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为了建立土石混填路基压实度确定新方法,在研究土石混填路基静力贯入变形力学机理的基础上,将贯入变形视为贯入形成的土石柱压缩变形及柱端沉降两部分,考虑到土石柱及柱端土石体被压缩导致其孔隙率和变形模量变化的特点,引进分级加载的思想,分别提出土石柱压缩变形及柱端沉降的计算方法,从而建立贯入变形与路基初始孔隙率的分析模型;依据静力贯入试验曲线,采用基于自适应的遗传模拟退火优化算法,建立初始孔隙率的反演分析方法;根据初始孔隙率与压实度的关系确定路基压实度,进而建立基于静力贯入的土石混填路基压实度新型确定方法;最后,通过工程实例分析了该方法的合理性与可行性。结果表明:该方法不仅可以确定土石混填路基压实度,而且可确定其他力学参数。
In order to establish a new method to determine the compaction degree of soil-stone mixed roadbed, on the basis of studying the mechanical mechanism of static penetration of soil-stone mixed embankment, the penetration deformation is regarded as the compressive deformation of soil column and the settlement of column Considering the characteristics of the change of porosity and deformation modulus caused by the compression of the earth and stone in the soil column and the column, the idea of staged loading is introduced to calculate the compressive deformation of soil column and the settlement of column end respectively, Based on the static penetration test curve, the genetic algorithm based on adaptive annealing optimization algorithm was used to establish the initial porosity analysis method. The subgrade pressure was determined according to the relationship between initial porosity and compaction degree And then establish a new method of determining the degree of compaction of soil-rock mixed embankment based on static penetration. Finally, the rationality and feasibility of the method are analyzed through engineering examples. The results show that this method not only can determine the compaction degree of soil-rock mixed embankment, but also can determine other mechanical parameters.