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基坑深度是基坑最重要的特征参数,对深度适当分级有利于基坑支护技术的交流与使用。大于4 m的基坑应定性为深基坑,可分别以4,6,13,18,23,30 m为标准,把深基坑深度划分为稍深、中深、颇深、甚深、特深、超深及极深7个级别,不同深级有相宜的基坑支护方法。从施工安全出发,2～4 m深的稍深基槽也应该纳入深基坑管理范围。基坑的规格也可按面积分级,分别以100,2500,10000,25000,50000 m2为标准,划分为微型、小型、中型、大型、超大型及巨型6个级别。文中最后对基坑及支护技术的发展前景进行了展望。
The depth of foundation pit is the most important characteristic parameter of foundation pit. Proper grading of depth is beneficial to the exchange and use of foundation pit support technology. The foundation pit larger than 4 m should be defined as deep foundation pit, and the depth of deep foundation pit can be divided into deep, middle, deep, deep, Deep, ultra-deep and deep 7 levels, different depth of appropriate pit supporting method. Starting from the construction safety, 2 ~ 4 m deep deep basins should also be included in the management of deep foundation pit. The size of the foundation pit can also be graded according to the area and divided into 6 levels of miniature, small-sized, medium-sized, large-scale, super-large and giant respectively by the standards of 100, 2500, 10000, 25000 and 50000 m2. Finally, the prospect of the development of foundation pit and supporting technology is prospected.