Method for preventing sudden subsidence of open caisson in soft foundation

A method for preventing sudden subsidence of an open caisson in a soft foundation, comprising the following steps:

• S1, determining a position of the open caisson;
• S2, carrying out grouting to reinforce a foundation of the open caisson, and the foundation of the open caisson being located at a bottom of a wall of the open caisson;
• S3, levelling an open caisson manufacturing site;
• S4, manufacturing and installing sections of the open caisson, comprising:
• manufacturing sections of the open caisson, and fixedly installing bearing units on the inner sides of the upper parts of the sections;
• enabling the first section to subside;
• calculating the mass of the second section, placing a load with the same weight as the section on the bearing unit of the first section, and pre-pressing the first section for 24 h with the load;
• if the first section has no obvious sudden subsidence, taking out the load, and installing the second section by subsidence;
• and
• if the first section has sudden subsidence, re-adjusting a construction solution;
• and
• S5, repeating S4 until all the sections are manufactured and the open caisson subsides in place as a whole.