One of them is the k-q model, called the “Uzan-Witczak model”, which describes the resilient modulus, characteristic for varying confining pressure.
后面的characteristic for varying confining pressure是什么成分啊，修饰的哪个，这句话整体又该如何讲解呢?
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”，此模型描述了具备不同围压变化特点的回弹模量。
characteristic for varying confining pressure，是形容词短语作定语，修饰the resilient modulus，意为“具备某种特点的某事物”。characteristic 之前的逗号是多余的，删去。