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张 玉,何晖,曾志英,等. 粉煤灰-石灰改良黄土与压实黄土强度特性对比分析[J]. 科学技术与工程, 2021, 21(8): 3265-3273.
ZHANG YU,et al.Experimental research on comparative analysis of strength characteristics of fly ash-lime improved loess and compacted loess[J].Science Technology and Engineering,2021,21(8):3265-3273.
粉煤灰-石灰改良黄土与压实黄土强度特性对比分析
Experimental research on comparative analysis of strength characteristics of fly ash-lime improved loess and compacted loess
投稿时间:2020-05-26  修订日期:2020-12-16
DOI:
中文关键词:  粉煤灰-石灰  改良黄土  压实黄土  应力-应变关系  强度特性
英文关键词:Fly Ash- Lime  improved loess  compacted loess  stress-strain relation  strength characteristics
基金项目:国家自然科学基金(11802218);陕西省科技计划项目(2019JQ?432、2019JQ?835);陕西省黄土力学与工程重点实验室项目(LME201801);陕西省教育厅自然科学研究专项(2019JK?0404、2019JK?0399);西安工业大学校
                 
作者单位
张 玉 西安工业大学建筑工程学院
何晖 西安工业大学建筑工程学院
曾志英 西安工业大学建筑工程学院
刘瑾 西安工业大学建筑工程学院
丁潇 西安工业大学建筑工程学院
杨倩 西安工业大学建筑工程学院
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中文摘要:
      基于TSZ-3型应变控制式三轴剪切仪,在不同固结围压条件下对不同压实度粉煤灰-石灰改良黄土和压实黄土进行了常规三轴加载试验,研究了竖向加载条件下改良黄土和压实黄土的应力-应变演化关系、强度特性及其破坏方式的差异。研究结果表明:改良黄土的应力应变曲线以软化型为主,屈服即意味着破坏;压实黄土全部为应变硬化型,可用双曲线描述,属于渐进屈服破坏。固结围压和压实度均会对压实和改良黄土的强度产生较大影响,两者之间的耦合关系共同决定黄土的强度。改良黄土的粘聚力值均远大于压实黄土,内摩擦角略微大于压实黄土;改良黄土在剪切前期强度增长较大,压实黄土的强度随着剪切变形的发展逐步发挥。三轴竖向加载条件下,改良黄土呈脆性滑移破坏形式,压实黄土呈剪缩侧胀破坏。
英文摘要:
      The TSZ-3 strain-controlled triaxial shear apparatus is applied to test the strength difference of fly ash-lime improved loess and compacted loess. To study the stress-strain evolution relationship, strength characteristic and failure mode of them, vertical loading triaxial tests with various compacting degree are conducted under different confining pressures. The result shows that the stress-strain relationship curve of improved loess is soften type, yield means be destroyed. The stress-strain relationship curve of compacted loess is hardening type and belongs to progressive yield failure, can be described by hyperbolic curve. Both the confining pressure and compacting degree have significant effects on the strength of the improved loess and compacted loess, the coupling relationship of them determines the strength. The cohesion of improved loess is much bigger than the compacted loess, while the internal friction angle of improved loess is slightly bigger than it. The strength of improved loess increases greatly in the early shearing period, and the compacted loess strength develops gradually with the development of shear deformation. Under the condition of triaxial vertical loading, the improved loess presents brittle slip failure modes, while the compacted loess shows shear dilatation and lateral dilation failure modes.
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