冰水堆积体隧道围岩分级与支护力确定方法

Classification of Surrounding Rock and Support Force Determination of Ice Water Accumulation Tunnel

为定量评价冰水堆积体围岩参数,提出一种冰水堆积体围岩快速分级方法,并给出冰水堆积体的变形控制标准,主要包括:(1)根据规范的相关计算方法,结合国外相关规范与冰水堆积体的基本特性和地貌特征,对设计阶段围岩进行分级;(2)根据土体密实状态、细粒含量以及细粒含水率,对施工阶段围岩进行分级,将冰水堆积体分为3个基本等级,4个亚级;(3)根据地下水与围岩胶结情况提出最终的围岩分级;(4)基于冰水堆积体隧道围岩分级,计算了不同围岩等级下的围岩特性曲线以及隧道允许变形量,从而提出基于允许变形量的隧道支护力确定方法。研究成果可以为冰水堆积体隧道围岩的分级、支护力的确定等提供参考。

To quantitatively evaluate the surrounding rock parameters of ice water accumulation body,a rapid classification method of surrounding rock of ice water accumulation body was proposed,and the deformation control standard of ice water accumulation body was given,which mainly includes the following contents:(1)the surrounding rock was classified in the design stage according to the relevant calculation methods of specifications,combined with the relevant foreign specifications and the basic characteristics and geomorphic characteristics of ice water accumulation body.(2)According to the dense state of soil,fine particle content and fine particle water content,the surrounding rock in the construction stage was classified.The river ice water accumulation body was divided into three basic grades and four sub grades.(3)According to the cementation between groundwater and surrounding rock,the surrounding rock classification was put forward.(4)Based on the classification of surrounding rock of ice water accumulation tunnel,the characteristic curves of surrounding rock and the allowable deformation of tunnel under different surrounding rock grades were calculated,and the determination method of tunnel support force based on the allowable deformation was proposed.The research results can provide a new reference for the classification of surrounding rock and the support force determination of ice water accumulation tunnel.