以此为基础，结合空心圆柱仪的加载特点，给出了室内模拟主应力轴旋转的加载方法。
On the base of loading properties of hollow cylinder apparatus, loading method to simulating the principal stress axes rotation in laboratory tests is given.
震前主应力轴的旋转。
主应力轴正向旋转较逆向旋转产生的孔压小；
The pore water pressure under positive rotation of principal stress axes is smaller than that under inverse rotation.
主应力轴正向旋转较逆向旋转产生的孔压小；
The pore water pressure under positive rotation of principal stress axes is smaller than that under inverse rotation.
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