【作者】 王荣；

【Author】 WANG Rong;Geo & Stru Engineering Research Center of Shandong Unirersity;

【机构】 山东大学岩土工程中心；

【摘要】 陆地声纳法在浅层勘查、隧道地质预报等方面已有大量应用,它可用锤击震源在隧道壁测量围岩松弛带的深度,经与双孔对穿声波测量法对比,二者所测结果相符。陆地声纳法现场采集简便,所需时间远少于声波测量法,还可在钢筋混凝土衬砌完成后进行。陆地声纳法可在围岩面、喷层表面或衬砌表面测出松弛带的界线及其反射时,并用折射波法或共中心点法测出松弛带岩体的平均波速,由此计算松弛带的深度。在某大型地下工程做了声波测量和陆地声纳法测量松弛带深度试验二者结果相符,之后30余组处全部改用陆地声纳法。在此大型工程还用陆地声纳法和电阻率法结合探查了右边墙外老巷道(通风洞)衬砌外空区,为施工处理提供了依据。更多还原

【Abstract】 Landsonar,the elastic reflection wave recording of continues profiling with very short offset and very wide band frequency,a new survey method,has been successfully used in tens engineering projects and Geological prediction of the front of working face in the tunnel construction.It can be used to detection depth of relaxation zone of surrounding rock of a tunnel on the surface of rock or lining by hammer source.Its detecting results have been compared with results got by acoustic wave measurement method with bore- holes and their results are identical each other.When this method is used to detection depth of relaxation zone of surrounding rock of a tunnel on surface of rock or lining the hammer source is used and the geophones are set near by the source point.Along a 2- 4 m long measuring line some stations for distance 20- 30 cm between two stations are arranged,and then the data of all stations in a line are treated to a time-section on that the reflection image of the boundary line of relaxation zone can be clearly differentiated.Wave velocity can be measured by refracted wave method or common center points method on surface of rock mass or lining and the depth of the boundary line of the relaxation can be calculated.Collecting the data of Landsoner is simple and convenient and Landsoner can be used to detect on surface of lining.更多还原