The Barcelona Basic Model (BBM) has been implemented in a finite difference-based computer program to simulate the behavior of unsaturated soils subjected to wetting. The BBM implementation was verified using analytical solutions, and the proposed model has been used to simulate the response of a compacted embankment under complete saturation and suction induced conditions. Numerical analyses indicate that considerable amount of total and differential settlements could develop at the top surface of the embankment. BBM is executed into FLAC^2D extending a defined module for modified Cam Clay (MCC) and has been set up an analytical solution for suction-dependent stress and strain. Evaluating the effect of anisotropy and nonlinear apparent tensile strength in unsaturated soils, a modification to BBM formulation has been proposed and optimized by developing numerical analyses to reduce the size of elastic region of loading collapse (LC) curve. Then, an experimental study in the literature is investigated by utilizing comparative curves from BBM and modified BBM indicating well agreement with natural circumstances. As a result of the work presented in this research, finite difference codes with BBM and modified BBM has the capability of simulating the real behavior and is operational being applied to problems associated with earthen structures in unsaturated or partially saturated of expansive soils as a three-phases medium.

巴塞罗那基本模型 (BBM) 已在基于有限差分的计算机程序中实现，以模拟受润湿的非饱和土壤的行为。使用解析解验证了 BBM 的实施，并且所提出的模型已用于模拟压实路堤在完全饱和和吸力诱导条件下的响应。数值分析表明，在路堤的顶面可能会形成大量的总沉降和差异沉降。BBM 被执行到FLAC ^2D扩展了用于改良凸轮粘土 (MCC) 的定义模块，并已为依赖于吸力的应力和应变建立了解析解。评估非饱和土中各向异性和非线性表观抗拉强度的影响，提出了对 BBM 公式的修改，并通过开发数值分析来优化，以减小加载坍塌 (LC) 曲线的弹性区域的大小。然后，利用 BBM 和修改后的 BBM 的比较曲线研究了文献中的实验研究，这些曲线表明与自然环境的一致性很好。由于本研究中提出的工作，