重庆沙溪庙组地层岩石单轴抗压强度研究

Study of uniaxial compressive strength of Shaximiao formation rock in Chongqing urban area

岩石单轴抗压强度是工程勘察中最基本的岩体力学参数之一,已广泛应用于岩石地基设计、隧洞围岩分类、岩体质量分级、土石开挖分级和岩石地基验收中。重庆市区约70%面积坐落于侏罗系中统沙溪庙组地层之上,研究沙溪庙组地层岩石单轴抗压强度具有十分重要的意义。从工程勘察的实践出发,通过对重庆市沙溪庙组岩石抗压强度的统计和对软化系数的研究,建立了饱和抗压强度与天然抗压强度之间的经验公式。通过对计算值和试验值的大量对比,结果显示,计算值的可靠性高,可替代试验值,应用前景广阔。

The uniaxial compressive strength （UCS） is one of the most basic parameters in geotechnical investigation;it is widely used in the rock foundation design, surrounding rock classification, rock mass classification, rock excavation grading, and rock foundation check and its acceptance. Proximately, 70% of Chongqing urban area is located in the middle Jurassic Shaximiao Formation;so that the UCS has great significance in Shaximiao formation research. From the exploration project practices, this article seeks to establish the relation between the UCS and the softening coefficient of Shaximiao formation rock. An empirical formula has been established between the saturation and natural compressive strength by comparing the calculated values and the large number of experimental values. The results show a high reliability of the calculated values which can replace the experimental values to get a broad application prospects.