长板短桩工法加固机理数值研究

Numerical study on reinforcement principle by D-M method

长板短桩工法是采用长的塑料排水板（或砂井）与短的水泥土搅拌桩联合的新型地基处理方法。作者依据淮盐高速公路盐城段第十四合同段K97＋461-K97＋561的试验研究，在比较了各种数值模拟计算方法的基础上，选用复合地基单元体方法，利用原位测试和土工实验得到的指标作为计算所使用的参数，以现场量测结果作为数值模型检验的依据，对长板短桩工法复合地基数值模型的合理性作进一步的探索和验证。

D-M method is a new ground treatment method, which combines long plastic drain board method and short cement mixing pile method. According to the test of the 14th segment K97 ＋ 461 - K97 ＋ 561 on Yancheng highway, the author compared many numerical methods, and chose the composite foundation unit method. Using the test data as calculating parameters, based on field experiment results, the numerical model＇ s rationality of D-M method was studied and the characteristic about additional stress was analyzed.