真空-堆载联合预压法现场试验研究及机理探索  

Field Experiment and Improvement Principle of Vacuum Combined Surcharge Preloading Method

作　　者：彭劼[1] 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098

出　　处：《江苏科技大学学报（自然科学版）》2006年第1期20-26,共7页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(50379010)

摘　　要：结合杭金衢高速公路真空-堆载联合预压工程,进行了现场试验和资料分析研究,并对该方法的加固机理进行了深入的探索。研究表明真空预压能使地基产生较大的沉降速率,同时产生向内的水平位移,从而使真空-堆载联合预压比超载预压具有更强的抗失稳能力,侧向位移量和位移速率与荷载大小有明显的相关性。真空预压的加固深度主要是竖向排水体范围内,而真空-堆载联合预压法的加固深度则可根据堆载的附加应力比来确定。机理分析表明真空预压的直接作用范围可达地表以下18 m;真空预压期间地下水位下降,下降幅度小于2 m。Field experiment and research work were carried out in the Hang Jin Qu highway engineer ing. Results show that the vacuum preloading can cause more settlement velocity and more horizontal displacement into the foundation. Thereby, the improved foundation by the vacuum combined preloading is stabler than that by the surcharge preloading. The effective improveing depth is in the scape of PVD, and the effective depth of vacuum combined surcharge preloading is determined by the stress of surcharge. The effective improving depth of vacuum preloading is about 18m under the surface. The water table of underground water is descended with vacuum preloading, and the descend range is tess than 2m in this research.

关 键 词：真空-堆载联合预压 现场试验 加固机理 

分 类 号：TU473[建筑科学—结构工程]