深圳填海区基坑支护技术特点及现状

The Features and Present of Excavation Technologies in Shenzhen Reclamation Areas

通过47个基坑的调查研究,对深圳填海区的基坑支护技术现状进行了统计和分析。其结果表明:深圳填海地区基坑支护存在地质条件差、周边环境条件复杂等诸多困难;排桩支护是填海区应用较多支护手段,其中又属桩锚支护最多,但随着城市不断发展,填海区施工环境逐渐复杂化,对环境影响小的桩撑和撑锚混合支护的使用情况逐渐增多;填海造陆地区深大基坑多,基坑周边分段支护已是常规作法,有一定的经济性;新型的基坑支护技术在填海区也得到广泛应用,如各类新式锚杆技术、衡重式挡墙技术、超细水泥注浆技术等。同时提出,填海区存在的深大基坑土压力、淤泥的强度指标、地下水渗流等问题值得研究。

By investigation of 47 foundation pit,the present excavation technology in Shenzhen reclamation area is analyzed. Results show that the excavation practice in Shenzhen reclamation area faces bad geological and complex surrounding environment conditions and with many difficulties; Soldier piles is a common method in reclamation area,and the anchor-soldier piles is the most used. With the development of the city,the reclamation construction environment becomes even more complicated,and uses of strut-soldier piles and soldier piles mixed strut and anchor which impact the environment less increases. Reclamation area has lots of deep excavations,and piecewise standard practice surrounding the excavations is a common method already,which have certain of economy. A lot of new type technology of excavations has been widely applied in reclamation area,such as all kinds of new anchor technology,weighing retaining wall technology and the superfine cement grouting technique,etc. Put forward at the same time,some problems in reclamation areas,such as deep and large foundation pit soil pressure,silt strength index,groundwater seepage are worth researching.