基质对杂填土力学性质的影响

陈宇; 张福海; 刘峥嵘; 张恒; 王少鹏

doi:10.13204/j.gyjzg21070805

基质对杂填土力学性质的影响

doi: 10.13204/j.gyjzg21070805

河海大学岩土力学与堤坝工程教育部重点实验室, 河海大学岩土工程科学研究所, 南京 210024

基金项目:

国家自然科学基金项目（51778211）；中央高校基本科研业务费专项资金资助（B200204036）。

详细信息

作者简介:
陈宇,男,1995年出生,博士研究生。

通讯作者:
张福海,男,1970年出生,博士,教授,fhzhang@hhu.edu.cn。

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- 文章访问数: 225
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-08
- 网络出版日期: 2022-10-28

Influence of Matrices on Mechanical Properties of Miscellaneous Fillings

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University/Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210024,China

摘要

摘要: 采用中型三轴仪，对南京吉山矿区堆放场的杂填土进行试验研究。通过对含石量为30%的粉质黏土、砂土、粉土三种基质的杂填土分别进行不同围压下的剪切试验，分析基质对杂填土力学性质的影响。结果表明：三种基质杂填土的（σ₁-σ₃）-ε₁关系曲线为双曲线，属应变硬化性曲线。相同围压下，在低围压时，随着基质的变化，杂填土破坏时的偏差应力相差不大，在高围压时，随着基质的变化，杂填土破坏时的偏差应力存在着显著差异。同一基质下，随着围压的增大，杂填土破坏时的偏差应力也逐渐增大，其中基质为粉土的杂填土破坏时的偏差应力增量最大。基质为粉质黏土和粉土的杂填土，始终呈剪缩状。砂土基质的杂填土，随着轴向应变的增大，体应变变化较为复杂；在围压为100 kPa时，砂土先呈现减缩后呈现剪胀的变化规律；在围压为200，400 kPa时，始终呈剪缩状。通过对强度参数特性指标和本构模型计算参数的综合比较，发现基质是影响杂填土力学参数的一个重要因素。
- 杂填土 /
- 基质 /
- 中型三轴试验 /
- 应力-应变-强度特性
Abstract: By using the medium-sized triaxial apparatus, the miscellaneous fill in the dump of the Jishan mining area in Nanjing was studied. Through the confining pressure tests of 100 kPa, 200 kPa and 400 kPa for miscellaneous fillings of silty clay, sand and silt with the stone content of 30%, the influence of matrixs on the mechanical properties of miscellaneous fillings was analyzed. The results showed that the (σ₁-σ₃)-ε₁ curves of miscellaneous fillings were hyperbolic and displayed a strain hardening tendency. Under the same confining pressure, when the confining pressure was low, with the change of the matrixs, the differences for deviation stress of miscellaneous fillings were very similar. When the confining pressure was high, with the change of the matrixs, the differences of deviation stress of miscellaneous fillings were significant. For the same matrix, with the increase of confining pressure, the deviation stress differences of miscellaneous fillings increased gradually, and the increase of deviation stress differences for miscellaneous fillings of silt was the largest. For the miscellaneous fillings of silty clay and silt, the volume was always in shear shrinkage. With the increase of axial strain, changes for the volume strain of miscellaneous fillings of sand were more complex. When the confining pressure was 100 kPa, the miscellaneous fillings of sand showed a shear shrinkage tendency first, and then dilatancy. When the confining pressure was 200 kPa and 400 kPa, sand was always in shear shrinkage. Based on comprehensive comparisons of strength parameters and constitutive model parameters, it indicated that the matrix was an important factor influencing the mechanical parameters of miscellaneous fillings.
- miscellaneous filling /
- matrix /
- medium-sized triaxial test /
- stress-strain-strength characteristics

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参考文献(20)

[1]	李腾. 建筑垃圾杂填土强度特性的试验研究和数值分析[D]. 天津:天津大学, 2014.
[2]	TIMOTHY G L. Shear strength of municipal solid waste for stability analyses[J]. Environ Geol, 2009, 57:1911-1923.
[3]	BRAY J D. Shear strength of municipal solid waste[J]. Journal of Geotechnical and Geoenvironmental Engineering,2009, 57(8):709-722.
[4]	ZHAN T L T,CHEN Y M,LING W A. Shear strength characterization of municipal solid waste at the Suzhou landfill,China[J]. Engineering Geology,2008, 3:97-111.
[5]	HUVAJ-SARIHAN T D K,LI G C. Shear strength of municipal solid waste for stability analyses[J]. Environmental Geology. 2009,57:1911-1923.
[6]	VALSANGKAR A J,PELKEY S P,LANDVA A. Shear displacement dependent strength of municipal solid waste and its major constituent[J]. Geotechnical Testing Journal,2001,24(4):381-390.
[7]	MEDLEY E W. The engineering characterization of melanges and similar block-in-matrix rocks(bimrocks)[D]. Berkeley:University of California, 1994.
[8]	舒志乐, 刘新荣, 刘保县, 等. 土石混合体粒度分形特性及其与含石量和强度的关系[J]. 中南大学学报(自然科学版), 2010, 41(3):1096-1101.
[9]	徐文杰, 胡瑞林, 岳中琦, 等. 基于数字图像分析及大型直剪试验的土石混合体块石含量与抗剪强度关系研究[J]. 岩石力学与工程学报, 2008, 27(5):996-1007.
[10]	VALLEJOLE M R. Porosity influence on the shear strengh of granular material-clay mixtures[J]. Engineering Geology,2000,58(2):125-136.
[11]	李晓, 廖秋林, 赫建明, 等. 土石混合体力学特性的原位试验研究[J]. 岩石力学与工程学报,2007, 26(12):2377-2384.
[12]	金磊, 曾亚武, 张森. 块石含量及形状对胶结土石混合体力学性能影响的大型三轴试验[J]. 岩土力学, 2017, 38(1):141-149.
[13]	李维树, 丁秀丽, 邬爱清, 等. 蓄水对三峡库区土石混合体直剪强度参数的弱化程度研究[J].岩土力学,2007,28(7):1338-1342.
[14]	杨小彬,侯鑫,裴艳宇,等.大粒径石块分布对土石混合体稳定性的影响[J].科学技术与工程,2020,20(31):12962-12967.
[15]	张敏超,刘新荣,王鹏,等.不同含石量下泥岩土石混合体剪切特性及细观破坏机制[J].土木与环境工程学报(中英文),2019,41(6):17-26.
[16]	景宏君,张延青,顾行文,等.土石混合填料大型三轴剪切试验研究[J].西安科技大学学报,2019,39(2):270-275.
[17]	赵鑫曜,陈建功,张海权,等.基于块石形状数据库的土石混合体模型随机生成方法[J].岩土力学,2018,39(12):4691-4697.
[18]	唐建一,徐东升,刘华北.含石量对土石混合体剪切特性的影响[J].岩土力学,2018,39(1):93-102.
[19]	姜景山,刘汉龙,程展林,等. 密度和围压对粗粒土力学性质的影响[J]. 长江科学院院报,2009,26(8):46-50.
[20]	邓肯J M,张C Y,姜朴.土的应力与应变非线性分析[J].水利水运科技情报,1973(增刊2):1-19.