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为了保证铁路既有线的安全，小硐室爆破要考虑地质地形条件，对小硐室的位置和尺寸设计必须合理，药室装药量要综合最小抵抗线（W）、W／H比值、药空间距等因素来确定。施工中硐室堵塞质量也是影响爆破效果的重要因素。
In order to ensure the safety of existing railway lines, the blasting of small chambers must take into account the geological and geomorphological conditions, and the design and location of small chambers must be reasonable. The drug charge should be based on the minimum resistance line (W), W / H ratio Space and other factors to determine. The quality of chamber blockage in construction is also an important factor that affects the blasting effect.