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| Study on the variation of the bottom resistance during sinking stage of super large caisson foundation |
| GUO Mingwei1，2，DONG Xuechao1，2，SHEN Kongjian3，WANG Shuilin1，2，LAN Gaojie1，4，CHEN Zhewen1，5 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Jiangsu Provincial Transportation Engineering Construction Bureau，Nanjing，Jiangsu 210004，China；4. School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan，Anhui 232001，China；5. School of Civil Architecture and Environment，Hubei University of Technology，Wuhan，Hubei 430068，China) |
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Abstract For reasonably determining the bottom resistance during sinking stage of super-sized caisson foundation，a method based on the data of the soil pressure on tread of foot blade is proposed. Based on the monitoring data during the sinking stage of the super-sized caisson foundation engineering of the main tower of Changtai Yangtze River Bridge，the bottom resistance of different zones within the bottom of the caisson foundation is calculated by the proposed method，and the distribution characteristics and variation of the bottom resistance are analyzed. At the same time，the scale factor of soil pressure on foot blade incline and soil pressure on tread of foot blade is studied. The analysis results of engineering practice show that in the process of caisson soil sampling from the internal area to the external area，the bottom resistance of inner bulkhead and inner partition walls decreases，while the bottom resistance of outer bulkhead and outer partition walls increases. The distribution characteristics and variation of the bottom resistance can actually reflect the global mechanical behavior of caisson foundation，which helps guide the safe sinking of the caisson foundation.
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2021, Vol. 40 
