基于真空预压法的淤泥质吹填土地基强度检测

Strength Testing of Silt Hydraulic Soil Foundation Based on Vacuum Preloading

鉴于淤泥质吹填土天然强度低,难以满足工程建设需要,而利用真空预压法加固淤泥质吹填土后,不同地基检测方法对承载力的评价影响较大。以浙江省某实际工程为例,通过土工试验、十字板强度测试和平板载荷试验三种方法对真空预压加固后的地基承载力特征值进行检测。结果表明,十字板强度测试的检测结果最低,推荐作为检测淤泥质吹填土地基承载力的方法;真空预压后,淤泥质吹填土地基的承载力特征值约为35kPa,若要进一步提高承载力特征值,可采用排水晾晒或堆载预压等其他处理方法。

Silt hydraulic soil with low natural strength is difficult to meet the needs of engineering construction. After reinforcing the silt hydraulic soil by vacuum preloading, the evaluation of the foundation bearing capacity is depend on dif- ferent foundation test methods. Taking an actual project in Zhejiang Province for an example, geotechnical test, vane strength test and plate loading test were used to analyze the characteristic value of foundation bearing capacity reinforced by vacuum preloading. The results show that the value of vane strength test is the lowest, which is recommended as the test method of foundation bearing capacity of silt hydraulic soil. The characteristic value of foundation bearing capacity will be about 35 kPa when the silt hydraulic soil is reinforced by vacuum preloading. To further improve the characteristic value of foundation bearing capacity, dry drainage or surcharge preloading and other ways can be adopted.