Analysis and prevention of sinkhole collapses during the reconstruction and extension of Guang-Qing freeway, china

作者：Gu, Zhanfei; Liu, Qi^*; Lu, Yaoru; Shi, Zhenming; Su, Gaoyu; Luan, Dexiang

来源：Environmental Earth Sciences, 2016, 75(9): 788.

DOI：10.1007/s12665-016-5625-2

• Sinkhole collapses
• Prevention measures
• Formation conditions
• Guang-Qing freeway
• Reconstruction and extension project

The Guang-Qing freeway reconstruction and extension project is located in Guangdong province, China, extending from Guangzhou city to Qingyuan city. The total project length is 57.6 km, 33 km of which is in a karst area where sinkhole collapses are common. Therefore, there were concerns about the safety and security of the roadbed, bridge piles, and other structures associated with the original roadway. The study addresses karst development, covering layer (overburden), and external factors that contribute to catastrophic sinkhole collapse along the project. The study found that the formation of sinkhole collapses is affected significantly by the degree of karst development and soil characteristics, including thickness. Collapses may be triggered directly by external factors that disturb the natural equilibrium. Such factors include heavy rainfall that impacts soil and groundwater conditions, as well as vibration and groundwater flow disruptions that are caused by pile construction and other engineering activities. Prevention measures were adapted to local conditions and optimized based upon safety, reliability and cost-effectiveness.

• 出版日期2016-5
• 单位同济大学