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在含硬包体的混凝土试样、双轴加压的破裂孕育过程中，观测自由面的应变场。随着应力增加，高应变区逐步形成，应变梯度增大。主破裂前，有的高应变区应变量与应变梯度均减小，有的则增加。主破裂发生在应变及其梯度相对都较低的一个高应变梯度区。应变场区内不同测点，其应变随应力及时间的变化而形态不同。临破裂前，距破裂带和包体近的测点应变图像复杂；有的反向加速增大，有的同向加速增大，有的显著减小；而远处测点，变化迟缓且不太明显。
In the hard inclusions of concrete specimens, biaxial compression rupture during pregnancy, the observed free surface strain field. As the stress increases, the high strain zone gradually forms and the strain gradient increases. Before the main rupture, some of the high strain area strain and strain gradient decreased, while others increased. The main rupture occurs in a zone of high strain gradient where the strain and its gradient are relatively low. Strain field different measuring points, the strain changes with stress and time and different forms. Prior to rupture, the strain images at the measuring point near the rupture zone and the inclusions are complex; some of the accelerating accelerations increase, some increase in the same direction, and some decrease significantly; while the measuring points in the far distance change slowly and not Too obvious.