网状排水体负压下处理围堰袋装淤泥试验研究

Experimental Study on Treatment of Cofferdam Bagged Silt with Reticulated Drainage under Vacuum Preloading Condition

针对软土处理过程中竖向排水板弯折严重等问题,提出将絮凝剂技术与水平网状排水体联合真空预压处理袋装淤泥相结合的方法。测试了直排式排水体和新型水平网状式排水体处理后的淤泥的含水率、无侧限抗压强度和抗剪强度,并对絮凝剂的添加量对固结效果的影响进行了对比研究。试验结果表明:新型水平网状式排水体相比直排式排水体,可更有效提高土体的渗透性;添加0.3%的絮凝剂是提高固结效果的最佳配比;最终验证了新型水平网状排水体联合真空预压处理袋装淤泥围堰施工工艺的可行性和有效性。

Considering the serious bending of the vertical drainage plate in the soft soil treatment process,a method of combining flocculant technique with horizontal mesh drainage combination with vacuum pre-pressure treatment of bagged sludge was proposed.The water content,unconfined compressive strength and shear strength of the sludge treated by the straight drainage body and the new horizontal mesh drainage body were tested,and the influence of the added amount of flocculant on the consolidation effect was compared.The test results show that the new horizontal mesh drainage can effectively improve the permeability of the soil compared to the straight drainage.The addition of 0.3%flocculant is the best ratio to improve the consolidation effect.The feasibility and effectiveness were verified of the cofferdam construction technology of the new horizontal mesh drainage combination with vacuum pre-pressure treatment of bagged sludge.