基坑回填分两种方式进行，第一种形式为下部回填，由于钢管支撑还未拆除，回填采用汽车运到基坑边缘，将土倒入基坑，人工摊铺，小型夯实机分层夯实；第二种形式为在拆除最上面一道支撑后，用推土机推土，人工配合机械分层对称夯实。钢管支撑随回填高度随填随拆，注意保持围护结构的稳定。
某地下停车场2层，在基坑砂石回填完成后，因连降暴雨，发生整体倾斜上浮。
Overall tilt and floating occur in a 2-story underground parking lot due to continuous heavy rainfall after completion of sand and gravel backfilling of foundation pit.
通过工程实例，阐述了砂砾混合集料在基坑大开挖回填中的应用。
Through the engineering examples, this paper expounds the application of the sand-gravel blended aggregate in the back-filling of the big-excavation of the foundation ditch.
应用推荐