凍結融解作用による微小亀裂を用いて岩盤のセン断強度を推定する試法
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概要
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As it is widely recognized that there is a large difference in strength between rock mass with fissures and intact test-pieces aimed to establish more useful equations that bind both strengths. For this purpose, test-pieces with numerous micro cracks made by freezing and thawing cycles were prepared, and the relation between their uniaxial compressive strength and P-wave velocity was investigated. The result showed that this relation is considerably similar to that of rock mass with fissures and indicates that this is a very useful method in laboratory. Test-pieces of welded tuff were used for this experiment because of its uniform texture and appropriate hardness. On the basis of the results of laboratory experiment because of its uniform texture and appropriate hardness. On the basis of the results of laboratory experiments on the test-pieces of intact and cracy rock, an approximate value of shear strength of rock mass can be calculated by the following equation: τ_<m0> = τ_<p0> (V_<pm> / V_<p0>)^n where, in case of soft rock (uniaxial conpressive strength q_<u0> =10〜100kg/cm^2), n=1.3〜1.7 medium hard rock (q_<u0> =100〜150), n=1.6〜2.8 hard rock class I (q_<u0> =500〜1,000), n=2.7〜4.0 hard rock class II (q_<u0> ≧1,000), n=4.0〜5.5 τ_<m0> : shear strength of rock mass (cohesion) τ_<p0> : shear strength of intact test-pieces of rock (cohesion) V_<pm> P-wave velocity of rock mass V_<p0> P-wave velocity of intact test-pieces of rock. Furthermore, the relation between shear strength of intact test-pieces of rock and that of rock mass obtained by blok shear tests at 10 localities of Hokkaido, can be approximately expressed by the following equation: τ_<m-b0>=τ_<p0>(V_<pm>/V_<p0>)^N where, in case of soft rock, N=3.0〜3.5 medium hard rock, N=3.5〜5.5 hard rock class I, 5.5〜8.0 hard rock class II, N≧8.0 τ_<m-b0> : shear strength of rock mass obtained by in-situ block shear tests (cohesion, kg/cm^2) In planning of general construction the latter value (τ_<m-b0>) has been commonly used. However, the differerence of the two values (τ_<m0> and τ_<m-b0>) must be recognized, and their application should be made according to the purpose of safety of dam, tunnel and slople stability of large cutting in rock mass, etc.
- 一般社団法人日本応用地質学会の論文
- 1980-12-30
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