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割孔抗剪抗拉性能及破岩效果影响分析

Analysis of the influence of shear-tensile resistance and rock-breaking effect of cutting holes.

作者信息

Wan Antong, Tao Tiejun, Tian Xingchao, Xie Caijin, Liu Xia, Zhao Zhenhua, Zhang Houying

机构信息

College of Civil Engineering, Guizhou University, Guiyang, 550025, China.

College of Mining, Guizhou University, Guiyang, 550025, China.

出版信息

Sci Rep. 2024 Feb 28;14(1):4917. doi: 10.1038/s41598-024-55640-2.

DOI:10.1038/s41598-024-55640-2
PMID:38418928
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10901877/
Abstract

In the process of drilling and blasting construction of large-cross-section tunnels, the layout of wedge-shaped cutting holes has a great influence on the effect of blasting. In this study, theoretical analysis and numerical simulation were used to assess the effect of different forms of cutting hole placement on blasting effectiveness. First, the fissure-inducing angle was proposed, a three-dimensional model of wedge-shaped cutting considering the effect of shear-tensile resistance was established, and theoretical analyses of cutting holes with different cutting angles and fissure-inducing angles were carried out. Second, the parameters of the Riedel-Hiermaier-Thoma model were determined based on the experimental data, and verified. Third, three-dimensional numerical models were established, and analyze the influence of different forms of hole deployment on the blasting effect from the perspective of stress wave propagation and dynamic damage to the surrounding rock. Finally, based on the theoretical analysis and numerical simulation results, the wedge-shaped hollowing holes were re-designed, and 20 tunnel blasting tests were carried out using this deployment method for large-section tunnel blasting, which verified the feasibility of this deployment method. The results of the study show that for level III surrounding rock, the angle of wedge-shaped cutting holes should meet 68° ≤ θ ≤ 70° and 70° ≤ β ≤ 72°. This study provides a kind of refined and efficient blasting for the drilling and blasting excavation process of large section tunnels.

摘要

在大断面隧道钻爆施工过程中，楔形掏槽孔的布置对爆破效果有很大影响。本研究采用理论分析和数值模拟方法，评估不同形式掏槽孔布置对爆破效果的影响。首先，提出诱导裂隙角，建立考虑抗剪抗拉作用的楔形掏槽三维模型，并对不同掏槽角和诱导裂隙角的掏槽孔进行理论分析。其次，根据试验数据确定里德尔-希尔迈尔-托马模型参数并进行验证。再次，建立三维数值模型，从应力波传播和围岩动态损伤角度分析不同形式炮孔布置对爆破效果的影响。最后，基于理论分析和数值模拟结果，对楔形空孔进行重新设计，并采用该布置方法进行了20次大断面隧道爆破试验，验证了该布置方法的可行性。研究结果表明，对于Ⅲ级围岩，楔形掏槽孔角度应满足68°≤θ≤70°且70°≤β≤72°。本研究为大断面隧道钻爆开挖过程提供了一种精细化高效爆破方法。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2120/10901877/3eae5819bee5/41598_2024_55640_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2120/10901877/697b5019c84a/41598_2024_55640_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2120/10901877/1e7db5005944/41598_2024_55640_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2120/10901877/c1a6d7cb22d0/41598_2024_55640_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2120/10901877/ffd8786c51c6/41598_2024_55640_Fig12_HTML.jpg
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