【摘要】：甘肅天水等城鎮(zhèn)和成蘭交通廊道位于青藏高原東緣南北活動構(gòu)造帶中段,是中國東西部地質(zhì)、地貌邊界帶,斷裂活動性強,地震活動頻繁。本文在區(qū)內(nèi)地質(zhì)資料收集分析和野外地質(zhì)調(diào)查的基礎(chǔ)上,從活動斷裂、淺表層地質(zhì)災(zāi)害、深埋隧道重大工程地質(zhì)問題等角度,分析了甘肅天水等城鎮(zhèn)和成蘭交通廊道規(guī)劃建設(shè)過程中可能遇到的工程地質(zhì)問題,認為:研究區(qū)內(nèi)對成蘭鐵路和甘肅天水等城鎮(zhèn)具有重大影響的活動斷裂帶主要有15條,并對區(qū)域構(gòu)造應(yīng)力場具有重要影響,具有強震誘發(fā)背景;研究區(qū)內(nèi)地質(zhì)災(zāi)害極為發(fā)育,主要包括崩塌、滑坡和泥石流,地質(zhì)災(zāi)害的發(fā)育分布受強降雨、地震和活動斷裂影響大,并發(fā)育一系列古地震滑坡,部分崩塌和滑坡方量大,具有高位、高速遠程等特征,已嚴重制約著城鎮(zhèn)、鐵路、公路等地面工程建設(shè),危害嚴重;研究區(qū)內(nèi)深埋長大隧道多且工程地質(zhì)問題復(fù)雜,已經(jīng)遇到并嚴重受高地應(yīng)力、軟巖大變形、涌水突泥和高地溫等重大工程地質(zhì)問題的影響,同時還存在活動斷裂斷錯效應(yīng)對深埋隧道和橋梁等重要工程設(shè)施的長期影響。針對上述工程地質(zhì)問題,深入探討了其發(fā)育分布規(guī)律,并提出了調(diào)查研究途徑和解決辦法,對區(qū)內(nèi)重要城鎮(zhèn)、重大工程規(guī)劃建設(shè)具有一定的借鑒意義。
[Abstract]:Tianshui and Cheng-lan traffic corridors in Gansu Province are located in the middle of the north-south active tectonic belt in the eastern margin of the Qinghai-Tibet Plateau. They are the geological and geomorphologic boundary zones of eastern and western China, with strong fault activity and frequent seismic activity. Based on the collection and analysis of geological data in the area and field geological survey, this paper deals with active faults, shallow surface geological hazards, and major engineering geological problems of deep buried tunnels, etc. This paper analyzes the engineering geological problems that may be encountered in the planning and construction of towns such as Tianshui and Cheng-lan in Gansu Province, and considers that there are mainly 15 active fault zones in the study area which have great influence on Cheng-Lan railway and Tianshui, Gansu, etc. It has important influence on the regional tectonic stress field and has strong earthquake induced background. The geological hazards in the study area are extremely developed, mainly including collapses, landslides and debris flows, the development and distribution of geological hazards are greatly affected by heavy rainfall, earthquakes and active faults, and a series of paleoearthquake landslides, some of which are large in quantity. It has the characteristics of high position, high speed and long distance, which has seriously restricted the construction of urban, railway, highway and other ground engineering, and caused serious harm. There are many deep buried long tunnels and complex engineering geological problems in the study area, which have been seriously affected by such major engineering geological problems as high ground stress, large deformation of soft rock, water gushing and mud outburst and high ground temperature, etc. At the same time, there is a long-term effect of active fault effect on deep buried tunnels and bridges and other important engineering facilities. In view of the above engineering geological problems, this paper probes into the law of its development and distribution, and puts forward the investigation and research ways and solutions, which can be used for reference for the planning and construction of important cities and towns in the region.
【作者單位】： 中國地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所;國土資源部新構(gòu)造運動與地質(zhì)災(zāi)害重點實驗室;中國地質(zhì)環(huán)境監(jiān)測院;中鐵二院工程集團有限責(zé)任公司;
【基金】：中國地質(zhì)調(diào)查局項目(DD20160271) 國家自然科學(xué)基金項目(41402321,41731287)
【分類號】：P642;P694

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