在电化铁路复线并肩条件下的石方开挖中,最关键的技术目标是:既要绝对保证既有线 的正常行车与安全，又要满足施工速度要求。为此本文将各种可行的开挖方案作了归纳,并对每种 方案的技术要点、适用范围、效果作了介绍，可供在各种不同条件下选择。

As excavating stoneworks under the condition of the electrified railway with dou?ble tracks side by side,the key technical objectives are： both the proper operation and safety of the existing line should be guaranteed absolutely，and the requirements on the speed of construction should be fulfilled also. The paper sums up the various feasible excavating schemes and introduces their technical essentials，effects and application scopes. These schemes can be selected under different conditions.