某堆场试验区软基处理工程效果分析

Soft Ground Treatment Effect Analysis of the Test Area in a Storage Yard

试验区采用真空联合堆载法进行软基处理,室内土工试验表明,地基的力学性质有一定的提高,处理后淤泥层含水率、孔隙比及压缩系数分别下降了9.32%、6.59%和2.68%;而湿密度、φ、c及压缩模量分别提高了1.09%、40.48%、10.02%和13.53%;现场十字板抗剪强度试验结果表明,埋深15m以上淤泥不排水十字板抗剪强度平均增长了25.9%。通过现场沉降监测和孔隙水压力监测的试验数据,试验区经110d的真空联合堆载法处理,理论估算地基平均固结度≤90%。处理措施需要进一步优化。

The soft ground treatment of the test area used vacuum combined with surcharge preloading.The results of laboratory soil test showed that the mechanical properties of soft ground improved to a certain extent,treated sludge layer water content in silt layer,void ratio and compressibility decreased respectively by 9.32%,6.59% and 2.68%;The wet density,φ,c and compression modulus were increased respectively by 1.09%,40.48%,10.02% and 13.53%.The field test results of vane shear strength showed that the depth of 15 m above the mud vane un drained shear strength of the average value increased by 25.9%.Through monitoring of the field settlement and test data of pore water pressure monitoring,the ground-average degree of consolidation of treated test area by vacuum combined with surcharge preloading for 110 days was 90% or below.Then the treatment measures need further optimize.