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摘要:
为研究Mg2+、Cl−和
${\rm{SO}}_4^{2-} $ ${\rm{SO}}_4^{2-} $ Abstract:In order to examine the effect of Mg2+, Cl− and
${\rm{SO}}_4^{2-} $ ${\rm{SO}}_4^{2-} $ -
Key words:
- soluble salt ions /
- salt-rich cement-soil /
- unconfined compressive tests /
- XRD /
- ESEM
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表 1 连云港软土的物理性质指标
Table 1. Physical properties of the Lianyungang soft soil
物理性质指标 平均值 范围值 含水率w/% 63.70 49.20～81.40 密度ρ/（g·cm−3） 1.68 1.56～1.79 孔隙比e 1.87 1.43～2.19 液限WL/% 44.60 42.70～47.10 塑限WP/% 24.50 22.80～26.20 液性指数IL 1.95 1.31～2.65 塑性指数IP 20.10 19.70～21.60 
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表 2 连云港软土的力学性质指标
Table 2. Mechanical properties of the Lianyungang soft soil
压缩系数α0.1−0.2/MPa−1 压缩模量Es/MPa 抗剪强度 渗透系数 c/kPa φ/（°） kh/（m·s−1） k v/（m·s−1） 平均值 2.01 1.48 7.50 8.60 2.74e-9 3.29e-9 范围值 1.03～2.74 1.16～2.35 6.10～11.30 7.40～9.90 1.43e-9～5.36e-9 1.40e-9～8.42e-9
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表 3 连云港软土和上海软土化学分析结果[7]
Table 3. Results of the chemical analysis of two different soft soils
测试项目 Ca2+/
(mg·kg−1)Mg2+/
(mg·kg−1)Cl−/
(mg·kg−1)
/
(mg·kg−1)
/
(mg·kg−1)pH值 CO2/
(mg·kg−1)连云港软土 656 5990 2960 3140 1240 7.43 45.70 上海软土 263 0 2128 79 963 7.74 150.80
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表 4 普通硅酸盐水泥（P.O 32.5）的基本参数[15]
Table 4. Basic properties of ordinary portl and cement（P.O 32.5）
类别 烧失量/% MgO/% SO3/% 初凝时间/min 终凝时间/min 7 d抗压强度/MPa 比表面积/(m2·kg−1) 实测值 2.20 2.12 2.20 205 260 26.40 380
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表 5 可溶性盐离子含量配比方案
Table 5. Experiment scheme of soluble salt ions
序号 Mg2+/（g·kg−1） Cl−/（g·kg−1） 
/（g·kg−1）
1# 2 0 0 2# 4 0 0 3# 6 0 0 4# 8 0 0 5# 10 0 0 6# 0 1 0 7# 0 2 0 8# 0 3 0 9# 0 4 0 10# 0 5 0 11# 0 0 1 12# 0 0 2 13# 0 0 3 14# 0 0 4 15# 0 0 5 16# 2 1 1 17# 2 3 5 18# 2 5 5 19# 6 1 3 20# 6 3 5 21# 6 5 1 22# 10 1 5 23# 10 3 1 24# 10 5 3 25# 0 0 0 26# 6 3 3 27# 10 5 5
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表 6 16#～24#试块的抗压强度
Table 6. Strength of cement-soil samples 16# to 24#
/MPa 编号 龄期/d 7 14 28 60 90 180 270 360 16# 0.42 0.77 1.35 1.91 2.66 2.49 3.03 3.91 17# 0.44 0.81 1.53 2.48 2.42 3.05 2.90 3.52 18# 0.39 0.63 1.59 2.60 2.83 2.72 3.11 3.62 19# 0.43 0.80 1.14 2.50 2.27 2.50 3.11 3.32 20# 0.43 0.88 1.63 2.74 2.30 2.48 3.21 3.66 21# 0.42 0.71 1.57 2.65 2.53 2.74 3.33 3.58 22# 0.39 0.80 1.63 1.93 2.57 2.06 3.18 3.61 23# 0.41 0.83 1.51 1.91 2.22 2.99 3.63 3.15 24# 0.35 0.81 1.46 2.38 2.69 2.83 3.77 3.61
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表 7 不同龄期条件下Mg2+、Cl−和
${\rm{SO}}_4^{2-} $ 的极差和方差计算结果Table 7. Calculation results of the range and variance
龄期/d 极差 方差 影响程度 Mg2+ Cl− 
Mg2+ Cl− 
7 4.12e-2 3.55e-2 1.65e-2 2.72e-3 1.94e-3 4.44e-4 Mg2+>Cl−> 
14 7.75e-2 1.21e-1 3.83e-2 1.01e-2 2.24e-2 2.82e-3 Cl−>Mg2+> 
28 8.73e-2 1.87e-1 2.38e-1 1.14e-2 6.35e-2 8.57e-2 
>Cl−>Mg2+60 5.55e-1 4.26e-1 2.94e-1 4.64e-1 2.77e-1 1.59e-1 Mg2+>Cl−> 
90 2.71e-1 3.63e-1 1.11e-1 1.10e-1 1.97e-1 2.15e-2 Cl−>Mg2+> 
180 1.79e-1 4.86e-1 3.70e-1 5.09e-2 4.10e-1 2.41e-1 Cl−> 
>Mg2+270 5.10e-1 2.94e-1 1.59e-1 3.96e-1 1.29e-1 3.85e-2 Mg2+>Cl−> 
360 2.28e-1 1.74e-1 1.44e-1 8.35e-2 5.66e-2 2.15e-2 Mg2+>Cl−> 
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