Elastic-plastic solution and experimental study on critical water pressure inducing hydraulic fracturing in soil

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• 作者：Jun-gao Zhu 朱俊驿/a> ; En-yue Ji 吉恩赿/a> ; Yan-feng Wen 温彦钿/a>…
• 刊名：Journal of Central South University
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：22
• 期：11
• 页码：4347-4354
• 全文大小：590 KB
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• 作者单位：Jun-gao Zhu 朱俊高 (1) (2)
  En-yue Ji 吉恩跃 (1) (2)
  Yan-feng Wen 温彦锋 (3)
  Hui Zhang 张辉 (4)
  
  1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, China
  2. Geotechnical Institute of Hohai University, Nanjing, 210098, China
  3. Department of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China
  4. Shanghai Jianke Engineering Consulting, Co., Ltd, Shanghai, 200032, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Central South University, co-published with Springer
• ISSN：2227-5223

文摘

It is widely believed that hydraulic fracturing will occur in the clay core of an earth-rockfill dam if the water pressure in the core increases to levels that are high enough to allow a fracture to form. An elastic-plastic solution to critical water pressure inducing hydraulic fracturing (fracture initiation pressure) in soil is derived based on Mohr-Coulomb shear failure criterion and the theory of cavity expansion. In order to verify the applicability of the criteria presented and study the relations among fracture initiation pressure, tensile strength and stress state of soil, laboratory tests are performed on compacted cuboid specimens by true triaxial apparatus. According to the test results, the cracks of hydraulic fracturing existed perpendicular to the minor principal stress plane. The hydraulic fracturing pressure p _f increases with the increase of dry density of specimen, p _f shows good linear relationship with σ ₂ and σ ₃. The prediction from presented equation is compared with test results and other three predictions, of which two are tensile failure (TS) criterion, and the other is Mohr-Coulomb (M-C) criterion. The presented solution is verified, and the other three approaches for p _f are evaluated. The comparison indicates that the predicted values from the presented equations agree well with the test values for specimens of low dry density, and the error of the prediction is larger for those of high dry density, especially in lower minor stress states. The predicted average relative error of absolute value R _a from TS1 criterion is 13.3% for all specimens of different dry densities, and each prediction is lower than the test data. On the contrary, most of the predicted values from M-C criterion are greater than the test data, but the average relative error from the presented equation is the minimum. Considering the safety of soil works, an equation from TS1 criterion is suggested to evaluate the occurrence of hydraulic fracturing in earth-rockfill dam designing.