Strength behaviour of sandstone subjected to polyaxial state of stress

Rukhaiyar Saurav; Samadhiya Narendra Kumar

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Strength behaviour of sandstone subjected to polyaxial state of stress

机译：多轴应力状态下砂岩的强度行为

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The paper presents an experimental investigation on the strength behaviour of natural rock subjected to polyaxial state of stress. The polyaxial tests were conducted on cubical specimens of sandstone obtained from the Shivpuri district in Madhya Pradesh state of India. The specimens having nominal dimensions of 100 mm _ 100 mm _ 100 mm were tested using a polyaxial testing machine. Twenty-five combinations of intermediate and minor principal stresses were applied and the specimens were loaded till failure occurs. It was observed that the intermediate principal stress has a substantial effect on the strength of the Shivpuri sandstone. A database of rock strength under various combinations of r2 and r3 was obtained for the Shivpuri sandstone. The database was used to study the predictability of five most commonly used strength criterion. Root mean square error (RMSE), average absolute relative error percentage (AAREP) and coefficient of accordance (COA) were used as indices for the measure of goodness of fit. It was observed that the least error in the prediction was shown by modified Mohr Coulomb criterion followed by modified Weibols and Cook criterion. A probability analysis of the error in prediction was also done.

机译：本文对天然岩石在多轴应力状态下的强度行为进行了实验研究。多轴测试是对从印度中央邦Shivpuri地区获得的立方砂岩标本进行的。使用多轴测试机测试标称尺寸为100毫米_ 100毫米_ 100毫米的样品。施加了25种中等和次要主应力组合，并加载了试样直至失效。可以看出，中间主应力对Shivpuri砂岩的强度有很大影响。获得了Shivpuri砂岩在r2和r3各种组合下的岩石强度数据库。该数据库用于研究五个最常用强度标准的可预测性。均方根误差（RMSE），平均绝对相对误差百分比（AAREP）和依从系数（COA）被用作衡量拟合优度的指标。观察到，预测中的最小误差由修改的Mohr Coulomb准则，修改的Weibols和Cook准则显示。还对预测误差进行了概率分析。

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来源
《矿业科学技术学报：英文版》 |2017年第006期|P.889-897|共9页
作者
Rukhaiyar Saurav; Samadhiya Narendra Kumar;
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作者单位

[1]Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India;

[1]Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India;

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 CHI
中图分类矿业工程;
关键词
Polyaxial testing; Sandstone; Strength criterion; Modified Mohr-Coulomb criterion; Modified Weibols and Cook criterion;

机译：多轴试验;砂岩;强度准则;修正的Mohr-Coulomb准则;修正的Weibols和Cook准则;

Strength behaviour of sandstone subjected to polyaxial state of stress

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