In order to improve the strength of Wenzhou silt and conduct resource utilization, solidified agent was used to solidify silt in the laboratory, so as to explore the changes of various physical properties of silt when adding different dosage of solidified agent. Besides, the solidification test of the silt was carried out in the field, the cone penetration test and load plate test were used to evaluate the bearing capacity of the solidified silt, exploring the solidification effect of the solidified agent on the silt in the actual engineering. The laboratory test results show that when the dosage of solidified agent is more than 4%, the compression coefficient of the silt decreases obviously, and the engineering properties of the soil are effectively improved. When the dosage of solidified agent is 8%, after curing for 28 days, the cohesion and internal friction angle of solidified sludge are 216.25 kPa and 28.6°, respectively. The cone penetration tests show that when the dosage of solidified agent is 4 ~ 8%, the characteristic value of bearing capacity of solidified silt is 121.52 kPa ~ 146 kPa. The bearing capacity of soil under plate load test is higher than that of cone penetration test. The dosage of 4% ~ 8% solidified agent can be used as an effective reference in the actual project of resource utilization of Wenzhou silt.

To dispose of sludge and construction waste and facilitate their common resource utilization, the solidification tests of sludge are carried out in the laboratory and in site. In the field test, the construction waste is used as aggregate and added to the sludge by 15% of the mass ratio of the sludge, and then the sludge solidified agent is added to the sludge. Sludge, construction waste and solidified agent are mixed evenly by mechanical stirring, and finally the solidified soil is cured. The laboratory test results show that when the content of solidified agent is 8%, the strength of solidified sludge is quite high, and the laboratory UCS of solidified sludge can reach 320 kPa after curing for 28 days. The cone penetration test and plate loading test in field show that the solidified agent has an obvious solidifying effect on sludge. With low dose solidified agent, the structure effect of aggregate is not obvious. When the content of solidified agent is 8%, the structure effect of aggregate is beneficial in improving the bearing capacity of solidified sludge and the characteristic soil bearing capacity can reach 325 kPa. The improvement rate of solidified sludge by structure effect is 71.05%, which facilitates the common resource utilization of silt and construction waste.