武汉长江Ⅰ级阶地深基坑变形与土压力实测研究

Field Measurement Research on Deformation and Earth Pressure of Deep Foundation Pit in Wuhan Yangtze River I Terrace

通过对武汉长江I级阶地中海国际大厦超深基坑工程地下连续墙水平位移及坑外土压力实测数据进行分析，研究了地下连续墙变形规律及土压力分布特征，并与朗肯极限主动土压力对比。研究表明：地连墙水平位移主要呈现弓形曲线，最大水平位移位置约在0．56～0．64倍基坑开挖深度范围；对于上部软弱黏性土，一级重要性等级基坑工程建议使用CLI抗剪强度指标，二级、三级重要性等级基坑工程亦可使用cq抗剪强度指标；对于下部砂性土，使用水土分算较水土合算更符合实测。

By analyzing the measured data of horizontal displacement of diaphragm wall and earth pressure in Wuhan Yangtze River level-I terrace Zhonghai ultra-deep foundation pit,this paper studies the deformation law of diaphragm wall and distribution model of earth pressure,and compares with Rankine limit active earth pressure. The study results show that horizontal displacement of diaphragm wall basically presented'drum'phenomenon. The location of maximum horizontal displacement is at 0. 56 ~ 0. 64 H; For upper weak sticky soil,it is proposed to select cu shear strength index for level one excavation,and cq shear strength index for levels 2 and 3 excavation; For sandy soil at lower part,the earth pressure is more closer to measured data by using soil-water divided calculation than soil-water joint calculation.