土石混合料力学特性和颗粒破碎研究

Study on Static Characteristics and Particle Crushing Test of Soil-Rock Mixture

文中针对土石混合料开展了一系列的室内三轴固结不排水试验。通过对应力-应变关系曲线、强度参数以及颗粒破碎规律等方面进行分析,探讨土石混合料的力学性质与破碎特点。实验数据分析发现,含石量和相对破碎率呈正相关;围压增大,相对破碎率的破碎趋势会逐渐减缓,二者的关系符合Allometricl函数模型。此外,含石量的增加能够提高土石混合料的强度;内摩擦角随含石量的“低-中-高”具有着“慢-快-慢”的增长规律,Boltzmann函数模型能够较好地描述这一规律并具有一定的适用性;土石混合料的黏聚力在含石量较低时较大,含石量较高时黏聚力下降到一定程度后随含石量的增加缓慢增长。

Based on the indoor triaxial apparatus,the undrained consolidation tests of soil-rock mixtures with five different rock contents and three different confining pressures were carried out.By analyzing the stress-strain curve,strength parameters and particle crushing law,the mechanical properties and crushing characteristics of soil-rock mixture are discussed.The experimental data show that there is a positive correlation between the rock content and the relative fragmentation rate,and the trend of the relative fragmentation rate will gradually decrease with the increase of confining pressure,which accords with the Allometricl function model.In addition,the increase of stone content can improve the strength of soil-stone mixture,and the internal friction angle has a“slow-fast-slow”growth law with the“Low-middle-high”of stone content.The Boltzmann function model can describe this rule well and has some applicability.The cohesion of soil-rock mixture is greater when the stone content is low,and when the stone content is high,the cohesion decreases to a certain extent before slowly increasing with the increase of stone content.