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RMR岩体分级技术是以现场工程地质调查结果为主要依据,结合现场钻探及实验室试验进行地下工程岩体分级的方法,其前提是有良好的地质露头或开挖揭示。阿尔及利亚南北高速公路希法(CHIFFA)峡谷段以隧道形式穿越,隧址区山高谷深、地形陡峻且植被茂密,人员设备均难以到达隧址,但其紧邻RN1国道,为一旁山型隧道,沿RN1国道基岩露头良好,且岩性总体单一,主要地质构造(层理、断裂)与隧道走向垂直。本次勘察主要以工程地质调查为主,钻孔S06-01虽然位于隧道左线外侧135m处,但其地层岩性、钻探取芯取样及揭示的地质构造有一定代表性,相关试验及测试应用于隧道围岩评价是可靠的。该项目具有一定代表性,可以为类似条件隧道勘察提供参考。
RMR rock mass grading is based on the results of on-site engineering geological surveys, and combined with on-site drilling and laboratory tests for grading underground rock mass, the premise is that there are good geological outcrops or excavations revealed. The CHIFFA gorge section of the Algerian north-south highway passes through the tunnel. The tunnel is steep and deep with dense terrain and dense vegetation. It is difficult for personnel and equipment to reach the tunnel. However, it is adjacent to the RN1 national highway and is a side-by-side mountain tunnel. The outcrop of RN1 national base rock is good, with a single lithology. The main geological structure (bedding and fracture) is perpendicular to the tunnel. The survey mainly focuses on engineering geological survey. Drilling S06-01 is located at 135m outside the left line of the tunnel. However, its lithology, drilling coring sampling and revealing geological structures are representative. The related tests and test applications Evaluation of tunnel surrounding rock is reliable. The project is representative and can provide reference for tunnel exploration under similar conditions.