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深圳市罗湖区新建的金城大厦是由六座二十六层塔楼组成,基底压力达50吨/米~2。地基表层6～8米为新填土、淤泥和粉细沙层,其下为残积亚粘土和强风化岩层,未风化基岩则在地面下24～25米以下。经方案比较,采用了大直径挖孔桩基础,系用人工挖土成孔,逐段混凝土井圈支护的就地灌注桩,以强风化岩层为桩尖持力层。为了解强风化岩层的原位置极限承载能力和变形模量,进行了深层载荷试验。在地面下20余米处进行岩层载荷试验,技术难度较大,安全也成问题。经多种试验方案比较,采用了如下的试验方法:由千斤顶、高压油泵和控制器组成地面遥控加载系统。荷载则通过传感器传输到地面测
The newly built Jincheng Mansion in Luohu District, Shenzhen is composed of six 26-storey towers with a base pressure of 50 tons/m2. The surface of the foundation is 6 to 8 meters of new fill, silt and silty sand layer, with residual sub-clay and strong weathered rock formations below, and unweathered bedrock below 24 to 25 meters below the ground. By comparing the plans, a large-diameter digging pile foundation was used, and the artificial excavation was used to form the holes. Each segment of the concrete well loop supported the in-situ cast-in-place pile, and the strong weathered rock layer was the pile tip bearing layer. In order to understand the ultimate positional ultimate bearing capacity and deformation modulus of strong weathered rock, a deep load test was conducted. It is technically difficult to carry out rock load tests at more than 20 meters below the ground. Safety is also a problem. Comparing various test schemes, the following test method was adopted: The remote control loading system was composed of a jack, a high-pressure oil pump and a controller. Loads are transmitted to the surface by sensors