| 摘 要： | In this paper according to the results of a great quantityof tests and numerical calculations,it is pointed out that thesurrounding rock with thickness of1/3 span has mechanicalcharacteristics of a thick flexural member in underground rockcave subjected to transverse blast loading.However,it ap-proaches the stress state of free field outside country rockand the equation of thick plate theory under the loading offree field pressure may be applied to the solution of this prob-lem.Therefore,the underground structure-country rock dynamicinteraction may be described by dynamic equations of flexuralmembers of thin plate and thick plate,which express linear andcountry rock respectively.The interaction force between theliner and country rock is expressed as contacting pressure func-tion q(x.t).By solving system of simultaneous equations,theanalytical solution for the dynamic analysis of arch-straightlinerincluding elastic half space interaction effect is givenand the analytical expression of function q(x,t)is o
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