大坪山隧址区地质构造对岩溶发育规律的影响

在野外地质调查的基础上,运用自然历史分析法和统计学对隧址区的地质构造和岩溶发育特征进行了研究。研究表明地质构造对隧址区岩溶发育的影响主要表现为:1推覆构造演化过程中,地层经历的抬升和稳定使得区内岩溶发育呈现多期性,垂直、水平溶蚀形态交替分布;2区内地质构造通过控制岩溶水的循环通道,从而控制区内岩溶发育的方向和规模;3区内大型岩溶形态发育的向深性和方向性受断层控制,同时发育规模也由节理裂隙密度决定;4褶皱核部及转折部位多形成张拉裂隙,岩溶发育强烈,翼部径流作用有利于岩溶发育。

Influence of Tectonics of Dapingshan Tunnel Site on Karst Development

Based on field geological investigations, the tectonics and karst development features in the tunnel site were studied by the natural history analysis method and statistic. Research shows that the tectonics in tunnel site has great influences on the karst development as follow: (1) the karst development in tunnel site is multi-stage and there is an alternant distribution of vertical and level solution morphology because the stratum rose and stabilized during the evolution process of nappe tectonics; (2) tectonics control the karst development in tunnel site by controlling the karst water cycle access; (3) the depth and orientation of large-scale karst morphological development in tunnel site are controlled by the faults and the scale is controlled by the density of joints and fissures; (4) karst development is strong in the core and twist of fold where tensile fracture grow and the runoff effect in limb of fold is conducive to karst development.