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为研究土石混合体在含超径颗粒情况下的力学响应,利用大型三轴剪切试验仪,分别对体积含石量为25%,35%的非常规土石混合体试样在3种不同围压条件下进行固结不排水剪切试验。试验结果显示:含超径颗粒土石混合体在不排水剪切条件下仍然存在体积变化;含石量35%的土石混合体在围压较高情况下,体应变表现为加载初期剪缩,随后剪胀,二次剪缩,再次剪胀的特征;含石量25%的土石混合体的应力–应变曲线较为平滑,但含石量在35%的情况下,应力–应变曲线则呈现锯齿状特征,且伴随着间接性的应力跳跃现象,相应的体应变、孔隙水压力也出现跳跃现象,且与试样的应力变化具有很好的对应关系。
In order to study the mechanical response of soil-rock mixture under the condition of containing over-size particles, a large-scale triaxial shear tester was used to measure the mechanical properties of unconventional earth-rock samples with volume of 25% and 35% Unconsolidated shear tests were carried out under pressure conditions. The results show that there is still volume change under the condition of undrained shear with the mixture of over-diameter granular soil and stone; under the condition of high confining pressure, the volumetric change of the soil-rock mixture containing 35% Dilatancy, secondary shrinkage and dilatancy again. The stress-strain curve of rock-soil mixture with 25% stone content is smoother, but the stress-strain curve shows jagged when the content of rock is 35% Characteristics, and accompanied by indirect stress jump phenomenon, the corresponding body strain, pore water pressure also jump phenomenon, and with the sample stress changes have a good correspondence.