Abstract:The urban construction has been in full swing for decades in China, and now the developed areas have entered the stage of high-quality development, which inevitably requires more and more reliable diaphragm wall schemes for foundation pit support. However, due to the ever-changing geological conditions, there are more and more emergencies. Taking the treatment of slot wall collapse of a diaphragm wall as an example, through the analysis of cost and effect, the treatment scheme of the event is introduced, which can provide a useful reference for similar projects.