| Citation: |
YUAN Bo, SHAO Jicheng, LUO Jiacheng, YE Hongfeng. An experimental study of reinforcement of the Wenzhou sludge based on the consolidation and solidification composite technology[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 66-74. doi: 10.16030/j.cnki.issn.1000-3665.202103035
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An experimental study of reinforcement of the Wenzhou sludge based on the consolidation and solidification composite technology
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Abstract
In order to reinforce the soft sludge and makes it meet the certain bearing capacity of the engineering construction, the consolidation and solidification composite technology is used to reinforce the sludge in the field site. During the test, a certain thickness of sludge is divided into a shallow solidification layer and a deep consolidation layer. The solidification technology is used to reinforce the shallow (≤1 m) sludge so as to form a high-strength overlying crust. For the deep (>1 m) sludge, the vacuum preloading technology is used to improve the bearing capacity of the deep sludge and control the later settlement of the reinforced soil. The experimental results show that the characteristic value of the shallow solidified soil bearing capacity ranges from 109 to 330 kPa when the dosage of solidified agent is 0.6%～5.0%. The consolidation and solidification composite technology has a prominent effect on the reinforcement of the sludge and the characteristic value of the overall bearing capacity of the layered reinforced soil varies between 89 and 230 kPa. After the solidification treatment of the shallow sludge, the soil strength is higher, which can generate an obvious diffusion effect on the surface load and effectively reduces the additional stress in the underlying layer caused by the surface load. The stress diffusion angle of shallow solidified soil in most test units varies between 19.474° and 26.303° in this experiment.
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References
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YUAN Bo, SHAO Jicheng, LUO Jiacheng, YE Hongfeng. An experimental study of reinforcement of the Wenzhou sludge based on the consolidation and solidification composite technology[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 66-74. doi: 10.16030/j.cnki.issn.1000-3665.202103035
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Figure 1.
Schematic diagram of vertical reinforcement of sludge in each test unit
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Figure 2.
Monitoring points for settlement
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Figure 3.
Monitoring results of the soil settlement in each test unit
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Figure 4.
Results of the cone penetration test
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Figure 5.
Summary of the average values of the specific penetration resistance in the shallow (1 m) solidified soil
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Figure 6.
Results of the plate loading test of the shallow solidified soil
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Figure 7.
Deformation modulus of the shallow solidified soil
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Figure 8.
Results of the plate loading test of the layered reinforced soil （0.707 m×0.707 m）
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Figure 9.
Calculation diagram of the stress spread angle
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Figure 10.
Relationship between the ratio of deformation modulus and stress spread angle
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Figure 11.
Excavation effect of the reinforced sludge