期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 323, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.126524
关键词
Calcareous gravelly sand; Dilatancy; Phase-transition stress ratio; Failure dilatancy ratio; Relative density; Effective confining pressure
资金
- National Key Research and Development Program of China [2017YFC1500400]
- Major International (Regional) Joint Research Project [52020105002]
- China Postdoctoral Science Foundation [2020M682653, 2021T140142]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515110663]
This study conducted tests on CGS to investigate the effects of relative density and effective confining pressure on its dilatancy. An empirical dilatancy equation for calcareous sand was proposed and validated. The study also compared different dilatancy equations and found a linear relationship between dilatancy ratio and stress ratio-related parameter.
Calcareous gravelly sand (CGS) is the primary building material used in the foundation filling of island-reefs in the South China Sea. In this study, multiple consolidation-drained triaxial shear tests were conducted on CGS, in order to reveal the effects of relative density (Dr) and effective confining pressure (sigma '(3)) on the CGS dilatancy. The applicability of classical dilatancy equations to CGS was tested. An empirical dilatancy equation applicable to calcareous sand was proposed and the rationality of this dilatancy equation was validated. According to the results: (I) Phase-transition stress ratio (eta(p)) and failure dilatancy ratio (d(f)) are important indices for assessing the CGS dilatancy. Physical models were built to predict the eta(p) and d(f) of CGS based on its Dr and sigma '(3), respectively. (II) The dilatancy equation of the modified Cam-clay model could not reflect the CGS dilatancy. Rowe's dilatancy equation could reflect the CGS dilatancy to some extent, but it underestimated the CGS dilatancy when sigma '(3) = 50 kPa and overestimated the CGS dilatancy when sigma '(3) = 400 kPa. (III) A good linear relationship was identified between dilatancy ratio and stress ratio-related parameter ((eta(2)(f)-eta(2))eta(0.5)). Therefore, the empirical dilatancy equation built on this basis is highly applicable to calcareous sand.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据