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针对黄土地区深基坑的特点,结合具体土压力监测的工程实例,以西安市南门外某深基坑工程的长期监测数据为例,分析深基坑在施工过程中土压力的变化规律,得到一定的经验性规律:黄土基坑开挖具有一定的时间和空间效应,土压力变化在空间上与监测点埋深有关,埋深越大土压力值越大,在时间上与监测周期有关,呈先减小再增大再减小后趋于稳定的趋势,坑壁位移变化与监测点所处位置有关,基坑边角及坑角密集处监测点位移要明显大于远离坑角处位移,随时间保持增长,其增长率逐渐较小,最终趋于稳定。坑壁位移变化与土压力变化整体保持一致。
According to the characteristics of deep foundation pit in loess area and the concrete example of earth pressure monitoring, taking the long-term monitoring data of a deep foundation pit project outside the south gate of Xi’an as an example, the variation regularity of earth pressure in deep foundation pit during construction is analyzed, Some empirical laws are obtained: the excavation of loess foundation pit has some time and space effects, and the change of earth pressure is related to the depth of monitoring point in space. The larger the depth of earth pressure is, the larger the earth pressure value is and the time is related to the monitoring period , The trend of pit wall displacement is related to the location of the monitoring point. The displacement of the monitoring points at the pit corner and the pit corner dense place is obviously greater than that away from the pit corner , Maintained its growth over time, its growth rate gradually decreased and finally stabilized. The change of pit wall displacement is consistent with the change of earth pressure.