【摘要】 运用物理模拟方法,研究了在循环荷载作用下层状节理岩体非锚固与锚固模型的弹性模量E随岩体分层厚度h和块度a(岩块体积的立方根)的变化规律。试验的16个模型是层状和层状节理岩体非锚固与锚固模型各4个。得出的结论是:层状与层状节理岩体非锚固模型的E随h或 a 呈指数规律变化。层状与层状节理岩体,在第1加载循环时E随h或a呈对数规律变化;在循环加载时E随h或 a 呈线性规律变化。在非锚固条件下,岩体发生由表及里的层裂破坏,而锚固使层裂破坏得到了有效控制,模型破裂后仍具有良好的整体承载性能。岩体的h和a越小,锚固效果越好。高应力条件下对层状与层状节理岩体的锚固必须强调各锚固件的强度和锚杆的预紧力。更多还原

【Abstract】 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.更多还原