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在山区修建公路,会经常遇到粗粒类土,这类土即通称的坚隔土,它在山区路基工程中所占比例很大。在1956年的公路工程设计准则中第1407条对挖方路基(即路堑)边坡,按土石性质差异规定了边坡值,其中坚隔土(碎石土壤、砾石土壤)的挖方边坡值为1∶1～1∶0.5。从现有公路路堑边坡较广泛的调查来看,粗粒类土随土石特性及自然地质条件的不同,其稳定坡度值的变化亦大,即陡坡可达1∶0.1,缓坡可小至1∶1.5;边坡值的变化范围太大,边坡土石特性复杂,影响因素多,设计准则的规定边坡值,在实际工作应用中很难切合实际。因此,我们认为设计准则中该项数值的规定应作补充修正。目前确定边坡数值的方法有三种:标准数据法,
The construction of roads in mountainous areas often encounters coarse-grained soil, which is commonly known as rigid soil and occupies a large proportion of the subgrade engineering in mountainous areas. In Section 1407 of the Highway Engineering Design Guidelines of 1956, slope values were specified for the excavation of subgrade (ie, cut-off) slope according to the difference in the properties of the earth and stone. The slope value of the slope for the inscribed soil (gravelly soil and gravelly soil) was 1: 1 ~ 1: 0.5. Judging from the extensive survey of existing road cutting slopes, the change of the stable slope value of coarse grained soil varies greatly with the characteristics of earth and stone and the natural geological conditions, ie the steep slope can reach 1: 0.1 and the gentle slope can be as small as 1 : 1.5; The range of slope value is too large, the characteristics of rock and soil in the slope are complex, and there are many influencing factors. The slope value stipulated in the design criterion is difficult to be practically used in practical application. Therefore, we think the provisions of the numerical value in the design guidelines should be supplemented. Currently there are three ways to determine slope values: standard data method,