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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >An experimental approach to determine the hole-pressure under expansion load
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An experimental approach to determine the hole-pressure under expansion load

机译：确定膨胀载荷下孔压的实验方法

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摘要

Applying non-explosive expansion material (NEEM) is one of the safest methods for rock fracturing, especially in a hard rock quarry. An experimental study was conducted to determine the pressure exerted by NEEM in a hole, which is necessary for analysing rock fracturing, particularly in a numerical modelling. Stress distribution was developed in a thick-wall cylinder in order to measure the tangential strain on the external boundary. In the experiments, nine pipes of different materials and varying diameters were selected and then loaded internally with a general type of NEEM. Through electrical strain gauges, the tangential strains were recorded on the external boundary of the pipes. The results obtained from these tests and existing data from previous researchers were utilized for the statistical analysis. A new experimentally-derived formula is proposed for determining the pressure exerted by NEEM by multiple parameter regression with a high correlation coefficient. The proposed model has a nonlinear form with three independent parameters i.e. the hole diameter, the time, and the modulus of elasticity of the material.
机译：使用非爆炸性膨胀材料（NEEM）是最安全的岩石压裂方法之一，尤其是在硬石采石场中。进行了一项实验研究，以确定NEEM在孔中施加的压力，这对于分析岩石压裂是必要的，尤其是在数值建模中。为了测量外边界的切向应变，在厚壁圆柱体中产生了应力分布。在实验中，选择了九种不同材料和不同直径的管道，然后在内部装载通用类型的NEEM。通过电应变仪，切向应变被记录在管道的外边界上。从这些测试获得的结果和以前研究人员的现有数据被用于统计分析。提出了一种新的实验推导公式，用于通过高相关系数的多参数回归确定NEEM施加的压力。所提出的模型具有非线性形式，具有三个独立的参数，即孔的直径，时间和材料的弹性模量。

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