计算中岩体采用DP模型，利用面面接触单元考虑岩体与结构交界面的状态非线性。
In the calculation, the DP model is chosen to consider the non-linearity of rock and the status non-linearity of rock-structure interface adopts the surface-surface contacting element.
该模型土层定义为弹性，以面面接触对模拟桩土接触面，温度荷载模拟土层对桩的侧压力。
The face-face contact pair is used to simulate the pile soil contact face, and the temperature load is used to simulate the side pressure of soil layer to the pile.
我很清楚，接触面面积会在撞击过程中发生改变——所以我要试着估算出它的具体值。
I know this area should actually change during the collision -so I am just going to estimate it.
填料为被动元件，用于提高气液接触界面面积。
Packings are passive devices that are designed to increase the interfacial area for vapour-liquid contact.
水泥混凝土路面面层与贫混凝土基层界面的接触状况，不仅直接影响到路面的接缝间距，同时也对路面的荷载应力有较大影响。
The contact condition between PCC surface layer and poor cement concrete base course directly influences the space between joints and the loading stresses in the pavement.
水泥混凝土路面面层与贫混凝土基层界面的接触状况，不仅直接影响到路面的接缝间距，同时也对路面的荷载应力有较大影响。
The contact condition between PCC surface layer and poor cement concrete base course directly influences the space between joints and the loading stresses in the pavement.
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