Abstract
The bearing capacity of soft clay foundations is low, which easily causes excessive cumulative and uneven settlement of the substation. This will seriously threaten the safe operation of equipment in the substation. Based on a 220‐kV substation project in a coastal soft clay ground, the settlement of the substation building is monitored on the spot, and the settlement law of soft clay ground is analyzed. Furthermore, a three‐dimensional finite element model is developed using finite element software named ZSOIL.PC. A numerical model for predicting the settlement of soft clay ground in a substation is proposed using the appropriate element type, material constitutive model, and calculation parameters. The rationality of the numerical method is validated by comparison with the measured data. After improving the soft clay ground with the cement‐soil deep mixing method, there are still certain degrees of cumulative and differential settlements in the substation distribution device building, but both are within the specification requirements. The settlement of the soft soil ground in the substation increases with time, but the growth rate gradually decreases and ultimately tends to stabilize after a certain period of time, ensuring the uniformity of foundation treatment is the key to controlling the differential settlement. The research results can provide a reference for the subsequent installation and construction of electrical equipment and the design of substation engineering in soft soil ground.
Highlights
As an important place to transform and transmit electric energy in the power grid, the substation is the core and link of the entire power grid system and is very important for the safe and stable operation of the power system
Based on the finite element software ZSOIL.PC, a three-dimensional finite element model was developed to predict the long-term cumulative settlement of substation buildings. e numerical model for predicting settlement was validated by comparison with the measured data. e research results can provide a reference for the engineering design of substation projects in soft soil grounds
Settlement observations of substations on soft clay foundations are carried out, and numerical simulations are performed to predict the settlement of substation foundations using the three-dimensional geological engineering software ZSOIL.PC. e law of foundation settlement is analyzed, and the following main conclusions are obtained as follows: (1) For the two power distribution buildings, the cement-soil deep mixing method is adopted to improve the soft soil ground in strict accordance with relevant specifications
Summary
As an important place to transform and transmit electric energy in the power grid, the substation is the core and link of the entire power grid system and is very important for the safe and stable operation of the power system. A large number of studies have explored the problem of settlement of soft clay foundations, and many methods have been proposed to calculate the settlement of foundations. Zhang [15] proposed a method of calculating the settlement of soft clay considering the effect of structural characteristics based on laboratory and in situ test data. Shi et al [16] analyzed the settlement of an embankment on a soft foundation using the finite element method when considering the rheology and damage of the structural soil based on a soil elastoplastic model. There have been relatively few studies on the settlement deformation law of substations on coastal soft soil foundations, and there is a lack of appropriate numerical methods to predict the settlement. Based on the finite element software ZSOIL.PC, a three-dimensional finite element model was developed to predict the long-term cumulative settlement of substation buildings. e numerical model for predicting settlement was validated by comparison with the measured data. e research results can provide a reference for the engineering design of substation projects in soft soil grounds
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