A Study Of Application Of Shallow Seismic Refraction Methods In Engineering

Shallow seismic refraction wave method is put forward from the 1930s, have been widely applied in engineering geology survey, whether in the field gathering, material handling equipment to explain or in theory of basic research method has a tremendous progress. With other geophysical exploration methods, data quality is a foundation, and material handling, they are the key for geological interpretation is most important. Especially in the collection of the data is not very good circumstances, data processing, plays a more important role. Although influence factors of refraction wave interpretation accuracy, but there are many methods to choose reasonable explanation to improve precision of exploration, is a kind of effective method.Papers on the theory of shallow seismic exploration and refraction wave interpretation method on the basis of research, this paper analyzes the research method of t 0, the method of surface stripped and Hales. Think of surface strip method can underground structure can give detailed analysis, But as the underground structure complicated, its analytical error is also increased. Because it uses the negative direction from the wave, in different places in the interface of the reflection refraction and reach the surface produces the same observation. According to this problem, use from the same sites reflecting interface strata formation of refraction wave came, and to reduce the reflector and because the formation and the error caused by this method, namely, Hales, but we discovered that method by the method of rice surface rolling, it is great influence on refraction interface extremely rules or buried deep can give good effect, Because of its application is the method of t 0 approximate an isosceles triangle high as the depth of the interface for refraction refraction interface level or curvature not too big time is more accurate.Based on the practice of work, his adopted for some application examples above three methods were analyzed. In the process of railway construction in different complex geological conditions emerge in endlessly, covering layer thickness in the approaching or over 100m and the bedrock surface Angle, and more changeable recessive fault and lithologic interface. Shallow seismic-refraction on actual railway tunnel investigation solved many problems, for railway route provided the necessary reference material, have a good effect.