中国某特长隧道主要工程地质特征

STUDY ON MAIN PROBLEMS OF ENGINEERING GEOLOGY OF A SPECAIL-LONG TUNNEL IN CHINA

该隧道全长１２７８０ｍ，是中国北方第一座特长隧道。隧道主要通过三迭系、二迭系紫红色软质砂岩、泥岩岩层。隧道与舒缓向斜构造斜交、张性、张扭性断裂和构造节理发育，水文地质复杂。泥质围岩具膨胀性。缓倾岩层易坍方、掉块，并存在有害气体及突水、突泥地质灾害的可能性。目前国内对泥质围岩膨胀性判别及复杂的水文地质问题还没有统一、成熟的预测、评价方法。为积累这方面的资料，本文就上述主要地质问题加以论述。

Certain tunnel, the first special--long tunnel in North China, is 12. 78km long. It passes mainly through the purple--color soft sandrock and mudstone in Triassic or Dyas Systems. The tunnel is obliquely crossed with gentle syncline. the tensile, tensile--twisting faults and structual joints are developed. Thus, its condition of hydrogeology is complicated.Themud surrounding rock has characteristic of expansibility. The gentle-slant rock may belandslip or drop, there any be some harmful gases, and the water and mud may ooze. Atpresent, there is no well-considered and united method to appraise and forecast the expansibility of the mud surrounding rock and the complicated hydrogeology problems.