Abstract
In practical engineering projects, overconsolidation plays an irreplaceable role in the calculation of silt consolidation settlement. Based on a series of systematic consolidation tests conducted on reconstituted soft clay in different cities of the Guangdong-Hong Kong-Macao Greater Bay Area, the overconsolidation behavior of soft clay under different depths was studied. According to these tests, the shape of the curves of the overconsolidation ratio with depth was similar to that of the compression curves. Moreover, the deeper the silt depth is, the smaller the overconsolidation ratio is. Hence, the overconsolidation state eventually changes to the underconsolidation state. On this basis, the depths of normal consolidation were calculated through the fitting curves of the overconsolidation ratio with depth by CurveExpert1.4, which is strongly dependent on both the average thickness of the overfill and the range of water level. Based on the results, a polynomial relationship between overconsolidation ratio (OCR) and sampling depth (h) is established. This study can serve as a basis for predicting the consolidation settlement of the silt layer more accurately in practical engineering applications.
Highlights
E ground collapse and settlement are mainly caused by the excessive deformation of the foundation, and the study of the overconsolidation characteristic of the silt layer becomes an important index in the field of foundation deformation research
Due to its special engineering properties, especially the overconsolidation characteristics, the silt layer has become the key object of research in the field of geotechnical engineering. e research history can be traced back to the early 1970s
E variation in overconsolidation ratio (OCR) with the depth is determined. is study can serve as a basis for predicting the consolidation settlement of the silt layer more accurately in practical engineering applications
Summary
With the construction and development of the Guangdong-Hong Kong-Macao Greater Bay Area, underground projects such as urban subways, intercity railways, long-span bridges, high-rise buildings, ports, and large heavy underground structures have entered a trend of development toward larger and deeper areas. E ground collapse and settlement are mainly caused by the excessive deformation of the foundation, and the study of the overconsolidation characteristic of the silt layer becomes an important index in the field of foundation deformation research. The research on the overconsolidation characteristics of regional soft soil has not been systematically studied and an appropriate calculation method to predict the overconsolidation ratio (OCR) under different depths (h) has not been put forward for the GuangdongHong Kong-Macao Greater Bay Area. Erefore, it is necessary to study the silt layer characteristics of overconsolidation in the Guangdong-Hong Kong-Macao Greater Bay Area. The characteristics of overconsolidation of 422 samples of silt layers from 17 projects (7 in Guangzhou, 3 in Shenzhen, 4 in Zhuhai, 2 in Zhongshan, and 1 in Jiangmen) of five typical cities of the Guangdong-Hong Kong-Macao Greater Bay Area are systematically studied. E variation in OCR with the depth is determined. is study can serve as a basis for predicting the consolidation settlement of the silt layer more accurately in practical engineering applications
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