Tortoise shell network: ensure lining materials plasticity at all kinds of locations and increase toughness substantially molding lining.
龟甲网络：保证衬材在各种部位的可塑性，大幅增强成型衬里的韧性；
Research indicates that mortar and soil could be pressured into a stable lining structure through explosive lining. Free face is one of the important factors influencing shape of the lining shell.
研究表明，爆炸衬砌可以使砂浆和土壤形成稳定的衬砌结构，自由面是影响砌体形状的一个重要因素。
The effect of the compound figuration is then evaluated by measuring the shell stress, the layer gap and the lining circumferential strain during the hydraulic bulge.
通过试验测量其壳体应力、层间间隙、衬里环向应变来评价复合效果。
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