The clear spacing of substituted bars shall conform to Chapter 6 of Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG D62-2004).
代用钢筋的净距应遵守《公路钢筋混凝土及预应力混凝土桥涵设计规范》（JTG D62-2004）第六章的规定。
In no more than two pages (1.5 spacing, 12pt font), craft a clear, concise, and comprehensive definition.
行距1.5倍、12级字，不超过2页，拟定一清楚、简洁、易解之定义。
Fracture spacing is an important fracturing phenomenon in crustal rock formation and geotechnical engineering structures, but its formation mechanism is not clear.
在地壳岩层或岩土工程结构中，有一个非常重要的破裂现象，即间隔破裂现象，其形成机制到目前仍不十分清楚。
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