Application of modified Goodman contact element in numerical analysis

The Goodman element is widely used to simulate the contact of two different materials, however sometimes it causes large error in stress calculation and element embedding. In this paper, a further modified contact element is proposed, the better element has its own thickness, furthermore, when composed, the element normal connecting form is adopted as the changing mode associated with normal displacement: countless springs would be used as connection when normal displacement is less than thickness, or countless rigid connecting rods would be used. Meanwhile, by comparing the calculation results of horizontal displacement of an actual cutoff wall project using the two different methods with the actual measurement values, the new element has smaller error and is proved to be superior to the exiting Goodman element.