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松动圈是岩体地下硐室稳定性评价和设计的重要指标之一。地下硐室的几何特性对松动圈的范围有一定的影响。运用显式有限差分法,从地下硐室的断面积、高度和跨度以及断面形状等方面就地下硐室的几何性质对松动圈影响的问题进行了数值模拟研究。结果表明:随着断面面积的增大,松动圈范围扩大,扩展速度加快;随着断面跨高比的增大,松动圈范围增大;高跨比变化对松动圈范围的影响较小;断面形状对松动圈范围及扩展速度有很大影响。研究结果对地下硐室的开挖以及衬砌设计具有参考意义。
Loosening ring is one of the important indexes for the stability evaluation and design of underground chamber in rock mass. The geometric characteristics of the underground chamber have a certain impact on the scope of the loose ring. Using the explicit finite difference method, the numerical simulation of the influence of the geometrical properties of the underground chamber on the loose ring was carried out from the aspects of the sectional area, height and span of the underground chamber and the shape of the section. The results show that with the increase of cross-sectional area, the area of loose ring expands and the expansion speed increases. With the increase of cross-section ratio, the area of loose ring increases, while the effect of high-span ratio has little effect on the area of loose ring. The shape of the loose ring range and the expansion speed has a great impact. The research results have reference significance for excavation of underground chamber and lining design.