膨胀土系指主要由强亲水性矿物组成的粘粒成份并具有较大胀缩性能的土。这种粘土有吸水膨胀、失水干缩的特性。修建在膨胀土上的房屋,如果基础处理不好,会产生如砖墙开裂、墙身外倾、地坪坍陷、基础圈梁及墙通裂等破坏,危及安全。 近几年来,我们在云南曲靖膨胀土地区,采用爆扩桩基础修建四栋共约2,000米~2的宿舍。 Expansive soil refers to the clay mainly composed of strongly hydrophilic minerals and has a larger swelling properties of soil. This clay has the characteristics of water swelling, water loss and dry shrinkage. Houses built on expansive soil may cause damage such as cracking of brick walls, outward caving of walls, collapse of floors, collapse of foundation girders and wall cracks, which may endanger the safety of houses. In recent years, in the expansive soil area of ​​Qujing, Yunnan, we built four dorms of about 2,000m ~ 2 with the foundation of the expanded piles.