中文摘要：

随着石材开采和切割技术的发展，建筑砌筑条石正从传统手工粗细料石逐步向机器切割条石过渡。机器切割条石砌筑石墙灰缝界面性能与传统石墙灰缝存在较大差异，开展其灰缝抗剪性能研究是机器切割条石砌筑石墙推广应用的关键。该文通过15片新型机器切割条石无垫片砌筑石墙灰缝双剪试验，研究这种新型石墙灰缝的抗剪性能。主要的研究参数包括砌筑灰浆强度、压应力水平和界面处理方式。根据试验结果，分析各因素对灰缝的受力特点、破坏模式、界面抗剪强度和变形性能的影响，同时基于正交试验分析各因素对灰缝抗剪性能的影响程度。研究结果表明：新型机器切割条石砌筑石墙灰缝的破坏呈现脆性破坏，灰缝开裂即达最大承载力，同时灰缝迅速滑移；各研究参数对灰缝抗剪性能的影响程度依次为界面处理方式、压应力水平和灰浆强度。通过对试验数据的统计回归，提出机器切割条石砌筑石墙灰缝的抗剪强度计算公式，计算结果和试验值吻合程度较好，可以用于工程设计和实践。

英文摘要：

With the development of stone mining and cutting technology, the construction-used stone masonry blocks have been changing from traditional stone blocks to modern machine-cutting stone blocks. There exists a distinct difference of interracial performance on the bed joint between these two kinds of stone masonry walls. Double shear test of fifteen machine-cutting stone walls was carried out to investigate the shear performance of the bed joint. The main test parameters are mortar strength, compressive stress level and interface processing methods. The stress characteristics, failure modes and shear strength of the bed joints were investigated base on the test result. Orthogonal test was also used to study the influence of different parameters to the shear performance of specimens. Test results indicated that the failure mode of the bed joint is brittle shear one. The maximum shear strength was reached once cracks along the bed joint appeared and slip was followed immediately The interface processing methods shows the most influenced degree on the shear performance of specimens while the mortar strength shows the least. A calculation formula of shear strength for machine-cutting stone walls was proposed based on statistical analysis of the test results and the calculation results show a good agreement with the test data. This paper can be referenced for engineering practice of stone masonry structures.