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以武汉长江Ⅰ级阶地中海国际大厦超深基坑工程为研究背景,使用静压薄壁取土器对该场地软土地层进行取样,并结合室内土工试验、利用数理统计原理获取软土地层的抗剪强度指标,并与采用岩芯管取样所得到的(qq)抗剪强度指标进行对比。同时运用Midas GTS三维有限元软件开展对中海国际大厦超深基坑工程的三维数值仿真分析,主要研究了超深基坑地下连续墙水平位移及地层土压力的变化规律,并与实测数据进行对比分析。研究发现:使用静压薄壁取土器取样对地层的扰动较岩芯管取样小,得到的土体抗剪强度指标更为可靠;选取cu抗剪强度指标,地下连续墙水平位移和地层土压力更接近实测数据,cq指标次之。建议对于一级重要性等级的基坑首选cu指标,对于二、三级重要性等级基坑可采用cq指标。
Taking the ultra deep foundation pit project of Grade I Mediterranean International Building in Wuhan Yangtze River as background, the soft soil layer in this site was sampled by static pressure thin-walled earth miner. Combined with the indoor geotechnical test, Shear strength index, and with the core tube sampling obtained (qq) shear strength index for comparison. At the same time, using Midas GTS 3D finite element software to carry out 3D numerical simulation analysis of the ultra deep foundation pit project of the China Shipping International Plaza, the horizontal displacement of the diaphragm wall and the change of formation earth pressure are mainly studied and compared with the measured data analysis. The results show that the sample perturbed by the static pressure thin-walled earth borrower is smaller than the core sample and the shear strength index of the soil is more reliable. The cu shear strength index, the horizontal displacement of the diaphragm wall and the earth pressure Closer to the measured data, cq index followed. It is suggested that cu index should be the first choice of foundation pit for grade one and cq index for grade two and three grade of foundation pit.