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平面应变仪是一种开发较早但至今尚不完善的一种土工试验仪器,随着国家基础设施建设的发展,平面应变试验及试验方法在许多领域得以应用,显示出了平面应变试验在工程设计和研究中的重要性。通过回顾国内外平面应变仪的发展,提出了开发一种新型的土工平面应变三轴仪的思路,以实现更科学、更精确地进行复杂应力加载条件下土平面应变试验的研究。以此为目的,从压力室结构、加载系统及控制量测系统等方面提出了相应的改善措施,开发了一种新型的土工平面三轴仪。并通过重塑黄土的平面应变试验及改进的真三轴仪平面应变试验对比、以及平面应变试验强度参数与常规三轴试验强度参数对比分析,验证了所研制的新型卧式土工平面应变仪的合理性和研制思路的正确性。最后,通过对该平面应变仪应变试验的黄土破坏特性与改进真三轴平面应变试验的黄土破坏特征的对比分析,验证了本文所开发的平面应变仪在描述土体应变局部化问题的合理性。
Plane strain gauge is a kind of geotechnical test instrument developed earlier but still not yet perfect. With the development of national infrastructure construction, the plane strain test and the test method are applied in many fields, showing the application of the plane strain test in engineering The importance of design and research. By reviewing the development of plane strain gauges at home and abroad, a new idea of developing a geotechnical plane strain triaxial apparatus is put forward to realize a more scientific and accurate study of soil plane strain test under complicated stress loading conditions. For this purpose, some corresponding improvement measures are put forward, such as pressure chamber structure, loading system and control measuring system, and a new type of geotechnical plane triaxial apparatus is developed. By comparing the plane strain test of reconstructed loess with the improved true triaxial plane strain test and the comparative analysis of the plane strain test strength parameters and the conventional triaxial test strength parameters, the new horizontal plane strain gauge The rationality and the correctness of research ideas. Finally, the comparison between the failure characteristics of loess and the failure characteristics of loess which is used to improve the true three-axis plane strain test is validated by the plane strain gauge strain test, which verifies the rationality of the plane strain gauge developed in this paper in describing the strain localization of soil .