DISCUSSION ON GEOLOGICAL HAZARDS AND MAJOR ENGINEERING GEOLOGICAL PROBLEMS IN THE MIDDLE PART OF THE NORTH-SOUTH ACTIVE TECTONIC ZONE, CHINA
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摘要:
甘肃天水等城镇和成兰交通廊道位于青藏高原东缘南北活动构造带中段，是中国东西部地质、地貌边界带，断裂活动性强，地震活动频繁。本文在区内地质资料收集分析和野外地质调查的基础上，从活动断裂、浅表层地质灾害、深埋隧道重大工程地质问题等角度，分析了甘肃天水等城镇和成兰交通廊道规划建设过程中可能遇到的工程地质问题，认为：研究区内对成兰铁路和甘肃天水等城镇具有重大影响的活动断裂带主要有15条，并对区域构造应力场具有重要影响，具有强震诱发背景；研究区内地质灾害极为发育，主要包括崩塌、滑坡和泥石流，地质灾害的发育分布受强降雨、地震和活动断裂影响大，并发育一系列古地震滑坡，部分崩塌和滑坡方量大，具有高位、高速远程等特征，已严重制约着城镇、铁路、公路等地面工程建设，危害严重；研究区内深埋长大隧道多且工程地质问题复杂，已经遇到并严重受高地应力、软岩大变形、涌水突泥和高地温等重大工程地质问题的影响，同时还存在活动断裂断错效应对深埋隧道和桥梁等重要工程设施的长期影响。针对上述工程地质问题，深入探讨了其发育分布规律，并提出了调查研究途径和解决办法，对区内重要城镇、重大工程规划建设具有一定的借鉴意义。
Abstract:The area of Tianshui cities group, Gansu, and the Chengdu-Lanzhou traffic corridors are located in the middle of the north-south active seismic belt, eastern Tibetan Plateau. The study area is a geological and geomorphic boundary zone between the eastern and western China, with strong tectonic activities and frequent earthquakes. Based on the analysis of geological data and field geological survey, focusing on active faults, shallow geological hazards and engineering geological problems of deep-buried tunnels, the engineering geological problems which would be encountered during the construction of the Tianshui cities group and the Chengdu-Lanzhou traffic corridors were summarized in this article. The results show that, there are 15 active faults with great significance to the seismic and regional tectonic stress field. The geological hazards are well developed in this area, including collapses, landslides and debris flows, and they are seriously affected by heavy rainfalls, earthquakes and active faults. Also, there are a series of ancient earthquakes-induced landslides. Some of the collapses and landslides are in large size group and with high position, long-runout and other characteristics, with serious harm, and they could seriously affected the construction of cities, towns, railways, highways and other surface construction. There are some long and deep-buried tunnels in the study area and with serious engineering geological problems, such as high geo-stress, large deformation of soft rock, gushing water and high ground temperature, and other major engineering geological problems, and there are potential existence of fault breaking along the active faults to the deep-buried tunnels, important bridges and other engineering facilities. At last, The methods to solve the above-mentioned engineering geological problems and some solutions are suggested.
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表 1 甘肃天水等城镇和成兰交通廊道沿线及邻区重要活动断裂特征与活动性一览表
Table 1. Characteristics and activity of important active faults in the study area and adjacent areas
编号 断裂名称及断裂分段特征 活动性质 活动时代 活动速率(VH-水平活动速率，Vv-垂直活动速率，mm/a) 与铁路或重点城镇的关系 1 龙门山前山断裂 江油-灌县断裂 逆冲兼右旋走滑 Q3~Q4 VH=5.0±，Vv≤0.5 与成兰铁路大角度相交 江油-广元断裂 右旋走滑/逆冲 Q1~Q2 VH=1.54 与兰渝铁路大角度相交 2 龙门山中央断裂 北川-映秀断裂 逆冲兼右旋走滑 Q3~Q4 VH=2.0~3.0，Vv=1.0± 与成兰铁路近于直交 茶坝-林庵寺断裂 南段走滑，北段逆冲 南段Q4，北段Q1-2 VH=1.0-5.0，Vv≤1.0 3 龙门山后山断裂 耿达-陇东断裂 逆冲兼右旋走滑 Q3~Q4 茂县-汶川断裂 右旋走滑/逆冲 Q4 VH=1.4±，Vv=0.5-0.9 与成兰铁路近于直交 平武-青川断裂 逆冲兼右旋走滑 Q3 VH=1.0±，Vv=0.5-0.7 4 岷江断裂 左旋走滑，走滑 Q4 VH≤0.2，Vv=0.37~0.53 与成兰铁路平行展布，与成兰铁路多次斜交 5 虎牙断裂 逆冲兼左旋走滑 Q4 VH=1.4~2.55，Vv=0.3~0.5 6 雪山梁子断裂 右旋走滑 Q3 与成兰铁路近于直交 7 龙日坝断裂 右旋兼逆断 Q4 VH=1~2，Vv=0.7 8 哈南-稻畦子断裂 左旋走滑兼逆冲 Q4 9 塔藏断裂 左旋走滑 Q4 VH=3.2~3.6，Vv=0.5~0.7 与成兰铁路大角度相交 10 迭部-白龙江断裂 左旋走滑兼逆冲 Q3~Q4 VH=5.0±，Vv=0.2~0.3 与成兰铁路近于直交 11 光盖山-迭山断裂 左旋走滑兼逆断 Q4 VH=0.51±0.13，Vv=0.49~1.15 与成兰铁路近于直交 12 临潭-宕昌断裂 左旋走滑兼逆冲 Q3~Q4 VH=2.0~2.5 与成兰铁路近于直交 13 礼县-罗家堡断裂 左旋兼正断 Q4 VH=0.64~1.25，Vv=0.24~0.47 穿越礼县县城 14 西秦岭北缘断裂 天水-凤凰山断裂 左旋兼正断 Q3~Q4 VH=2.1~2.8，Vv=0.4~0.7 穿越天水市区 甘谷-武山断裂 左旋走滑 Q4 VH=2.8 穿越甘谷县 漳县断裂 左旋走滑 Q4 VH=2.5 影响漳县和武山县 黄香沟断裂 左旋走滑兼正断 Q4 VH=2.3±0.2，Vv=0.28±0.08 与成兰铁路近于直交 15 马衔山断裂 左旋走滑 Q4 VH=2.5~3.0， 与成兰铁路大角度相交 
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