Experimental research on 3D geological directional seismic prediction during tunnel construction
LOU Guochong1，2，SUN Zhitao1，MAN Lingcong1
(1. School of Civil Engineering，Shijiazhuang Tiedao University，Shjiazhuang，Hebei 050043，China；2. Key Laboratory of Road and Railway Engineering Jointly Established by Hebei Province and Ministry of Education，Shijiazhuang Tiedao University，
Shjiazhuang，Heibei 050043，China)
Abstract：In order to solve the key technical problems of multiple interference signals，poor adaptability and low prediction accuracy in the seismic wave advance geological prediction during the new tunnels construction，a high-performance 3D directional geological prediction method which suit to the space and process of the tunnel construction is established by using the easily operated hammering source in this paper，and exploratory test research is carried out in combination with several newly-built tunnels on Zhang-Ji-Huai Railway. The results show that：(1) The directional three-dimensional advance prediction method is suitable for tunnel construction space and construction process，which can effectively improve the accuracy of advance geological prediction. (2) The 18-pound hammer source has low excitation frequency and strong energy，which can meet the requirements of the new tunnels. and the prediction distance is over 100 m. (3) Hammering source has strong repeatability，which can improve the signal-to-noise ratio and fidelity by stacking. It is an ideal low frequency source for tunnel advance prediction. (4) This method is easy to operate and control，and can be used in different tunnel excavation methods. (5) This method has high prediction accuracy and clear detection direction，and can accurately predict the bad geological conditions such as karst，water gushing，fault and surrounding rock grade behind the tunnel face.
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2020, Vol. 39 
