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。

To explore the effects of rock block proportion (RBP) and the shape on the mechanical properties of cemented soil-rock mixture (CSRM) that widely exists in nature, a series of large scale triaxial tests is conducted in laboratory. Firstly, specimens of soil-rock mixture mixed with cement and without cement are compared to demonstrate that soil-rock mixture is necessary to be further divided into CSRM and uncemented soil-rock mixture. Then, contrast tests are designed and performed on CSRM specimens with different RBPs and rock block shapes. Finally, the effects of RBP and shape on the mechanical properties of CSRM are analyzed. The results indicate that CSRM specimens with 3% cement exhibit evident strain softening band and localized shear band, whose strength and modulus are greatly increased compared with those of specimen without cement. Under given conditions, peak strength and brittleness index both decrease with increasing RBP. With 40% RBP, the peak strength of CSRM specimen with gravel blocks is slightly lower than that of CSRM specimen with pebble blocks; while the residual strength is slightly greater. With 70% RBP, no matter the peak strength or the residual strength of CSRM specimen with gravel blocks is greater than those of CSRM specimen with pebble blocks, especially under higher confining pressure.