摘要
山西省阳泉市绕城高速拟建隧道地处娘子关—坪头坳缘翘起带内,属喀斯特剥蚀、侵蚀低山区,岩性主要为石灰岩、泥灰岩等,其中:强—中风化泥灰岩属极软岩,稳定性差,成洞困难;中风化泥灰岩属软岩,稳定性差,成洞困难;强—中风化灰岩属较软岩,稳定性差,成洞困难;中风化灰岩属较坚硬岩,稳定性较好,成洞较为容易.根据岩石稳定性,洞体围岩分为Ⅴ1、Ⅳ3、Ⅳ2、Ⅳ1、Ⅲ2 级,其中Ⅴ1、Ⅳ3、Ⅳ2、Ⅳ1 级围岩占洞体围岩的 30%,Ⅲ2 级围岩占洞体围岩的 70%.围岩稳定性较差—较好,适宜隧道修建.
Abstract
The proposed tunnel in Yangquan City,Shanxi Province,is located in the warping zone of the Niangziguan-Pingtou depression margin,categorized as a karst denudation and erosion low mountainous area.The predominant lithologies include limestone,marl,etc...Specifically,strongly to moderately weathered marl is extremely soft rock with poor stability and difficult in cave formation.Similarly,medium-weathered marl is characterized as soft rock with poor stability and also difficult in cave formation.Strongly to moderately weathered limestone is soft rock with poor stability and difficult in cave formation.In contrast,moderately weathered limestone is a hard rock with good stability and easy for cave formation.According to the rock stability,the surrounding rock of the tunnel can be divided into grades Ⅴ1,Ⅳ3,Ⅳ2,Ⅳ1,Ⅲ2,among which gradesⅤ1,Ⅳ3,Ⅳ2,Ⅳ1 collectively account for 30%of the tunnel's surrounding rock,while grade Ⅲ2 comprise 70%.Overall,the surrounding rock stability ranges from poor to good,making it suitable for tunnel construction.
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