三峡二期围堰塑性砼变形性能及影响因素的研究

Investigation on Plastic Concrete Deformation Properties and Influence Factors for TGP 2nd Stage Cofferdams Cut off Wall

对三峡二期围堰砼防渗墙的塑性砼单轴应力－应变全过程线作了分析，认为曲线的线性段表征材料工程特性，可取该段的斜率作为塑性砼单轴抗压弹模。在三轴应力条件下，研究了塑性砼极限偏差应力与围压的关系、偏差应力与轴向应变的关系、轴向应变与侧向应变的关系。提出了影响塑性砼变形性能的几个因素。

In this paper, the whole process curves of monoaxial stress strain test of plastic concrete of the TGP 2nd stage cofferdams cut off wall are analysed. It may be considered that the lineal stage of the curve represents the characteristics of the material. Thus, the slope of this line can be regarded as a monoaxial modulus of elastic compression of plastic concrete. Under triaxial stress condition, the relations between limiting deviatoric stress and circumferential stress of plastic concrete, between deviatoric stress and axial strain, and between axial deformation and lateral strain, are researched. Several factors affecting deformation characteristics of plastic concrete are introduced.