Consolidation Grouting Stone In The Protection Of Cultural Heritage Sites Of Yungang Grottoes Research

Among the many caves in Yungang Grottoes, Wuhua Yungang Grottoes is the mostbeautiful cave carved caves group, has the very high artistic value andhistorical value, is also an important place for visitors to watch, very attractsb.’s attention. However, the effects of long-term natural force function, theYungang Grottoes rock water damage. Water seepage disease the grotto rock wetchange, accelerated the rock weathering, weathering of stone carving statuesof the lower part of the damage zone. Cutting seepage tectonic fissures andweathering of the unloading fissures, reduces the stability of rock mass causedby the collapse of the stone, the grotto is very serious. At present, ninth,10, front row column weathered cave12serious, has threatened to grotto’s safety,the need for timely take measures to control protection.Therefore, the Wuhua cave rescue governance, in caves, comprehensive,detailed system of Surveying and mapping, surveying, research work, the rockbody disease, carving weathering, formulate rescue protection engineeringdesign.The main research contents of project: the consolidation grouting technologyfor design and construction of Yungang Grottoes Wuhua hole stone cultural relicsof national key cultural relics protection when the object, due to timelinessproblems force variation and grouting reinforcement of bolt, study materialsand related technology of grouting reinforcement.Yungang Grottoes area Grottoes carved on the Shili River in three majorterraces in the sandstone lens, due to the difference in the nature of long-termexposure, the comprehensive effects of various camp nature the rock developedin different types and degrees of damage caused by many reasons, disease,involving a wide range and complex, there are many types of damage. After thescene investigation, at present Wuhua caves in the region there are two mainproblems: namely the weathering of rock mass damage and local rock mass failure(rock) problem.Grotto rock reinforcement, including the evaluation of stability ofdangerous rock reinforcement technology and strengthening grouting materialchoice of three aspects of dangerous rock mass. On the stability coefficientstability evaluation of grotto rock mass using the limit equilibrium theory to calculate the grotto rock, as the evaluation index. In recent years theapplication of three dimensional finite element method to stability grotto rockevaluation has also made a number of important results. Because the designinvolving dangerous rock body smaller, rock mass unstable failure modes, thetheory of limit equilibrium calculation and evaluation of dangerous rock massstability and easy enough to meet the requirements, so the design adopts thetheory of limit equilibrium stability evaluation of rock body.The reinforcement design of the reinforcement technology of fracturegrouting is adopted, hydraulic or pneumatic method will solidification liquidinto a reinforcement technology of rock mass fracture and pore in the physicaland mechanical properties, can improve working object, to improve the crack rockmass integrity, enhanced stability against sliding and sealing, filling water,to prevent further erosion the deterioration of performance, stable function.The key technology mainly includes two aspects of selection of slurry groutingmaterial and grouting construction technology.