Comparative analysis on performance of vertical drain improved clay deposit under vacuum or surcharge loading |
| |
Authors: | Zhen Zhang Guan-Bao Ye Yan Xu |
| |
Affiliation: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Key Laboratory of Land Subsidence Monitoring and Prevention of Ministry of Land and Resources of China, Shanghai 200072, China |
| |
Abstract: | This paper presents two well-instrumented large-scale field tests of PVD-improved soft soil with vacuum and surcharge preloading, respectively. The two large-scale field tests were conducted adjacent to each other with the same preload. A comparative analysis was performed to investigate the performance of subsoil (i.e., the ground settlement, the layered settlement, the lateral displacement of subsoil and pore water pressure) under vacuum preloading and equivalent surcharge preloading. Some design methods were verified based on the field data. Cone Penetration Tests (CPT) and Vane Shear Tests (VST) were conducted to assess the improvement effects on subsoil after preloading. The results showed that as compared with surcharge preloading, vacuum preloading mitigated the differential settlement of the ground. The vacuum pressure transmitted into the soil with a minor loss through the PVD length. From a practical point of view, the improvement effects by vacuum preloading and surcharge preloading were similar in terms of influence depth and soil strength based on the in-situ tests. |
| |
Keywords: | Geosynthetics Vacuum preloading Surcharge preloading Prefabricated vertical drain Clay deposit Pore water pressure |
本文献已被 ScienceDirect 等数据库收录! |
|