关键词: 莫尔-库仑模型, 邓肯-张模型, 模型修正

Abstract: MohrCoulomb model is a perfect elastoplastic model. It only considers the variation of material strength with lateral compressive stress, while ignoring the variation of elastic modulus with lateral compressive stress and stress level, which doesn't reflect the true characteristic of geological material. The elasticity modulus in MohrCoulomb model was modified by employing the processing method of tangential modulus in DuncanChang nonlinear model. In the modified model, the stressstrain curve in the elastic phrase behaves as hyperbola. In order to embed the modified model in FLAC3D, a preprocessing program was written and was used to analyze the traverse bearing capacity of rigid piles numerically. Because the unloading modulus in the modified model isn't defined renewedly, it only fits the case of persisting loading well.

Key words: DuncanChang model, model modification , MohrCoulomb model