有机质含量对磷酸镁水泥固化土性质的影响研究

俞良晨; 闫超; 郭书兰; 阎长虹; 李想林

doi:10.13544/j.cnki.jeg.2019-416

有机质含量对磷酸镁水泥固化土性质的影响研究

doi: 10.13544/j.cnki.jeg.2019-416

俞良晨^{①, ②,},
闫超^②,
郭书兰^①,
阎长虹^{①, ③, ,},
李想林^②

①.
南京大学地球科学与工程学院，南京 210023，中国
②.
安徽大学资源与环境工程学院，合肥 230601，中国
③.
南京大学金陵学院，南京 210089，中国

基金项目:

江苏省科技厅社会发展面上项目 BE2019705

江苏省地质矿产勘查局科技项目 2017-KY-1

详细信息

作者简介:
俞良晨(1995-)，男，硕士生，主要从事城市环境岩土工程、边坡工程方向的研究. E-mail: ylc1203@126.com

通讯作者:
阎长虹(1959-)，男，博士，教授，博士生导师，从事水文地质工程地质、城市环境岩土工程科研教学工作. E-mail: yanchh@nju.edu.cn

中图分类号: P642.13⁺9
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出版历程
- 收稿日期: 2019-10-08
- 修回日期: 2019-11-27
- 刊出日期: 2020-04-25

STUDY ON THE EFFECT OF ORGANIC CONTENT ON PROPERTIES OF MAGNESIUM PHOSPHATE CEMENT SOLIDIFIED SOIL

YU Liangchen^{①, ②
,},
YAN Chao^②,
GUO Shulan^①,
YAN Changhong^{①, ③
, ,},
LI Xianglin^②

①.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
②.
School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China
③.
Nanjing University Jinling College, Nanjing 210089, China

Funds:

the Social Development Project of Jiangsu Science and Technology Department BE2019705

the Science and Technology Project of Jiangsu Geology & Mineral Exploration Bureau 2017-KY-1

摘要

摘要: 许多重要的软土工程譬如基坑、路基工程在破坏后需要快速修复，磷酸镁水泥的出现很好地满足了这一现代建设的要求，但不同地区软土的有机质含量不同，而有机质的含量对固化土的性质有着重要影响。为了研究磷酸镁水泥加固不同有机质含量软土的加固规律，本文通过向烘干后的软土中添加腐殖酸，人为制备不同有机质含量的土样，并取相同条件下PO水泥加固软土作对比，通过相关力学试验得到以下规律：两种水泥在加固不同含量有机质软土的过程中，加固效果都会随着有机质含量的升高而逐渐降低；磷酸镁水泥在快速修复和凝结方面明显优于PO水泥，但磷酸镁水泥中长期加固有机质软土的效果却不及PO水泥。同时利用SEM试验对得到的规律进行了解释并分析其微结构演化特征。该研究成果独到地分析了有机质含量变化对磷酸镁水泥加固效果的影响，证明了磷酸镁水泥可以应用于软土的抢修工程建设中，对加固软土工程具有指导和借鉴意义。
- 磷酸镁水泥 /
- PO水泥 /
- 软土 /
- 力学强度 /
- 微观结构
Abstract: Many important soft soil projects need to be repaired quickly after failure, such as foundation pits and subgrade engineering. The appearance of magnesium phosphate cement satisfies the requirements of modern construction. However, the difference of the organic content of soft soil in different regions has an important influence on the properties of the solidified soil. We prepare soil samples with different organic contents by adding humic acid to the soft soil and study the reinforcement of soft soil with different organic contents by magnesium phosphate cement, contrast with the reinforced soft soil of PO cement under the same conditions. Finally, the following laws are obtained through the relevant mechanical tests: in the process of strengthening different organic contents of soft soil, the reinforcement effect can gradually decrease with the increase of organic content. Magnesium phosphate cement is obviously superior in rapid repair and condensation than PO cement. But long-term reinforcement effect of the magnesium phosphate cement in soft soil is not as good as that of PO cement. At the same time, SEM test is used to explain the obtained rules and analyze the microstructure evolution characteristics. Magnesium phosphate cement can be applied to the construction of soft soil repair projects. The research results uniquely analyze the influence of organic content change on the strengthening effect of magnesium phosphate cement, which has guiding and reference significance for reinforcing soft soil projects.
- Magnesium phosphate cement /
- PO cement /
- Soft soil /
- Mechanical strength /
- Microstructure

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图 1 固化土应力-应变曲线

a.磷酸镁水泥固化土应力-应变曲线(7 d)；b. PO水泥固化土应力-应变曲线(7 d)；c.磷酸镁水泥固化土应力-应变曲线(14 d)；d. PO水泥固化土应力-应变曲线(14 d)；e.磷酸镁水泥固化土应力-应变曲线(28 d)；f. PO水泥固化土应力-应变曲线(28 d)

Figure 1. Stress-strain curve of solidified soil

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图 2 剪切位移与剪应力

Figure 2. Shear displacement and shear stress

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图 3 竖向压力对应的抗剪强度

Figure 3. The shear strength corresponding to vertical pressure

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图 4 磷酸镁水泥固化土SEM图片

Figure 4. SEM of magnesium phosphate cement solidified soil

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图 5 固化土水化SEM图片

Figure 5. SEM of hydration of solidified soil

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图 6 磷酸镁水泥固化土SEM图片

Figure 6. SEM of magnesium phosphate cement solidified soil

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图 7 PO水泥固化土10 000倍SEM图片

Figure 7. 10 000 times SEM image of PO cement solidified soil

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图 8 两种水泥加固效果10 000倍SEM图片

Figure 8. Two kinds of cement reinforcement effect on 10 000 times SEM image

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表 1 软土的物理力学性质指标

Table 1. Physico-mechanical indices of soft soil samples

天然密度 /g·cm^-3	土粒相对密度	含水率 /%	液限 /%	塑限 /%	塑性指数	液性指数	孔隙率	压缩模量 /MPa	压缩系数 /MPa^-1	黏粒 /%	有机质 /%
1.81	2.70	39.7	45	22	23	0.68	0.63	1.702	0.826	41.3	0.3

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表 2 磷酸镁水泥组成

Table 2. Composition of magnesium phosphate cement

组分	氧化镁(M)	磷酸二氢钾(P)	硼砂(B)
比例	20	5	1

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表 3 PO水泥和磷酸镁水泥固化土无侧限抗压强度试验结果

Table 3. Test results of unconfined compressive strength of PO cement and magnesium phosphate cement solidified soil

编号	腐殖酸含量 /%	无侧限抗压强度/kPa
		7 d		14 d		28 d
		磷酸镁水泥	PO水泥	磷酸镁水泥	PO水泥	磷酸镁水泥	PO水泥
1	0	497.48	253.96	635.31	995.28	787.73	1373.27
2	3	417.89	190.78	578.68	725.25	715.41	1131.86
3	6	371.28	162.85	423.85	611.23	555.22	1008.41
4	9	374.94	138.91	405.86	421.93	575.59	781.71
5	12	370.52	130.33	383.26	586.35	565.96	717.76

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表 4 PO固化土和磷酸镁固化土黏聚力试验结果

Table 4. Test results of cohesion of PO-stabilized soils and magnesium phosphate-stabilized soils

编号	腐殖酸含量 /%	黏聚力c/kPa
		7 d		14 d		28 d
		磷酸镁水泥	PO水泥	磷酸镁水泥	PO水泥	磷酸镁水泥	PO水泥
1	0	179.83	142.26	202.54	242.26	250.00	525.65
2	3	173.54	118.12	193.35	218.12	235.50	452.69
3	6	169.07	106.35	179.80	196.35	230.12	360.02
4	9	165.48	104.71	174.73	194.71	226.34	359.03
5	12	164.45	100.36	170.14	180.36	216.97	345.10

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表 5 PO固化土和磷酸镁固化土内摩擦角试验结果

Table 5. Test results of internal friction angle of PO-stabilized soil and magnesium phosphate-stabilized soil

编号	腐殖酸含量 /%	内摩擦角φ/(°)
		7 d		14 d		28 d
		磷酸镁水泥	PO水泥	磷酸镁水泥	PO水泥	磷酸镁水泥	PO水泥
1	0	29.69	27.18	31.53	35.94	32.06	40.10
2	3	27.27	24.16	29.00	33.50	30.75	35.11
3	6	23.12	20.67	25.96	30.50	27.06	33.98
4	9	21.96	19.45	23.37	28.00	24.00	32.23
5	12	17.20	15.41	19.00	24.50	20.31	24.98

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表 6 物相统计及标记

Table 6. Phase statistics and markers

名称	化学式	标记
绿泥石	(Mg，Fe²⁺，Fe³⁺，Al)₆((Si，Al)₄O₁₀)(OH)₈	Chl
高岭石	Al₂Si₂O₅(OH)₄	K
水化磷酸镁	Mg₃(PO₄)₂	MP
钾磷酸盐	MgKPO₄·6H₂O	MKP
水滑石	Mg₆Al₂(CO₃)(OH)₁₆·4H₂O	HT
钙矾石	3CaO·Al₂O₃·3CaSO₄·32H₂O	AFt
水化硅酸钙	CaO·Al₂O₃·10H₂O	CSH
方镁石	MgO	M

下载: 导出CSV

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有机质含量对磷酸镁水泥固化土性质的影响研究

doi: 10.13544/j.cnki.jeg.2019-416

作者简介:
俞良晨(1995-)，男，硕士生，主要从事城市环境岩土工程、边坡工程方向的研究. E-mail: ylc1203@126.com

通讯作者:
阎长虹(1959-)，男，博士，教授，博士生导师，从事水文地质工程地质、城市环境岩土工程科研教学工作. E-mail: yanchh@nju.edu.cn

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STUDY ON THE EFFECT OF ORGANIC CONTENT ON PROPERTIES OF MAGNESIUM PHOSPHATE CEMENT SOLIDIFIED SOIL

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有机质含量对磷酸镁水泥固化土性质的影响研究

doi: 10.13544/j.cnki.jeg.2019-416

作者简介: 俞良晨(1995-)，男，硕士生，主要从事城市环境岩土工程、边坡工程方向的研究. E-mail: ylc1203@126.com

通讯作者: 阎长虹(1959-)，男，博士，教授，博士生导师，从事水文地质工程地质、城市环境岩土工程科研教学工作. E-mail: yanchh@nju.edu.cn

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STUDY ON THE EFFECT OF ORGANIC CONTENT ON PROPERTIES OF MAGNESIUM PHOSPHATE CEMENT SOLIDIFIED SOIL

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出版历程

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作者简介:
俞良晨(1995-)，男，硕士生，主要从事城市环境岩土工程、边坡工程方向的研究. E-mail: ylc1203@126.com

通讯作者:
阎长虹(1959-)，男，博士，教授，博士生导师，从事水文地质工程地质、城市环境岩土工程科研教学工作. E-mail: yanchh@nju.edu.cn