Influence of organic matter content and ingredient on the physical and mechanical properties of peat soils
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摘要:
富含有机物质是泥炭土工程性质不良的主要原因。不同有机质含量及组分的泥炭土，其物理力学性质差异很大。为明确有机质含量的影响，对数十组不同有机质含量无定形泥炭土试样进行一系列室内试验，系统分析了物理、变形、强度及渗透性随有机质含量的变化规律；为比较有机质组分不同导致的工程性质差异，将以上无定形泥炭土物理力学指标与纤维泥炭土试验数据进行系统分析。结果表明：无定形泥炭土基本物理力学指标与有机质含量间有一定的线性关系，其中，初始孔隙比（e0）、天然含水率（w0）、液塑限（wL、wp）、黏聚力（c）随有机质含量增加线性增大，比重（Gs）、固结系数（Cv）和内摩擦角（φ）随有机质含量增大而减小。相较无定形泥炭土，纤维泥炭土比重小、含水率大、孔隙比大。抗剪强度方面，无定形泥炭土黏聚力随有机质含量增大而增大，较纤维泥炭土略高；内摩擦角随有机质含量增大而有下降趋势，约为纤维泥炭土的1/5～1/14。渗透性方面，无定形泥炭土的初始渗透系数（kv0）及渗透指数（Ck）随有机质含量增大而减小，且普遍小于纤维泥炭土。
Abstract:Peat soil is rich in organic matter, which is the main reason for its poor engineering properties. The content and compositions of organic matter of peat soil lead to the various physical and mechanical properties of this kind of soil. In order to clarify the influence of organic matter content, a series of laboratory tests are conducted on dozens of groups of amorphous peat soil samples with different organic matter content, and the laws of physics, deformation, strength and permeability with organic matter content are systematically analyzed. In order to compare the difference in engineering properties caused by the different organic matter components, the experimental data of the fiber peat soil from domestic and foreign literatures are collected and compared systematically with the physical and mechanical indexes of the amorphous peat soil. The results show that there is a certain linear relationship between the basic physical and mechanical indexes of the amorphous peat soil and the organic matter content. Among them, the initial void ratio (e0), natural moisture content (w0), liquid plastic limit (wp, wL), cohesion (c) increases linearly with the increase of the organic matter content. Specific gravity (Gs), consolidation coefficient (Cv) and internal friction angle (φ) decrease with the increase in organic matter content. Compared with the amorphous peat soil, the fiber peat soil is characterized by small specific gravity, high water content and a large void ratio. In terms of shear strength, the cohesive force of the amorphous peat increases with the increase of organic matter content, which is slightly higher than that of the fiber peat soil. The internal friction angle has a downward trend with the increase of organic matter content, which is about 1/5～1/14 that of the fiber peat soil. In terms of permeability, the initial permeability coefficient (kv0) and permeability index (Ck) of the amorphous peat soil decrease with the increase in organic matter content, and are generally smaller than those of the fiber peat soil.
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表 1 施甸泥炭土基本物理力学指标
Table 1. Basic physical and mechanical indexes of the Shidian peat soil
指标参数 样本数 最小值 最大值 平均值 天然含水率w0/% 38 59.3 221.5 132.8 颗粒比重Gs 38 1.9 2.6 2.3 天然孔隙比e0 38 1.6 3.9 1.6 饱和度Sr /% 38 80.7 98.2 93.8 液限wL /% 38 75.7 307.9 192.3 塑限wp /% 38 26.3 210.0 101.4 有机质含量wu /% 38 10.4 58.0 25.3 固结系数Cv /(10−4cm2·s−1) 38 1.1 8.3 4.0 黏聚力c /kPa 38 5.3 15.9 10.9 内摩擦角φ/ (°) 38 1.1 4.8 2.8 渗透系数kv0/ (cm·s−1) 38 2.1×10−9 1.3×10−6 5.4×10−7 
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表 2 泥炭土物理力学指标统计表
Table 2. Physical and mechanical indexes of the peat soil
泥炭土
产地Von
Post值有机质含量
wu/%纤维含量
wf/%颗粒比重
Gs含水率
w0/%孔隙比
e0液限
wL/%塑限
wP/%黏聚力
c/kPa内摩擦角
φ/（°）渗透系数
kv0/（cm·s−1）固结系数Cv/
（10−4cm2·s−1）来源 施甸 H8～H10 10～58 <5 1.90～2.60 59.3～221.5 1.6～3.9 75.7～
307.926.3～
210.05.3～15.9 1.1～4.8 0.8×10−7～
3.5×10−70.9～2.6 本文 Nine
springsH2～H3 74～84 75～92 — 562～655 — — — — 30.0～64.3 — — Edil et al[3] Richfied H3 25～31 37～45 — 153～181 — — — — 38.1～58.3 — — Hoyt
LakesH4～H5 3～70 50～58 — — — — — — 36.8～56.7 — — 吉林 H4～H6 27～88 65～50 1.50～2.10 100～510 2.2～10.8 27.5～
87.5— 4.9～7.0 25.8～27.7 1×10−9～
1×10−29.9～24.5 吕岩等[4] Malaysia H2～H4 10～95 — 1.10～2.60 167.5～672.5 1.0～8.1 173.7～
361.2— — — — — Huat et al[5] Banting H2～H5 70～88 — 1.42～2.6 181～350 4.1～10.5 285.0～
330.0— 6.2～12 26.5～34.3 — — Huat et al[5] Ackc H5 1.4～98 — 1.46～2.67 560～890 — — — — — — — Skempton
et al[6]滇池 H7～H10 22.94～32.44 — 1.84～2.55 103.8～306.7 — — — 11.6～22.2 2.2～17.2 4.9×10−7～
1.0×10−3— 蒋忠信[22] Ohmiv H3～H4 30～80 — 1.60～2.30 330～1200 7.0～18.0 100.0～
505.056.7～
368.0— — — — Yamaguchi[24] James
bayH3～H4 96 — 1.50～1.64 1000～1340 18.0～23.5 — — — — 1.3×10−9～
1.0×10−2— Mesri et al[26] Middieton H3～H4 90～95 — 1.53～1.65 510～850 8.3～14.2 — — — — 10−10～10−5 — Turkey
ACH3～H4 22.3～71.7 — 1.63～2.14 118.3～211.7 3.2～4.7 310.2～
320— 1.7 16.2 — 2.4～6.2 Ulusay[27] Turkey
SKH5～ H7 55～58 — 1.66～2.44 105.0～559.0 2.7～3.3 147.5～
317.2— 1.6 16.2 — 1.7～22.5 Urmia H3～H6 25～77 — 1.63～2.35 102～671 2.4～11.2 — — — — 1.3×10−8～
1.6×10−60.3～253.7 Badv
et al[28]Middleton,
etcH2～H3 9.9～95 20～60.4 1.54～2.56 — 2.6～19.8 — — — — — — Cranberry
BogsnittH2～H4 60 ～77 40～52 1.48～1.52 759～946 — 580.0～
600.0375～
400— — 3.1×10−5～
2.9×10−52.5～1503 Elsaysed
et al[29]Bogs H2～H4 — — — — — — — — — 1.0×10−7～
4.0×10−4— Hanrahan[30] Muskeg H3～H4 84.2～95.4 — 1.41～1.7 605～1290 10.3～17.5 — — — — 1.0×10−4 — Samson[31] Matagam H2～H4 68～99.3 40～80 — 660～1591 — — — — — 5.0×10−5～
5.0×10−3— Lefebvre[32] Middleton H3 — — — 610～850 — — — — — 6.0×10−6～
5.0×10−5— Mesri[33] Wisconsin H1～H3 — 20～64 1.41～1.94 240～600 — — — — — 2.0×10−8～
5.0×10−5— Dhowian [34] Surfers
ParadiseH2～H3 63～68 — 1.57 168～247 — 259.0～
305.0125～
207— — 2.4×10−5～
1.4×10−33.6～128.4 Al-Ani [35] Banyuasin
regency and
SumatraH1～H4 >80 >20 1.39～1.90 200～700 3.0～15.0 — — — — 1.9×10−4～
4.9×10−49.8～57.4 Sutejo
et al[36]Klang H4 88.6～99.1 90.25～
90.491.23～1.48 572.9～690.9 8.0～9.6 — — — — 6.3×10−4 38.1～164.9 Ali[37] Thompson H2～H5 — — — 612～1161 — — — — — 8.0×10−5 — Earl[38] Minnesota H2～H3 — 87.3 — — — — — — — >18.0×10−4 — Boelter[39]
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