Strength Assessment of Broken Rock Postgrouting Reinforcement Based on Initial Broken Rock Quality and Grouting Quality
 作者： Hongfa Xu,  Hansheng Geng,  Feng Chen,  Xiao Chen,  Liangliang Qi,  Francesco Pesavento 作者单位： 1State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing, Jiangsu 210007, China2Nanjing Army Command College, Nanjing, Jiangsu 210045, China 刊名： Mathematical Problems in Engineering, 2017, Vol.2017 来源数据库： Hindawi Journal DOI： 10.1155/2017/3651765 原始语种摘要： To estimate postgrouting rock mass strength growth is important for engineering design. In this paper, using self-developed indoor pressure-grouting devices, 19 groups of test cubic blocks were made of the different water cement ratio grouting into the broken rock of three kinds of particle sizes. The shear strength parameters of each group under different conditions were tested. Then this paper presents a quantitative calculation method for predicting the strength growth of grouted broken rock. Relational equations were developed to investigate the relationship between the growth rates of uniaxial compressive strength (UCS), absolute value of uniaxial tensile strength (AUTS), internal friction angle, and cohesion for post- to pregrouting broken rock based on Mohr-Coulomb strength... criterion. From previous test data, the empirical equation between the growth rate of UCS and the ratio of the initial rock mass UCS to the grout concretion UCS has been determined. The equations of the growth rates of the internal friction coefficient and UCS for grouting broken rock with rock mass rating (RMR) and its increment have been established. The calculated results are consistent with the experimental results. These observations are important for engineered design of grouting reinforcement for broken rock mass.

• grouting　水泥灌浆
• growth　生长
• broken　破碎的
• uniaxial　单轴的
• strength　强度
• paper
• concretion　结核
• cement　胶结物
• increment　增量
• internal　内部的