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一、基本情况这次试验工作,采用相似材料模拟的方法,研究某工程具体情况的几个问题,如围岩的破坏机理,开挖的影响范围,衬砌的支护作用,衬砌的荷载等等。在这次试验工作中,我们只作了平面模拟试验,模拟钢架的跨度为3m,装料高度为1.8m。峒库是在Q_2黄土层中,峒顶至地表的距离约40m,选用三绞拱的装配式钢筋混凝土衬砌,断面为椭圆形(长轴b=5m,短轴a=3m,在最下部有0.5m的直墙段)。依据上述情况,模型的例定为1:20。
First, the basic situation This test work, the use of similar materials simulation method to study the specific circumstances of a project of several issues, such as the destruction mechanism of the surrounding rock, the scope of the excavation, the lining support, lining load, etc. . In this test work, we only performed a plane simulation test, the span of the simulated steel frame was 3m, and the charging height was 1.8m. In the Q-2 loess layer, the dome is about 40m from the dome to the surface, and a three-stranded arch is used to make the reinforced concrete lining. The section is elliptical (the major axis is b=5m, the minor axis is a=3m, and the lowest part is 0.5m straight wall section). Based on the above situation, the model is set to 1:20.