Abstract
The vacuum preloading will produce an effect of tension fracture on existing road. We have established the mechanical model of vacuum preloading in vacuum preloading zone by using FLAC3D software and analyze the influence of the supporting structure, which is the high pressure jet grouting pile. The influential area of vacuum preloading with the high pressure jet grouting pile of the expressway is 20 meters and the largest settlement is 2.24 centimeters. Obviously, the high pressure jet grouting pile can weaken the influence of vacuum preloading on the expressway obviously more.
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