One of them is the k-q model, called the “Uzan-Witczak model”, which describes the resilient modulus, characteristic for varying confining pressure.

【翻译】其中之一是k-q模型，称为“UZAN-Witczak模型”，此模型描述了具有不同围压变化特征的回弹模量。

characteristic for varying confining pressure，是形容词短语作定语，修饰the resilient modulus，意为“具有某种特征的某事物”。characteristic 之前的逗号是多余的，删去。