Investigation into grouting reinforcement mechanism of fractured rock mass basedon Hoek-Brown criterion

ZHENG Zhuo; LIU Ren-tai; LI Shu-cai; WANG Xiao-chen; ZHANG Lian-zhen; WANG Hong-bo

doi:10.16285/j.rsm.2017.S1.051

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Investigation into grouting reinforcement mechanism of fractured rock mass basedon Hoek-Brown criterion

更新时间：2026-06-25

- Investigation into grouting reinforcement mechanism of fractured rock mass basedon Hoek-Brown criterion
- Vol. 38, Issue S1, Pages: 409-417(2017)
- 作者机构：
  
  山东大学岩土与结构工程研究中心,山东,济南,250061
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.S1.051
  CLC： TU452
- Online First：05 June 2018，
  
  Published：2017
- 稿件说明：
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ZHENG Zhuo, LIU Ren-tai, LI Shu-cai, et al. Investigation into grouting reinforcement mechanism of fractured rock mass basedon Hoek-Brown criterion[J]. 2017, 38(S1): 409-417.
DOI：

ZHENG Zhuo, LIU Ren-tai, LI Shu-cai, et al. Investigation into grouting reinforcement mechanism of fractured rock mass basedon Hoek-Brown criterion[J]. 2017, 38(S1): 409-417. DOI： 10.16285/j.rsm.2017.S1.051.

摘要

采用离散裂隙网络（DFN）建立裂隙岩体模型，通过计算推导获得裂隙频率与Hoek-Brown经验参数的对应关系。借助离散元颗粒流程序PFC，计算分析了注浆加固前后岩体强度的各向异性程度以及沿不同方向和不同注浆黏聚力条件下的应力–应变曲线。在对Hoek-Brown经验参数物理意义分析的基础上，拟合注浆加固后的岩体强度曲线，并分析了注浆黏聚作用的影响规律。研究表明，注浆加固后抗压强度大幅提高，各向异性程度明显降低，其力学特性由延性逐渐转变为脆性。围压较低时，按照Hoek-Brown准则与文中模型计算的抗压强度存在一定差别，随着围压的增加，其误差逐渐减小。依据JCond与Hoek-Brown参数间的定量关系，获得了注浆加固对岩体强度的作用规律，其中参数s受注浆加固影响更加明显。由于mb主要反映了岩体本身的强度性质，s反映岩体的破碎程度，注浆作用的体现与参数的物理意义相互吻合，证明了文中计算模型的合理性。

Abstract

A fractured rock model is established with discrete fracture network(DFN); and then the relationship between fracture frequency and the Hoek-Brown parameters is deduced. By using the particle flow code

the anisotropy of rock mass strength before and after grouting is calculated; and the stress-strain curve is acquired along different directions and with different cohesive forces. With analyzing the physical meaning of the Hoek-Brown parameters

rock mass strength curve after grouting is fitted; and the influencing rule of grouting effect is analyzed. Results show that

after grouting

the compressive strength is improved significantly and the anisotropic property is decreased. The mechanical property of the rock mass changed from ductile to brittle. When the confining force is low

the compressive strength calculated from the model is different from that of the Hoek-Brown criterion; and the difference decreases when confining force increase. Based on the quantitative relationship between JCond and the Hoek-Brown parameters

the influencing law of grouting reinforcement on rock mass strength is acquired. The parameters is influenced to a larger extent by grouting effect. Since the parameter mb represents the own strength property of rock mass

while s represents the broken degree

the performance of grouting effect and the physical meaning match with each other

which proves the rationality of this model.

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