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针对“超高压变质岩在约 32km深处受构造挤压作用而形成”的认识 ,列举岩石学和构造地质学论据 ,指出差应力引起的构造超压受到岩石强度的限制 ,由于岩石本身力学性质、应变速率及温度的影响 ,构造超压不会超过 1GPa ,更不会引起超高压变质作用 .在计算塑性体变形或弹塑性体的塑性变形阶段的主应力值时 ,不应运用应力 应变的弹性本构方程 .
In view of the understanding that “the UHP metamorphic rocks are formed by tectonic extrusion at a depth of about 32km”, the authors hold the view of petrology and tectonic geology. It is pointed out that the tectonic overpressure caused by differential stress is limited by the rock strength. Due to the mechanical properties of rock itself , Strain rate and temperature, tectonic overpressure will not exceed 1GPa, and will not cause UHP metamorphism.When calculating the principal stress value of plastic deformation stage or plastic deformation stage, should not use the stress and strain Elastic constitutive equation.