| This paper, analyzing mistakes or imperfections making serious geological disasters and causing casualties and enormous economical losses in the previous tunnel prospecting, found that these disasters are caused partly by lacking of inputs or depth of engineering geological prospecting. It proved the importance and the necessity of engineering geological prospecting in the tunnel project. According to production practice in the tunnel engineering geological prospecting and materials from reading and collecting, the author summarized that the application of tunnel engineering geological prospecting has strong focalization and adaptability with proved by several examples in this paper.(1) the selection of geological prospecting in different stages(initial-prospecting, detailed-prospecting)(2)the selection of geological prospecting in the deep-laid and shallow-laid of tunnel project(3)the selection of geological prospecting of tunnel projecting in different geological conditionsFinally, the author summed up main problems needing to be solved in tunnel engineering geological prospecting as follow:(1)differentiate stratum and find out the depth and thickness of different stratums in the tunnel section(2)find out geological structure and existence situation of fault, broken zone and weak plane(3)find out weathering level of bed rock to classify surrounding rock combining speed materials(4)differentiate stratum structure of the entrance of tunnel to judge the stability of it(5)find out existence situation and performance of ground water(6)situations of other harmful geological phenomenon In view of above problems and classification of surroundingrock, the author showed principles of rational choosing of methods in geological prospecting and counted disperse range of physical character parameter value in different petrosal character, getting achievements as follow:(1)summarization of effect, merits and demerits of different geological prospecting methods in the tunnel geological investigation (2)method selection and arrangement principle of tunnel engineering geologicalprospecting in different geological conditions and prospecting stages(3)According to previous experience and cases, the author concluded the物性parameters most in use ,and showed the basis of selecting geological prospecting methods in different geological conditions.It is expected that above achievements can be used for reference in the tunnel engineering geological prospecting to come. |
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