贵州省夹岩水利枢纽猫场隧洞11+316处涌水突泥机理与处理措施

Mechanism of Karst Water and Mud Bursting at Pile No.11-316 of Maochang Tunnel of Jiayan Hydraulic Key Project in Guizhou Province

贵州西部地区是典型的岩溶峡谷区,山高谷深,碳酸盐岩大面积出露,经历多期地质构造运动后,岩溶极为发育。夹岩水利枢纽及黔西北供水工程是贵州省迄今为止最大的水利工程,隧洞长距离输水,并穿过复杂的岩溶区,面临一系列不良地质问题,是本项目的特点和难点,特别是涌水突泥问题尤为突出,给隧洞施工和设计带来了巨大的挑战。总干渠猫场隧洞桩号11+316处出现涌水突泥,主要成分为黏土及砂砾石层,层理性好。通过对该处涌水突泥机理分析,提出相应的处理措施建议,为处理类似工程地质问题提供借鉴。

The western Guizhou Province is located in typical karst gorge area with high mountains and deep valleys, there exists a great area of Archaean granitoid carbonate rocks, after multi-stage geological structural movements,karst is well developed. Jiayan hydraulic key and water supply project for the northwestern Guizhou Province is the biggest water conservancy engineering in Guizou Province to this day,water is conveyed in a long tunnel to cross over a complex karst area,facing a series of poor geological problems,which will be the difficulty of this project,especially outstanding in mud bursting,bring huge challenge to the tunnel construction and design. Karst water and mud bursting occurred at pile No. 11 ＋ 316 of the main channel Maochang tunnel,where the main contents were clay and sandy gravel layer with good stratification. By analyzing the mechanism of karst water and mud bursting in this place,corresponding treatment measures and suggestion were put forward,providing references for similar project geological issues.