformation behaviour of foundation rocks during earthquakes. From the results their dynamic elasto-plastic and cisco-elastic properties were classified. The number of the covering abstract of the congress TRIS no. 385148. (TRRL)

Mechanical properties of soft rock and rock mass : Adachi, T; Ogawa, T; Hayashi, M Proc 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15–19 June 1981, V1, P527–530. Publ Rotterdam: A. A. Balkema, 1981

Mechanical properties of soft rock and rock mass : Adachi, T; Ogawa, T; Hayashi, M Proc 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15–19 June 1981, V1, P527–530. Publ Rotterdam: A. A. Balkema, 1981

On Comparison of Two Sub-surface Structures Obtained by Seismic Prospecting and by Boring Cores

In order to clarify the sub-surface structure of landslide areas, we usually carry out boring investigation and seismic prospecting. As the sub-surface structure obtained by a seismic prospecting is one based on elastic properties of rock bodies, so it does not always agree with the geological structure of a landslide mass obtained by visual inspection of boring cores. The difference is important problem in landslide investigation.In order to clarify the sub-surface structure of landslide areas, we usually carry out boring investigation and seismic prospecting. As the sub-surface structure obtained by a seismic prospecting is one based on elastic properties of rock bodies, so it does not always agree with the geological structure of a landslide mass obtained by visual inspection of boring cores. The difference is important problem in landslide investigation.Main results are collected in Fig. 5 to 7. By the figures, it is clear that the depths of the bedrocks of which Vp exceed 3.0km/s are in approximate agreement with the depths of boundaries between soft and hard rock masses. By the data of the boring cores, these soft rock masses are usually composed of debris deposits or weathered crystalline schists, and are considered as sliding masses. On the other hand, the hard rock masses are the basement and are stable.Conclusionally, seismic prospecting is effective for the determination of the depth of landslide masses and the bottom of boring should be in hard rocks.