open access

https://hdl.handle.net/2115/40225

Measurement and Numerical Analysis on Deformation of Natural Rock Slope under Temperature Variation

英語

Numerical analysis

2009-05-13

Graduate School of Engineering, Hokkaido University

Proceedings of the 3rd International Workshop and Conference on Earth Resources Technology

132-141

3rd International Workshop and Conference on Earth Resources Technology "Stepping towards sustainable geo-resources utilization and development". 13-14 May 2009. Hokkaido University Conference Hall, Sapporo, Japan.

A 767-day long displacement and temperature record for a natural rock slope in Iwate prefecture (Shimohei district, Kawai village) in Japan was monitored. The natural rock slope, poses as an existing potential failure that may cause disaster if rock falls occur. Six surface crack displacement sensors (ch1–ch6) were installed on surface of natural rock slope. Displacements were mainly due to thermal strains and only ch1 gave a steep opening of fracture. Numerically, the behaviour of rock slope with a one-meter deep fracture under temperature variation was analysed using a (5 m × 5 m) two-dimensional plane strained, confined and unconfined models using elastic and elasto-plastic finite element analysis. Generally, in elastic and elasto-plastic conditions, fracture closed with temperature raising and vice-versa. Expansion of rock mass due to freezing at sub-zero temperatures was observed. Large tensile stresses appear at the fracture tip when temperature lowered, thus generating tensile failure and a small increase in fracture opening under elasto-plastic conditions in confined cases only.

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