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以福州软件园的花岗岩残积土为研究对象,通过SDJ-I型三速电动等应变直剪仪器展开直剪试验。研究当试样的含水条件和干密度条件改变时,花岗岩残积土的抗剪强度参数变化规律。由试验结果可知:当干密度维持恒定,而含水率相对偏小时,黏聚力、内摩擦角和含水率之间呈正相关关系。当含水率超过某一临界值时,二者之间的关系变为负相关关系,该临界值和最优含水率的差异很小。在含水率保持不变的情况下,黏聚力、内摩擦角和干密度之间呈正相关关系,符合线性变化趋势。试验所得的成果对福州地区的设计与勘察工作具有实用价值。
Taking the granite residual soil of Fuzhou Software Park as the research object, the direct shear test was carried out by the SDJ-I type three-speed electric straight-strain strain-shear apparatus. The variation of shear strength parameters of granite residual soil was studied when the conditions of water content and dry density of the sample were changed. The test results show that: when the dry density remains constant, while the moisture content is relatively small, there is a positive correlation between cohesion, internal friction angle and water content. When the moisture content exceeds a certain critical value, the relationship between the two becomes a negative correlation, and the difference between the critical value and the optimal moisture content is small. Under the same moisture content, there is a positive correlation between cohesion, internal friction angle and dry density, which accords with the linear trend. The results of the experiment have practical value for the design and survey work in Fuzhou area.