新郑门遗址土剪切及拉伸试验研究

Shear and Tensile Tests of Xinzhengmen Site Soil

土力学性能研究十分注重土体的抗压抗剪性能,而对土体的抗拉性能研究较少.遗址土作为一种人工处理的特殊土,其力学性能尤其是抗拉性能相对较高,独特的力学性能是土遗址保存至今的重要原因之一,也是土遗址研究的重点.本文对遗址土的基本物理性质进行了测定;对干湿循环后的试样进行了低应力条件下直接剪切试验,研究了干湿循环对遗址土力学性质的影响;采用改装后的单轴拉伸试验仪器及三轴拉伸仪,测试了遗址土的抗拉性能.论文的研究结果为新郑门遗址稳定评价提供了试验依据和理论基础.论文的研究方法也为抗拉性能较高的非饱和土的力学性能研究提供了借鉴.

The study of soil mechanical properties pays much attention to the compressive and shear properties of soil,while the study of the tensile properties of soil is less.As a special artificial soil,site soil has relatively high mechanical properties,especially tensile properties.The unique mechanical properties of the site soil are one of the important reasons for the preservation of the site,and also the focus of the study of the site.In this paper,the basic physical properties of site soil were tested.In this paper,direct shear tests under low stress were carried out on the specimens after dry-wet cycling,and the effects of dry-wet cycling on the mechanical properties of the site soil were studied.The tensile properties of the site soil were tested by the modified uniaxial tensile test and triaxial tensile test instrument.The results of this paper provide experimental and theoretical basis for the stability evaluation of Xinzhengmen Site,and also provide a reference for the mechanical properties of unsaturated soils with high tensile properties.