# Synchronous Grouting Analysis of Shield Tunneling through High Water Pressure Fault Fracture Zone
###### Abstract  
Using numerical software to establish a three-dimensional geological model of shield tunneling through fault fracture zones, considering the synchronous grouting effect at the shield tail, the disturbance of various geotechnical structures in the fault fracture zone under deep burial and high water pressure conditions is studied. According to the comparison between the numerical model analysis results and the on-site inspection results of the entire process of Shiziyang B3 section, synchronous grouting at the shield tail is the main reason for the changes in soil and water pressure in the fault fracture zone area. The soil and water pressure changes strongly during shield tunneling, and the maximum excess pore pressure value occurs when the shield tail passes. When the shield tunneling machine is far away, the soil and water stress shows a downward trend. The impact of synchronous grouting decreases with the increase in tunneling distance. Due to the difference in permeability, the variation law of pore pressure in the fault fracture zone is significantly different from the original rock, leading to a faster increase in pore pressure in the fracture zone area and a wider range of influence.  
fault fracture zone; high water pressure; synchronous grouting; numerical analysis +
Footnote †: journal: Applied sciences  
Article  
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factor during shield tunneling construction, mainly including the stress field of rock and soil, the self-weight of the shield tunneling machine, the mud pressure on the excavation surface, and the grouting pressure at the tail of the shield.  
Previous studies have shown that the main influencing factors of shield tunneling on rock and soil disturbance problems include grouting pressure at the shield tail, mud pressure at the face of the tunnel, shield machine posture, and shield over-excavation or under-excavation [15; 16; 17; 18; 19; 20; 21]. This article uses numerical software to establish a three-dimensional geological model of shield tunneling through fault fracture zones, with a focus on the synchronous grouting effect at the shield tail. It studies the disturbance of various rock and soil structures in the fault fracture zone under deep burial and high water pressure conditions and focuses on analyzing the impact of synchronous grouting effect of shield tunneling on the surrounding rock and soil seepage flow field, stress field, and displacement field. Combined with on-site full process monitoring tests, it studies the action law of synchronous grouting of shield tunneling on rock and soil, Analyze the impact of shield tunneling on surrounding rock and provide reference for the study of grouting technology in fault fracture zones.