山西万家寨引黄工程总干线湿陷性黄土工程地质特征及隧洞变形破坏的工程处理

ENGINEERING-GEOLOGICAL CHARACTERISTICS OF SUBSIDING LOESS ALONG MAIN LINE OF THE PROJECT OF DIVERTING WATER FROM YELLOW RIVER AT WANJIAZAI,SHANXI,AND ENGINEERING TREATMENT OF TUNNEL DEFORMATION AND FAILURE

山西万家寨引黄工程总干线隧洞穿过湿陷性黄土的洞段较多 ,其主要为上更新统风积黄土。通过野外地质调查和室内土工试验 ,查明其物理力学及变形特性 ,分析其湿陷特征及规律 ,论证了隧洞产生施工缺陷的原因 ,提出了合理的工程处理方案 ,确保输水畅通。

The tunnel of main line of the Project of Diverting Water from Yellow River at Wanjiazhai, Shanxi, passes largely through subsiding loess, which is mainly upper Pleistocene eolian loess. Field geological inverstigation and laboratory geotechnical test permitted us to understand the physical and mechanical properties and deformation of the subsiding loess. Analyzing the characteristics and regularities of the wet subsidence of loess, we discuss the causes for defects in construction of the tunnel and suggest a scheme of reasonable engineering treatment for ensure the unimpeded water flow.