岩溶隧道地质构造与围岩等级的划分

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Abstract Research purposes: The grade division of carbonate rock is often confused with the insoluble rock and its grade division is often relatively low． The new orientation and evaluation of rock grade and stability of carbonate rock are made by doing the polarizing appraisal and mechanics test of the rock sampled in the fault zone and influence scope along with using the engineering geological survey data for tunnel construction．

Research conclusions: As the carbonate rock is affected by the fracture structure，its strength is related to the fracture distance． Although the rock strength is much reduced，the rock integrity is still good due to the cementation of calcite． So the grade division of the surrounding rock of karst tunnel may be higher than that of the insoluble rock． As the karst geological disaster area and carbonate rock of karst tunnel are abrupt，the special design should be made for streng thening them．

Key words： karst tunnel geological structure polarizing appraisal mechanical analysis grade of surrounding rock

Received: 03 November 2011

PACS:

U25

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I4/6

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