| If water conservancy prospers,then all industries prosper.Water conservancy projects are the lifeblood of national economic development,and also an important support and basic guarantee for Chinese path to modernization.The water conveyance tunnel is an important component of the construction process of hydraulic engineering.During its construction process,it often encounters areas with complex geological conditions,which are the main reasons for safety accidents such as water and mud inrush.Therefore,in order to reduce the occurrence of accidents,it is very important to conduct advanced geological prediction of tunnels.The use of seismic reflection wave technology for advanced geological prediction of water conveyance tunnels is a very effective method,and it has certain guiding significance for the successful application of seismic reflection wave technology in hydraulic engineering.In practical detection,this method is difficult to meet the construction requirements due to the complex and varied conditions at the engineering site and the varying abilities of operators.In response to these issues,this paper conducted numerical simulations of seismic wave fields in advanced geological prediction of water conveyance tunnels,and verified the practicality and effectiveness of seismic reflection waves in advanced geological prediction of water conveyance tunnels through engineering examples.The following research content has been conducted:(1)Study the geophysical characteristics of common geological hazards in tunnel engineering;The propagation characteristics,wave equation,kinematics and dynamics characteristics of seismic waves are analyzed;Introduce the working principle of tunnel seismic reflection technology and the propagation characteristics of seismic reflection waves in rock media.(2)On the basis of common geological disasters in tunnel engineering,eight models in three categories,namely fault fracture zone,water bearing karst cave and water bearing thin layer,were constructed.The finite difference software Tesseral-2D was used to carry out forward simulation of each model,study the response characteristics of model wave field,and compare the detection effects of various models horizontally to analyze possible misjudgments,so as to provide reference for subsequent data interpretation.(3)Sort out the entire process of data acquisition,processing,and interpretation of tunnel seismic reflection technology.Analyze potential issues in data processing to avoid errors in data interpretation caused by improper processing procedures.(4)Taking a certain water conveyance tunnel as an example,this study focuses on the measured data results of geological disasters,and combines the corresponding models in the forward simulation process to carefully analyze the actual detection effect of seismic reflection wave technology.Through the above research content,some preliminary understanding has been obtained:the excitation and reception conditions have a significant impact on the raw data,and the key to prediction is the raw data.Poor data will lead to significant errors.Therefore,it is necessary to seal the blasting hole with water,measure the parameters correctly,and reasonably fill the amount of explosives;The receiving hole should be well coupled;Simultaneously controlling noise;Taking the seismic reflection wave technology of water conveyance tunnels as an example,it is found that the detection effect of seismic reflection wave technology in structures such as faults and lithological interfaces is good.During the research process,some issues were also identified,such as the lack of research on multiple combined targets,and the lack of in-depth research on the impact of explosive dosage on detection results.Therefore,these situations should be taken into account in subsequent work.Making seismic reflection wave technology more practical in advanced geological prediction of water conveyance tunnels. |
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