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Trang 6well as avoid affecting the surrounding areas Deeply studying how to determine the calculation model and its input parameters is an important issue and determines the stability of the excavation
At present, the majority of excavation design units only carry out the design step without the process of checking the calculated displacement data to see if it is similar to reality This leads to a lot of waste in the cost of construction methods, in particular, the calculated displacement value is much larger than the actual displacement value Therefore, in order for the excavation problem to behave as closely as possible to reality, it is necessary to back analysis the calculation model after construction, thereby creating a theory to calculating excavations of similar geology
Back analysis the excavation model is a method to calculate and iteratively run the input parameters of the model to get the calculated value that approximates the actual displacement value In addition, many studies show that the displacement value of the model almost depends
on the analytical model and the soil's modulus coefficient, so the thesis will focus on this issue to determine the properly input parameters to avoid waste for construction method
Besides that, the corner effect of the diaphragm wall also significantly reduces the displacement of the diaphgram, this thesis will analyze this problem based on the calculation results of the 3D excavation model, the graph to calculate Plain Strain Ratio (PSR) base on the research of Ou et al [1] From there, it is possible to accurately calculate the displacement of the corner points of the excavation with 2D software in geological conditions in District 1, Ho Chi Minh City without taking too much time to model the excavation with 3D software
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