Design And Field Test Of Vacuum And Load-bearing

With the coast of Zhejiang's social and economic development in the growing, the demand for electricity has become an increasingly pressing, such as the electricity substation construction project on the rise. Zhejiang's coastal areas due to poor soil conditions, the distribution of a wide range of deep soft soil, mainly mud and silt soil, the soil has a high water content, poor permeability, low strength, porosity, low-density and a certain amount of structural Its distribution is often uneven and low-lying, need to fill a large area, the substation to the ground treatment has brought more difficulties. There are many ways to deal with the current soft ground, pre-vacuum pressure is weak foundation to deal with one of the more effective way, as there is a vacuum preloading a joint approach in the mechanism of reinforcement, construction techniques and so on the little research. In this paper, concrete engineering practice, the joint vacuum preloading mechanism of reinforcement of soft soil, construction technology, design and on-site monitoring carried out a more in-depth analysis, the following has been beneficial to the engineering study and application of the conclusions:1. Vacuum preloaded the soil deformation resulting contraction will not occur out of the lateral and at the same time be able to offset the surcharge under generated out of the soil, improving the speed of filling, but if the loading rate over Will quickly lead to instability surcharge.2. Vacuum preloading generally applicable to non-existence of the geological section of the bottom water or homogeneous type of cohesive soil in soft soil for reinforcement of coastal Zhejiang-based soft substation. To ensure that only the drainage system, sealing systems, vacuum systems, such as normal to make a joint vacuum preloading test successfully.3. Observational data through on-site analysis, the joint use of vacuum preloading law substation soft soil reinforcement, strengthening not only better but also reinforced the depth of deep, must be able to remove the settlement after more suitable for strengthening substation sites the soft-deep.