原状土的抗剪强度研究

为了研究土的现场原位与室内试验抗剪强度指标的关系，根据饱和土固结理论，土的固结过程就是在某一压力作用下有效应力增大、孔隙水压力消散的过程。因此，随着有效应力增大土的孔隙比减小，而土的抗剪强度增大，土的压缩曲线与土的抗剪强度线之间有一一对应关系，从土的现场原位和室内压缩曲线出发，研究了加、卸载过程中土的抗剪强度的变化规律，然后根据土的卸载抗剪强度的计算方法推导出土的黏聚力和土的内摩擦角两者之间的相互关系，最后分析得到了原状土抗剪强度的计算方法

Study of shear strength for intact soil

The relationship between in-situ values of soil shear strength and laboratory experimental values is discussed.Based on consolidation theory of saturated soil,the consolidation of soil is the process effective stress increasing and pore water pressure dissipating under a certain pressure action.With the effective stress increasing,void ratio of soil decreases and shear strength increases.Compression curve and shear strength line have one-to-one correspondence relationship.Based on in-situ compression curves and indoor experimental curves,variation regularity of soil shear strength during loading and unloading processes is studied.Then,the relationship between cohesion and internal friction angle is derived based on the calculation method of soil unloading shear strength.Finally,the calculation method of shear strength for intact soil is obtained.