Abstract
In underground engineering such as tunnel engineering, the condition of surrounding rock such as water-containing jointed rock mass is a common engineering geology. For broken, water-containing surrounding rock, the reasonable measures to prevent and drain water has always been a key issue. Based on the statistical information of the structural surface of the surrounding rock of the Hongtuzhang tunnel, DIPS software was used to classify the structural plane of the tunnel. Based on the statistical analysis of the occurrence, size, and density of the structural plane, the two-dimensional structural plane network model of the rock mass was established, and the permeability tensor (K1 = 1.61 × 10−6 m/s, K2 = 5.78 × 10−7 m/s) was calculated. Consider the worst orientation, the permeability tensor (K1 = 1.61 × 10−6 m/s) was selected to calculate the grouting design. Based on the theory of limited discharge, the influence of parameters of permeability coefficient ratio n and thickness of grouting layer Tg on the tunnel water inflow and lining external water pressure was analyzed. The recommended value of tunnel drainage was 3.0 m3/m∙d, then the corresponding grouting circle parameters were put forward (permeability coefficient ratio n = 100, thickness of grouting layer Tg = 8 m).
Highlights
Published: 4 January 2022The jointed rock mass is composed of rock blocks and fractures
The seepage of jointed rock mass has the following characteristics [1,2,3]: Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
This paper carries out discrete fracture network modeling on the measured data of the rock mass structure of the Hongtuzhang tunnel, discusses the anisotropy of the fractured rock mass based on fracture hydraulics, and determines the permeability tensor of the fractured rock mass; Investigation on the effect of the limited discharge grouting layer of the Hongtuzhang tunnel on the water-bearing fractured rock mass and lining structure is important, and to propose the parameters of the limited discharge grouting circle has important theoretical and practical application significance for the construction of the Hongtuzhang tunnel
Summary
The jointed rock mass is composed of rock blocks and fractures. There are obvious differences in the water conductivity of these two media. It is relatively rare to combine the seepage flow of fractured rock mass with the waterproof characteristics and drainage of tunnel engineering for water-rich broken surrounding rock to determine a reasonable grouting method. This paper carries out discrete fracture network modeling on the measured data of the rock mass structure of the Hongtuzhang tunnel, discusses the anisotropy of the fractured rock mass based on fracture hydraulics, and determines the permeability tensor of the fractured rock mass; Investigation on the effect of the limited discharge grouting layer of the Hongtuzhang tunnel on the water-bearing fractured rock mass and lining structure is important, and to propose the parameters of the limited discharge grouting circle has important theoretical and practical application significance for the construction of the Hongtuzhang tunnel
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