隧道工程围岩等级的综合判定

Comprehensive Judgment of Surrounding Rock Grade in Tunnel Engineering

隧道工程毛洞施工期间,围岩等级及时、准确的判定是毛洞安全支护、合理施工和隧道安全使用必不可少的条件。结合某在建隧道工程,利用经验判定、《标准》计算、巴顿方法计算和超前地质预报4种手段对围岩等级进行了综合判定,为及时调整支护设计和施工方案提供了依据。

During the construction period of unsupported hole of tunnel project ,it is an essential factor for the security support, reasonable construction and safe use of the hole to accurately judge the surrounding rock grade in time. In this paper,taking a project under construction as a case,the comprehensive judgment on the surrounding rock grade is made by four means as the empirical judgment, ＂standard＂ calculation, Barton computing method and the advance geological forecast. This provides a basis for timely adjusting the support design and the construction program.