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在广东沿海地区,深基坑支护常用的方法是采用人工挖孔桩作挡土支护结构,但由于广东地下水位较高,在淤泥质地基中,特别是对粉细砂质淤泥,采用人工挖孔桩作支护墙,其桩间连接位置常常产生漏水、渗水。由于长时间的渗漏,引起周边地下土体流失,导致边坡坍塌,造成较大损失。为保证工程施工,为后浇混凝土提供一个无渗漏水施工环境,同时节省投资,采用人工挖孔桩作挡土支护结构与帷幕止水注浆组成复合支护止水墙,已成功用于广州市某新村大型深基坑的支护处理。 该新村为3幢9层商住楼,下设一层地下室,这3幢均为楼房地下室整体结构。该处地质条件为泡水淤泥和粉细砂质淤泥,平均厚度为0.6～3.9m,含水率为:W=83.1％,e=2.81,c=14.6kPa,φ=8.70,地下水位标高0.6～
In the coastal areas of Guangdong, the commonly used method for deep foundation pit support is the use of manual digging piles as the retaining structure for retaining the earth. However, due to the high groundwater level in Guangdong, it is adopted in muddy foundations, especially for silty sand silt. Manual digging piles are used as supporting walls, and the joints between piles often produce water leakage and seepage. Due to the long-term leakage, the loss of the surrounding underground soil caused the collapse of the slope, resulting in greater losses. In order to ensure the construction of the project, a post-impregnated concrete is provided with a non-seepage water leakage construction environment, and at the same time, investment is saved. The artificial excavation pile is used as the retaining wall for supporting the retaining structure and the curtain water stop and grouting to form a composite supporting and sealing wall, which has been used successfully. Supporting treatment of a large deep pit in a new village in Guangzhou City. The Xincun is a three-storey commercial and residential building of 9 floors with a basement. These three buildings are the overall structure of the basement of the building. The geological conditions here are soaking water silt and silty sand silt with an average thickness of 0.6-3.9m, water content: W=83.1%, e=2.81, c=14.6kPa, φ=8.70, groundwater elevation 0.6-