The damage during hydraulic fracturing mainly included clay swelling and grain migration, built up created by mechanical impurities, the damage of fracture conductivity and so on.
After being treated by vacuum preloading, the physical mechanical indexes of the soft clay and the strength and bearing capacity of the soil were improved obviously.
The results indicated, when compared to the pure epoxy resin, that the mechanical and thermal properties of the nanocomposite could be greatly improved by addition of low clay loading.