Study On Large Cave-forming Conditions Of Shuanghe Cave Area In Suiyang,Guizhou

Sui Yang shuanghe cave national geological park is a complex huge dolomite cave system with particularity and uniqueness in our country.For the research of its forming conditions,the article uses methods based on the geochemical and mechanical property with the combination to analysis of the research,and to further enrich the karst cave.The main results are as follows:The bed thickness of large dolomite cave in Shuanghe area is bigger,strata are widespread with gypsolyte,development joint fissure.Though the slice and main elements of rock samples find that the microscopic crystals is relatively small,dolomite content is higher,CaO/MgO style slightly higher than normal dolomite,shown as the normal Marine dolomite;The caves on the fo rmation is closely related,deposited with stronger evaporation and much salty water,basically not affected by terrigenous components,and display for oxidation of drought climate environment.The trace element concentration degree is extremely low,not s uitable for exploitation.On the basis of all kinds of samples distribution patterns,rock samples were not affected by other impurity minerals,LREE and HREE's fractionation are not obvious,except for the Dafeng cave and Yinhe cave,the others curve expression is slightly to the left;The cave rocks have a tendency to lean the ?18O.The dolomite formed in the process of the participation of less organic carbon,and has been part of rock-reforming,and the prior calcite precipitation happens to the dripping water that in the overlying soil layer and the stratum,it's speculated that the dolomite being the middle-deep buried environment,and the prior calcite precipitation happens to the dripping water that in the overlying soil layer and the stratum;The physical damage amount of dolomite is relatively larger,which makes the caves are more likely to collapse.The volume of gypsiferous rocks will be expa nded when hydrolyzed with water,it dissolves the remaining space which can further increase the porosity of the rock,meanwhile dissolved increases the SO42-in the water,it helps to further promote the caves.There are more flint stripe and flint briquette of large dolomite cave in Shuanghe area,the silicide is relatively serious,and has the conditions of forming large cave.The research has shown that roof and floor of the caves have high compressive strength,the cavern stability is better.