PHYSICAL SIMULATION ON BOLTED EFFECT OF LAYERED AND JOINTED ROCK MASSES UNDER CYCLIC LOAD
循环荷载作用下层状节理岩体锚固效果的物理模拟研究

Using physical simulation method,the variety laws of elastic modulus E with the rock-layer thickness h and the fragmentation degree a,the cube root of rock block volume,of the layered and jointed rock masses under cyclic load with and without bolt support are studied in detail. The four non-bolted models and four bolted models of layered rock masses,and four non-bolted models and four bolted models of layered and jointed rock masses are adopted for testing. The thicknesses of layered rock masses are 540,270,135 and 67.5 mm, respectively. The corresponding joint intervals are 540,450,385.7 and 337.5 mm, respectively,in the layered and jointed rock masses. The fragmentation degrees of the layered and jointed rock masses are 540,380,272 and 197 mm, respectively. It is shown from the test that (1) the variety law of E with h or a of non-bolted models in layered and jointed rock masses is of exponential regularity,(2) the variety law of E with h or a of bolted models in layered and jointed rock masses is of logarithm regularity under the first loading, and linear one under cyclic loadings,(3) under non-bolted condition,the layered failure takes place in layered and jointed rock masses and (4) under bolted condition,the layered failure is effectively controlled,so that the broken models are still of good loading-bearing capacity.