复合地基单元体的有限元分析

Numerical Study of Reinforcement Principle Besed on D-M Method

结合目前地基处理方法的优缺点,提出搅拌桩和塑料排水板联合处理的方法,即长板短桩工法。为了对长板-短桩工法复合地基的数值模型的合理性作探索和验证,实施了塑料排水板、长板短桩和水泥土搅拌桩试验,根据试验参数,将整个复合地基中的某个单元体分离出来作为研究的对象,采用复合地基单元体法进行数值模拟。以现场量测结果作为数值模型检验的依据,验证了采用复合地基单元体的有限元分析方法可以模拟搅拌桩复合地基、塑料排水板地基以及长板短桩工法地基的固结沉降特性。模拟结果显示,不同方案的沉降值模拟与实测值曲线基本吻合,而平均固结度的对比曲线中,长板短桩段的模拟结果最好,因此该方法更适合长板短桩工法的数值分析。

D-M method is a new ground treatment tool which combines long plastic drain with short cement mixing method.To validate the numerical model＇ s rationality of D-M method, tests about plastic drainage, D-M method and cement mixing method was done. Using the test data as calculating parameters, the composite foundation unit method was adopted that one cell was separated horn the whole composite foundation as a research object.Comparing the field experiment results, the composite foundation unit method was validated that it can be used to simulate consolidation characteristics of cement mixing method, plastic drainage and D-M method.According to the simulation data, the settlement simulation value was basically in line with the measured value by different method, as for the average concretion, the simulation result of D-M method was most satisfied.So this method was more suited to simulate D-M method.