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以西北某深基坑工程为例,通过采用有限元软件PLAXIS对该深基坑的初次支护及二次加固进行二维有限元数值模拟分析,得到加固前后的位移场变化规律,结合现场的实时监测数据对模拟分析进行验证.通过对比分析模拟结果和实测数据可知:加固后的基坑变形均控制在允许范围内;模拟结果和监测数据的良好吻合关系表明所采用的强化土模型非常合理;钢管桩加预应力锚杆的支护方式对于基坑加固具有明显的优势和适用性;实践证明该基坑二次加固方案合理,加固效果良好.
Taking a deep foundation pit project in the northwest of China as an example, by using finite element software PLAXIS, the two-dimensional finite element numerical simulation analysis of the first support and secondary reinforcement of the deep foundation pit was conducted, and the variation law of the displacement field before and after reinforcement was obtained. Real-time monitoring data to verify the simulation.Comparison of the simulation results and the measured data shows that the deformation of the foundation pit after reinforcement is controlled within the allowable range. The good agreement between the simulation results and the monitoring data indicates that the soil model used is very reasonable ; The steel pipe pile plus prestressed anchor support method has obvious advantages and applicability for foundation pit reinforcement; practice proves that the foundation pit secondary reinforcement plan is reasonable and the reinforcement effect is good.