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胶结土石混合体在自然界中分布广泛,为了揭示块石含量和块石形状对其力学特性的影响,开展了一系列室内大三轴试验研究。首先,通过掺有一定量水泥的土石混合体试样与未掺水泥的试样进行对比,以论证土石混合体有必要进一步划分为胶结土石混合体和无胶结土石混合体。然后,针对胶结土石混合体设计并进行了不同块石含量和块石形状的对比试验。最后,对胶结土石混合体力学特性的块石含量和块石形状效应进行了分析探讨。结果表明:水泥掺入比为3%的土石混合体试样较未掺水泥的试样强度和模量均有大幅提高,有明显的应变软化和局部化剪切带;在给定条件下,胶结土石混合体的峰值强度和脆性指数均随含石量的增加而减小;当含石量为40%时,块石为碎石的胶结土石混合体试样与块石为卵石的试样相比峰值强度略低,而残余强度略高;而当含石量为70%时,无论是峰值强度还是残余强度,块石为碎石的试样均比块石为卵石的试样大,围压较大时尤为明显。
In order to reveal the influence of rock mass content and rock shape on its mechanical properties, a series of indoor triaxial tests have been carried out. First, we compared the soil-rock mixture sample with the cement-unblended sample with a certain amount of cement to prove that it is necessary to further divide the soil-rock mixture into a mixture of cemented stone and non-cemented stone. Then, for the cement-soil mixture design and comparison of different stone content and rock shape contrast test. Finally, the boulder content and stone shape effect of the mechanical properties of the cemented-earth-rock mixture are analyzed and discussed. The results show that the strength and modulus of soil-stone mixture specimens with 3% cement admixture are significantly increased compared with those without cement, and there are obvious strain softening and localized shear zones. Under the given conditions, The peak strength and brittleness index of the cemented-stone mixture decrease with the increase of the content of the stone. When the content of the ceramsite is 40%, the sample of the cemented-stone mixture with crushed stone and the pebble of the block Slightly lower than the peak intensity, while the residual strength is slightly higher; when the content of rock is 70%, both the peak intensity and the residual strength, Especially when the confining pressure is more obvious.