击实土单轴抗拉强度试验研究

黏性土体内的裂缝产生与其抗拉强度有关.在分析土石坝心墙水力劈裂、地基裂缝等问题时,考虑抗拉强度对深入研究土体应力变形特性有重要意义.对3种不同土料的击实试样进行了抗拉强度试验,其中,1种土料为塑性相对较高的黏土,另2种为砾质黏土.通过试验,研究了各种土料在不同击实功、试样由非饱和变化到饱和状态、不同制样含水率时的抗拉强度.结果表明,黏性土的抗拉强度随着击实功的增大而增大;试样由非饱和变化到饱和状态后,其抗拉强度大幅降低;在同一击实功下,土体的抗拉强度随着制样含水率的增加而减小.

Experimental study on unaxial tensile strength of compacted soils

The cracks in cohesive soil are related to its tensile strength,therefore the consideration of tensile strength in analysis of hydraulic fracturing and foundation cracking of core walls of earth rockfill dams is of important significance to the overall research of stress deformation characteristics of soil body.Tensile strength tests were performed on three compacted soil specimens,one being the clay with relatively high plasticity,and the others being the gravel clay.The study of the tensile strength of the specimens under different compaction work and different moisture contents from unsaturated state to saturated state shows that the tensile strength of the specimens increases with the increase of compaction work,but decreases obviously as the specimens turn from the unsaturated state to the saturated state,and that the tensile strength of the specimens increases with the decrease of the moisture content under the same compaction work.