小硐室爆破在铁路扩线中的应用

Application of Small-chamber Blasting in Rallway Extension Engineering

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。

This paper describes the application of small - chamber blasting in railway extention cnginc cring at Qisong Rallway Station. For the safety of renning railway, the factors that should be considered synthetically in the small-chamber blasting include the features of geology and topog raphy, the location and dimension of the small-chamber, and the explosive charge which deals with the minimum burden(W), the ratio of the mimimum burden and rock height(W/A), the space between the chambers. The plugging quality of the small - chamber also is important for the effect of the small-chamber blasting.