Design Method and Its Engineering Application on a Combined Method of Vacuum Preloading and Pneumatic Fracturing for Soft Ground Improvement
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Abstract
The combined method for vacuum preloading and pneumatic fracturing is a new soft earth foundation treatment. It formed a series cracks when the high pressure gas entered into soils, then the penetrating quality increased, the settlement rate was accelerated and construction times have been cut down, thus the goal of economic efficiently reinforcement of deep soft foundation been achieved. Based on the purpose of settlement deformation controlling, the design principles, design contents, parameter choice and design calculation method was put forward, by the combined method of vacuum preloading and pneumatic fracturing for soft ground improvement. After that, the method was applied to the deep soft soil improvement of Funing-Jianhu Highway, some indexes was monitored such as ground surface settlement, horizontal displacement of deep soft soil, and CPTU static point resistance and good effect was obtained. The design method can be reference basis to engineering application.
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