Landslips on the ground water surface and its mechanism. II. Vane tests in sand and its interpretation.:Vane tests in sand and its interpretation
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The main problem on the application of vane tests to sand is that the effective stress on the shear plane is changed by the force transmitted from the vane blades because of the drained condition.(A minor problem on the application of vane tests to sand is that the void ratio at failure is usually different from the initial void ratio under the drained condition, but the void ratio at failure can not be measured in vane tests. However, since slips themselves are estimated to take place under the drained condition in sand layers and the influence of void ratio is not so great as shown in Fig. 3, it will be unnecessary to be so sensitive for this problem.)<BR>The equation proposed by Farrent and the equation rededuced here are the corrections for this main problem. The equation deduced here is considered to be fundamentally right from the process to lead it and the examination of it in Fig. 5 indicates that it is numerically appropriate, though it will not be said that it has been verified enough. The corrective equation of vane tests includes the angle of internal friction in it. Therefore, when attempting the measurement of the variation of shear strength in the sand layer by vane tests, the variation of the angle of internal friction is also needed. However, the measurement of void ratio in the model sand layers and the relation between void ratio and the angle of internal friction by H. Inoue and the examina tion of the influence of saturation on the angle of internal friction have demonstrated that the tangent of the angle of internal friction (tanφ) can be regarded to be constant with 1-4%error in the model layers of the Toyoura standard sand (void ratio 0.78-0.85).Now it will be possible to say that the necessary means to measure the variation of in-situ shear strength in the model sand layer has been established.<BR>Finally the authors acknowledge Mr. Marui H. who is a post-graduate student in our laboratory and helped us in the direct shear tests and also acknowledge the assistant professor of our laboratory Kobashi S. for his advice and encouragement.
- 公益社団法人 日本地すべり学会の論文
公益社団法人 日本地すべり学会 | 論文
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- Landslips on the ground water surface and its mechanism. II. Vane tests in sand and its interpretation.:Vane tests in sand and its interpretation
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