ANALYSIS OF GROUTING CONSTRUCTION TECHNOLOGY IN BEDROCK FISSURE
Taking the foundation and foundation engineering of a city building with a foundation pit depth of 25.85 m as an example,the site investigation report shows that there are two regional fault structural influence zones and four small faults in the site.According to the seepage analysis,the seepage velocity of groundwater is large after foundation pit excavation,which mainly occurs in the sand layer at the top of subway tunnel and the broken rock section at the bottom of foundation pit supporting structure.In order to prevent underground water from flowing around the bottom of the foundation pit envelope after foundation pit excavation,causing the change of water level around the subway to have an adverse impact on the deformation of the subway tunnel and the bottom of the foundation pit,a deep water stop curtain is added inside and outside the foundation pit supporting structure to form an anti-seepage wall,that is,deep water stop grouting is carried out in the bedrock crack development area.
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