【摘要】：研究目的:在建成蘭鐵路以復(fù)雜活躍的地質(zhì)構(gòu)造條件、極為顯著的地震效應(yīng)、高水平構(gòu)造應(yīng)力場(chǎng)特征及軟弱破碎的地層巖性等復(fù)雜的地質(zhì)條件為其地質(zhì)背景,強(qiáng)震區(qū)軟弱破碎圍巖隧道大變形現(xiàn)象較為普遍。本文在現(xiàn)場(chǎng)調(diào)繪、試驗(yàn)資料、變形監(jiān)控量測(cè)資料等分析的基礎(chǔ)上,從工程地質(zhì)環(huán)境、地層巖性、地質(zhì)構(gòu)造、地下水、地震及應(yīng)力場(chǎng)等方面,以工程地質(zhì)的角度,對(duì)強(qiáng)震區(qū)軟弱破碎圍巖隧道大變形的成因機(jī)制進(jìn)行分析研究。研究結(jié)論:(1)變形段處于汶川"5·12"強(qiáng)震區(qū)龍門山前山斷裂之彭縣-灌縣斷裂帶影響區(qū)內(nèi),圍巖震裂破碎效應(yīng)極為顯著;(2)大變形主要表現(xiàn)為初支拱頂下沉、邊墻侵限開裂、剝落、初支鋼架扭曲等破壞特征;(3)變形工區(qū)段受龍門山斷裂構(gòu)造及汶川"5·12"強(qiáng)震震裂影響嚴(yán)重,巖體中節(jié)理裂隙發(fā)育,變形破壞地質(zhì)成因機(jī)制可總結(jié)為:軟弱破碎的圍巖條件為大變形產(chǎn)生的物質(zhì)基礎(chǔ),復(fù)雜的高應(yīng)力場(chǎng)環(huán)境為大變形產(chǎn)生的力學(xué)條件,結(jié)構(gòu)面引起的順層偏壓現(xiàn)象和地下水的軟化特性等進(jìn)一步加劇了大變形;(4)變形工區(qū)段應(yīng)加強(qiáng)初支的監(jiān)控量測(cè)管理,及時(shí)進(jìn)行量測(cè)數(shù)據(jù)的反饋與分析,科學(xué)、準(zhǔn)確地評(píng)價(jià)大變形的成因機(jī)制;(5)本文的分析方法及結(jié)論對(duì)強(qiáng)震區(qū)類似工程地質(zhì)條件下軟弱破碎圍巖隧道大變形的設(shè)計(jì)及施工具有借鑒意義。
[Abstract]:The purpose of this study is to study the complex geological conditions of the Lanzhou Railway, such as complex and active geological structural conditions, extremely significant seismic effects, characteristics of high level tectonic stress field and weak and broken strata and lithology, etc. The large deformation phenomenon of weak and broken surrounding rock tunnel in strong earthquake area is common. Based on the analysis of field mapping, test data, deformation monitoring and measurement data, this paper discusses engineering geology from engineering geological environment, stratigraphic lithology, geological structure, groundwater, earthquake and stress field, etc. The mechanism of large deformation of soft and broken surrounding rock tunnel in strong earthquake area is analyzed and studied. The conclusions are as follows: (1) the deformation section is located in the Pengxian-Guanxian fault zone of Qianshan fault of Longmenshan in Wenchuan "512" strong earthquake area, and the fracture effect of surrounding rock is very remarkable. (3) the deformation zone is seriously affected by the Longmenshan fault structure and the Wenchuan "512" strong earthquake crack, and the joints and fissures are developed in the rock mass. The geological mechanism of deformation and failure can be summarized as follows: the weak and broken surrounding rock condition is the material foundation of large deformation, and the complex high stress field environment is the mechanical condition of large deformation. The phenomenon of bedding bias caused by the structure plane and the softening characteristics of groundwater further aggravate the large deformation. (4) the monitoring and measurement management of the initial support should be strengthened in the deformation working area, and the feedback and analysis of the measured data should be carried out in time. (5) the analytical methods and conclusions of this paper can be used for reference in the design and construction of large deformation of soft and broken surrounding rock tunnel under similar engineering geological conditions in strong earthquake area.
【作者單位】： 中鐵二院工程集團(tuán)有限責(zé)任公司地質(zhì)創(chuàng)新工作室;中鐵二院工程集團(tuán)有限責(zé)任公司;
【基金】：鐵道部科技研究開發(fā)計(jì)劃(Z2012-061) 中國(guó)鐵路總公司科技研究開發(fā)計(jì)劃項(xiàng)目(2013G014-B)
【分類號(hào)】：U452.11

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