在建设伦敦地铁Ｊｕｂｉｌｅｅ延长线时,采用新奥法修建了两个试验隧道:一个是直径为5.3ｍ、长50ｍ的区间隧道。在开始的20ｍ隧道施工中,未采用任何补偿注浆,地表沉降达50ｍｍ,在接着的30ｍ施工中,由于在隧道顶部进行了补偿注浆,地表沉降仅为10ｍｍ,结果令人满意。另一个?.. Two new test tunnels were constructed using the New Austrian law during the construction of the Jubilee extension of the London Underground: one is a section tunnel with a diameter of 5.3 m and a length of 50 m. In the initial 20m tunnel construction, no compensation grouting was adopted and the ground surface subsidence reached 50mm. In the following 30m construction, the surface settlement was only 10mm due to the compensation grouting at the top of the tunnel, and the result was satisfactory. another?..