Vacuum preloading method is widely used

The project has 5 holes, which are buried in 5 different depths and different soil locations, and groundwater observation holes are set next to them. During the vacuum, the groundwater level dropped and the pore pressure decreased. When the soil load was applied, both the pore pressure and the groundwater level increased. After the filling stopped, the pore pressure and the groundwater level decreased slowly. During the vacuum pause, the groundwater level and pore pressure increased slowly and filled. The soil is particularly fast, but it has not reached the initial value. From the pore pressure-load curve, it can be seen that the embankment has not reached the yield state throughout the construction period. Displacement observation This project adopts deep horizontal displacement observation, that is to measure inclining, and there are 4 observation points in total. The lateral displacement rate of the soil in embankment filling process is less than the design requirement value. P(H)-St Curve The PSt curve drawn according to the data of vacuum preload construction process P, S, etc. represents the relationship between vacuum degree P, settlement value S and time t, where H is the embankment filling height, vacuum degree, soft ground settlement The value varies with the evacuation time and the loading height H.

When the load composition is calculated in a stable manner, it is considered that the stable load consists of three parts: one is the load formed by the differential pressure between the inside and outside of the sealing film after the vacuum, and the second is the weight of the soil after the groundwater level drops from the floating bulk density to the wet bulk density. The load, the third is the load that the sand cushion and the piled load transfer to the depth of the soil.

Observation of lateral displacement of embankment on soft foundation This project adopts CX-I type inclinometer to observe lateral displacement of roadbed. The results show that the inclinometer is obviously superior to other observation methods, especially the traditional buried displacement pile method. The traditional concrete displacement piles have limited length (usually about 2m), so the surface displacement of the soil can only be observed; the depth of the inclinometer can be adjusted according to the design requirements, so it can be the level of the soil from the surface layer to the deep layer. Displacement is observed. We all know that the stable destruction of soil does not start from the surface of the soil, so the inclinometer can provide accurate data for the construction of the embankment in a timely manner. The only regret is that the cost of the inclinometer is greater than the displacement of the inclinometer. The cost is too high.

The application of vacuum combined surcharge preloading drainage consolidation method in highway soft foundation treatment was successful. It broadened the application field of vacuum preloading, developed the soft foundation treatment theory, shortened the construction time, and achieved good results. Economic benefits. However, there are still many empirical parameter issues in soft-base processing, and people in the engineering community are still required to continue efforts to solve them.

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