珠海横琴深厚软土固结沉降计算方法研究

Research on Calculation Methods for Consolidation Settlement of Deep Soft Soil in Hengqin, Zhuhai

摘要: 本文以珠海横琴新街坊项目大面积深厚淤泥软土为研究对象，采用太沙基一维固结理论计算其沉降，并与现场监测数据进行对比，发现软土的含水率、湿密度、孔隙比、压缩系数、压缩模量对沉降计算的影响更具有规律性，当土性较好时，公式计算结果与监测数据更为接近；从开挖时间方面进行分析，开挖0.5倍基坑深度、开挖基坑底、电梯井施工完成、挖完反压土等时间节点需特别注意。根据公式计算结果和现场监测数据的差距，分析其变化影响因素，对太沙基一维固结理论公式进行修正，修正后的沉降计算公式无须另行复杂的参数试验，方法简单实用，与现场监测数据吻合较好。

Abstract: In this paper, using the large-scale deep soft silty clay deposits in the Hengqin Xinjie Fang Project in Zhuhai as the research object, the one-dimensional consolidation theory of Terzaghi was applied to calculate the settlement and compare it with the field monitoring data. It was found that the moisture content, wet density, void ratio, compression coefficient, and compression modulus of the soft soil have a more regular impact on settlement calculation. When the soil properties are better, the calculated results of the formula are closer to the monitoring data. From the perspective of excavation time, special attention should be paid to time such as excavation at 0.5 times the depth of the foundation pit, completion of foundation pit bottom excavation, completion of elevator shaft construction, and completion of backfilling. Based on the analysis of the factors affecting the difference between the calculated results of the formula and the field monitoring data, the one-dimensional consolidation theory formula of Terzaghi was modified. The modified settlement calculation formula does not require additional complex parameter tests, and the method is simple and practical, showing good agreement with the field monitoring data.