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为了研究采空区导致上覆复杂岩层运移致使公路路基沉降问题,以颗粒流理论为基础,通过下落法构建模型。根据煤层位置,假设了7种采空区长度进行模拟。模拟的结果为岩层应力、应变在不同情况下的最终状态,同时提出了影响区和松散堆积区的概念。结果表明,由于岩层构造复杂,在不同情况下主要影响区和松散堆积区的发展变化是不同的,特别是岩层4的作用较为特殊。根据公路路基设计规范,采空区只限于假设1和假设2的采空区范围内,路基沉降才能满足规范要求。
In order to study the settlement of roadbed caused by the overlying overlying strata caused by the mined-out area, the model was established by the drop method based on the particle flow theory. Based on the coal seam location, seven mined-out lengths are assumed for simulation. The result of the simulation is the final state of rock stress and strain in different situations, meanwhile, the concept of influence area and loose accumulation area is put forward. The results show that due to the complicated rock formation, the development and changes of the main influence area and the loose accumulation area are different under different conditions, especially the effect of formation 4 is rather special. According to the design rules of road embankment, the mined-out area is only within the gob area of Hypothesis 1 and Hypothesis 2, and the subgrade settlement can meet the requirements of the specification.