某低厨余填埋场垃圾物理力学特性演化规律

陈宏信; 吕东江; 冯世进; 张晓磊; 吴少杰

doi:10.11779/CJGE20220551

某低厨余填埋场垃圾物理力学特性演化规律 English Version

陈宏信^{1, 2,},
吕东江^{1, 2},
冯世进^{1, 2, ,},
张晓磊^{1, 2},
吴少杰^{1, 2}

1.
同济大学地下建筑与工程系, 上海 200092
2.
同济大学岩土及地下工程教育部重点实验室, 上海 200092

基金项目:

国家重点研发计划项目 2020YFC1808103

国家自然科学基金项目 41931289

国家自然科学基金项目 42077250

国家自然科学基金项目 42277148

详细信息

作者简介:
陈宏信(1987—)，男，博士，副教授，主要从事环境岩土方向的教学和科研工作。E-mail: chenhongxin@tongji.edu.cn

通讯作者:
冯世进, E-mail: fsjgly@tongji.edu.cn

中图分类号: TU431
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出版历程
- 收稿日期: 2022-05-04
- 网络出版日期: 2023-09-06
- 刊出日期: 2023-08-31

Evolution of physical and mechanical properties of municipal solid waste in a landfill with low kitchen waste content

CHEN Hongxin^{1, 2,},
LÜ Dongjinag^{1, 2},
FENG Shijin^{1, 2, ,},
ZHANG Xiaolei^{1, 2},
WU Shaojie^{1, 2}

1.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Shanghai 200092, China

摘要

摘要: 垃圾分类处理将导致中国填埋场中厨余垃圾占比显著下降，对填埋场的长期安全运营提出了新的要求。对中国某低厨余城市生活垃圾（MSW）填埋场进行了现场抽水、电阻率测试及室内垃圾组分、质量含水率、剪切强度等测试，分析了其物理力学特性变化。结果表明经过两年抽水后垃圾组分变化不大，但垃圾特性分布更加离散；低厨余垃圾受历史填埋垃圾影响，含水率为86%~161%，经过抽水后降低至42%~116%；抽水后填埋场整体水位下降但在10~15 m深度出现了局部的高含水区域；填埋场垃圾黏聚力及内摩擦角分布范围分别为0~20 kPa及15°~30°，黏聚力及内摩擦角变化范围较大，且黏聚力低于国内一般高厨余垃圾填埋场，抽水后垃圾的剪切强度总体下降但剪切硬化现象更加明显。
- 填埋场 /
- 低厨余 /
- 含水率 /
- 抽水 /
- 剪切强度
Abstract: The classified treatment of the municipal solid waste (MSW) will lead to a significant decline in the proportion of kitchen waste in landfills in China, which puts forward new requirements for the long-term safe operation of landfills. To evaluate the evolution of the physical and mechanical properties of waste in low kitchen waste landfills, the in-situ pumping and resistivity tests, and the laboratory tests on waste components, water content and shear strength of an MSW landfill with low kitchen waste content in China are carried out. The major conclusions are as follows: (1) The waste components only slightly change after two years of pumping, but the properties of the MSW become more scattering. (2) The water content is at a high level of 86%~161% which is affected by the landfilling history and location, and the range decreases to 42%~116% after pumping. The overall leachate level declines, but there is a local area with a high water content at the depth of 10~15 m, and the local leachate accumulation may be due to component dislocation and migration caused by pumping. (3) The cohesion and internal friction angle vary widely, and their ranges are 0~20 kPa and 15°~30°, respectively. The cohesion is overall lower than that of the domestic traditional landfill with a high kitchen waste content. The shear strength of the MSW after pumping is generally reduced, but the shear hardening phenomenon is more obvious.
- landfill /
- low kitchen waste content /
- water content /
- pumping /
- shear strength

HTML全文

图 1 填埋场平面布置图

Figure 1. Layout of landfill

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图 2 抽水井布置及现场测试安排

Figure 2. Layout of vertical wells and field test plan

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图 3 测试断面反演过程示意图

Figure 3. Schematic diagram of inversion process of test section

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图 4 垃圾重度沿深度变化

Figure 4. Variation of unit weight of MSW with depth

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图 5 国内外不同填埋场的垃圾组分

Figure 5. MSW components in different landfills

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图 6 A测线电阻率测试结果

Figure 6. Resistivity test results of line A

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图 7 B测线电阻率测试结果

Figure 7. Resistivity test results of line B

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图 8 垃圾含水率在抽水前后的对比

Figure 8. Comparison of water contents of MSW before and after pumping

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图 9 国内外填埋场含水率对比

Figure 9. Comparison of water contents of MSW in different landfills

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图 10 垃圾试样的剪切应力-位移曲线

Figure 10. Shear stress-displacement curves of MSW

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图 11 剪切强度参数沿深度变化

Figure 11. Variation of shear strength parameters with depth

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图 12 垃圾试样的剪切强度包线

Figure 12. Shear strength envelopes of MSW

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图 13 国内外垃圾剪切强度对比

Figure 13. Comparison of shear strength parameters of MSW

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表 1 垃圾取样信息

Table 1 Sampling information of MSW

钻孔	Y_s/年	N_s/个	d_p/m- y_s/a
A1	2019	5	2.5-0.5，7.5-0.5，12.5-2，17.5-2，22.5-4
A2	2019	5	2.5-0.5，7.5-0.5，12.5-2，17.5-2，22.5-4
B1	2021	4	2.75-2.5，7.25-2.5，11.75-4，16.25-4
B2	2021	4	2.75-2.5，7.25-2.5，11.75-4，16.25-4
注：Y_s为取样年份；N_s为取样个数；d_p为取样深度；y_s为龄期。

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表 2 垃圾室内直剪试验方案

Table 2 Schemes for direct shear tests on MSW

编号	Y_s/年	N_p/kPa	d_p/m	y_s/a	γ/(kN·m^-3)	w/%
A1-1	2019	100，200，400	2.5	0.5	6.2	90.0
A1-2			7.5	0.5	6.6	85.5
A1-3			12.5	2	8.8	161.2
A1-4			17.5	2	9.6	100.5
A1-5			22.5	4	11.2	91.3
A2-1			2.5	0.5	7.6	85.6
A2-2			7.5	0.5	7.8	91.3
A2-3			12.5	2	9.3	150.8
A2-4			17.5	2	8.4	124.5
A2-5			22.5	4	10.8	90.1
B1-1	2021	100，200，400	2.75	2.5	9.4	62.3
B1-2			7.25	2.5	7.8	115.5
B1-3			11.75	4	7.0	89.0
B1-4			16.25	4	12.2	89.3
B2-1			2.75	2.5	6.5	60.2
B2-2			7.25	2.5	9.6	67.9
B2-3			11.75	4	6.7	57.2
B2-4			16.25	4	7.8	42.3
注：N_p为正应力。

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