开采沉陷影响下高速公路变形破坏的试验研究

Experimental Research on Deformation and Failure of Expressway Influenced by Coal Mining Subsidence

通过相似模型试验模拟,研究了煤矿开采沉陷影响下高速公路路基与路面的变形破坏规律,试验表明:路基随地表发生连续、渐变、有规律的变形,其内部发育的裂缝随工作面的推进逐渐闭合压实;路面破坏前与路基之间存在空区,路面内部有竖向裂缝发育。得出了路面与路基且与地表沉陷变形不一致的结论。并提出路面基层出现断裂是高速公路受开采沉陷影响发生破坏的标志,利用线弹性断裂力学理论推导出高速公路发生断裂破坏判据的力学计算式,解释了开采沉陷影响下高速公路变形破坏的机理。

The deformation and failure laws of expressway subgrade and pavement influenced by coal mining subsidence have been researched by the similar model experiment. The results showed that,the deformation of subgrade along with ground is continuous,gradually and regularly changed,and the developed cracks inside the subgrade will approach or even be compacted gradually with the working face advance; Before the failure of pavement occurs,the gap has been formed between pavement and subgrade and vertical cracks have been developed inside the pavement. In conclusion,subsidence of the pavement is not consistent with that of the subgrade and ground. It is put forward that roadbase fracture is the sign that the expressway is destroyed. The mechanical formulas as the fracture failure criterions of expressway have been derived for interpreting the deformation and failure mechanism of expressway influenced by coal mining subsidence by using linear elastic fracture mechanics.