Open AccessAnalysis on deformation characteristics of Hengli Island soft strata by vacuum preloading
Author(s) -
Xuesong Li,
Yongzhi Li
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/783/1/012055
Subject(s) - geology , attenuation , settlement (finance) , displacement (psychology) , geotechnical engineering , deformation (meteorology) , vertical displacement , stress (linguistics) , geomorphology , optics , physics , psychology , linguistics , oceanography , philosophy , world wide web , computer science , payment , psychotherapist
The deformation monitoring value of Hengli Island soft strata by vacuum preloading was analyzed. The results show that the vertical settlement and lateral displacement of strata mainly occur in the first 20 days. The negative pressure attenuation at different positions is quite different, and the average negative pressure attenuation rate with depth is about 3.2kPa/m. The difference of additional stress by the overlying water leads to the average settlement of the central area of the preloading area is greater than that of the marginal area. The settlement calculation results of Layered Summation Method are basically consistent with the measured values. According to the lateral displacement law of different projects, it is concluded that the lateral displacement has a progressive relationship with the vacuum preloading area half width, the prefabricated vertical drains (PVDs) length and the vertical settlement ratio of about 10 times, and the calculated value of lateral displacement agrees well with the measured value.