Based on the solution to a spherical cavity expansion in semi-infinite soil, an elastic solution or assessing the deflection of the diaphragm wall caused by pile driving is derived by using the elastic foundation beam theory. To determine the supporting condition of the diaphragm wall, simplifications are made to the internal support conditions of the excavation and the constraint conditions at the end of the diaphragm wall. A detailed discussion is conducted to analyze the effects of pile depth and distance between diaphragm wall and pile. The results indicate that pile driving has pronounced effects on the adjacent underground diaphragm wall, especially for the diaphragm wall under the excavation surface. With the increase of pile depth the lateral displacement of diaphragm would be gradually larger after the end of pile below the excavation surface. And when the depth of the pile is more than the depth of the diaphragm wall, the influence on the diaphragm wall will be gradually weakened. The displacement of the diaphragm wall becomes larger with the increase of the pile diameter. The closer the pile is to the diaphragm wall, the greater the displacement of the diaphragm wall is, and when the distance between the pile and the diaphragm wall reaches 15 times of the pile diameter, the effect can be ignored.
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