Shield-roof adaptability evaluation method based on coupling of parameters between shield and roof strata

Based on the dynamic instability of deformation between shield and surrounding rocks,the coupling relation- ship of stiffness,strength,and stability between shield and surrounding rocks was analyzed. An evaluation model for shield-rock adaptability was established using a composite parameter. The methods for acquiring the evaluation param- eters and the evaluation flow sheet were studied. The results show that the dynamic load which was formed in the process of roof weighting is impacted by the roof weight and the roof motion space. The roof fracture location is impact- ed by the stiffness of support,immediate roof and seam floor,which reduce the impact load from roof to support. The key factor to maintain the balance of support and rock was the three dimensional protection device in support. The pre- cedence relation matrix of evaluation index was confirmed based on the requirement of different seams. The compre- hensive evaluation index of support and rock was calculated by fuzzy comprehensive judgment matrix. Some improve- ment of support design can be achieved through analyzing the evaluation result.