| 1. | It was shown that the changes in effective stresses induced by dewatering and seepage are the main factors causing settlement of ground surface
研究表明，基坑降水及由此引发的渗流使土中有效应力改变是基坑周围地表发生沉降的根本原因。 |
| 2. | By reducing the permeability of soil at the bottom of pit and selecting optimal dewatering depth , the settlement of ground surface can be well controlled
采用降低坑底土层渗透性的措施和选择最佳的降水深度能有效地控制坑外地表的沉降。 |
| 3. | The effects of pile group are analyzed with the plane strain fem , the results of which show great consistency with the monitoring data . thus , conclusion is drawn that the predicted settlement of ground surface is reasonable and correct
进行了平面应变有限元群桩效应分析，得到的变形规律与实测情况符合较好，预测的地面沉降精度较高，工后沉降满足工程要求。 |
| 4. | The results show that , as an auxiliary method to construct a tunnel , applying artificial freezing method to construct tunnel can satisfy not only the strength requirement of structures but also the requirement of settlements of ground surface
结果表明，采用人工冻结法作为一种辅助的施工方法，不但能满足施工过程中结构的强度要求，而且能满足环境沉降量的要求。 |
| 5. | Finally , the comprehensive study comes to the conclusion that the main reason for causing destruction of buildings in fushan is the inhomogeneous settlement of ground triggered by fault motion , and the inhomogeneous settlement of ground caused by fault motion is different from the inhomogeneous settlement of soft ground
最后，综合分析得出断层活动引起的地基不均匀沉陷是造成该市建筑破坏的主要原因，且断层引起的地基不均匀沉陷不同于一般软基不均匀沉陷。 |
| 6. | In this thesis , based on the principles of hydraulic mechanics and soil mechanics , the change of effective stress in soil mass and the settlement of ground surface induced by dewatering during excavation both in homogeneous soil and in layered soil were studied . analytical formulas for calculating the settlement and the others were derived under the assumption that the seepage induced by dewatering is one - dimensional and vertical
本文运用水力学和土力学的基本理论，在一维竖向渗流的假定下对均质土和成层土中基坑开挖降水引起的坑内外土中应力变化及周围地表沉降的计算方法进行了较深入的研究，推导了相应的地表沉降等计算公式。 |
