本文選題：軟巖隧道 + 有限元�。� 參考：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：軟巖大變形影響因素多,軟巖隧道在支護參數(shù)方面不存在統(tǒng)一的、合理的設(shè)計經(jīng)驗可供直接借鑒。本文以牡綏線雙豐隧道工程為研究對象,根據(jù)雙豐隧道DK466+565里程段具體的軟巖變形及支護結(jié)構(gòu)特性,結(jié)合現(xiàn)場的監(jiān)控量測試驗,應(yīng)用MIDAS及ANSYS有限元分析軟件對該隧道支護參數(shù)進行優(yōu)化研究,主要研究內(nèi)容如下:(1)隧道施工過程中的監(jiān)控量測。通過監(jiān)控量測反饋的信息指導(dǎo)施工,對隧道的施工過程施行動態(tài)管理,在軟弱圍巖條件較差的地段加強監(jiān)控,確保施工安全。(2)圍巖參數(shù)的位移反分析。根據(jù)現(xiàn)場監(jiān)控量測數(shù)據(jù),用Excel軟件根據(jù)最小二乘法原理對現(xiàn)場監(jiān)測數(shù)據(jù)進行曲線擬合,預(yù)測位移最終值。然后,利用基于MATLAB的BP神經(jīng)網(wǎng)絡(luò)對圍巖力學(xué)參數(shù)進行反分析計算,并驗算反演結(jié)果的精度。(3)雙豐隧道支護參數(shù)優(yōu)化。結(jié)合雙豐隧道具體的施工方法及支護設(shè)計,利用MIDAS-GTS有限元分析軟件,采用地層—結(jié)構(gòu)模型對影響圍巖及支護結(jié)構(gòu)穩(wěn)定性的因素進行分析,主要優(yōu)化內(nèi)容包括鎖腳錨管的長度、噴射混凝土的標號和厚度、鋼拱架的型號和間距,以及利用ANSYS有限元分析軟件,采用荷載—結(jié)構(gòu)模型對雙豐隧道二次襯砌不同厚度進行內(nèi)力計算,通過對數(shù)值模擬的結(jié)果進行對比分析,對雙豐隧道支護參數(shù)進行優(yōu)化。研究結(jié)果表明:①鎖腳錨管的長度越長,對控制圍巖收斂變形和支護結(jié)構(gòu)受力有益,綜合改善的效果和受力來看,鎖腳錨管取5.0m。②噴射混凝土的標號及厚度越大,圍巖穩(wěn)定性越好,支護應(yīng)力也增大,其選擇也要結(jié)合具體的圍巖情況,最終選擇30cm厚的C30噴射混凝土。③鋼拱架間距對圍巖穩(wěn)定性及支護受力影響較大,鋼拱架型號越大,間距越小,對圍巖收斂控制效果越好,但相對支護應(yīng)力越大,最終選擇0.6m間距的I22a鋼拱架。④根據(jù)各工況的數(shù)值模擬結(jié)果得到的圍巖收斂變形值,結(jié)合監(jiān)控量測數(shù)據(jù),確定隧道施工的預(yù)留變形量為15cm。⑤二次襯砌結(jié)構(gòu)厚度太小,關(guān)鍵部位的抗裂性能較差,在滿足設(shè)計和運營的要求下選擇50cm厚的二次襯砌。
[Abstract]:There are many factors affecting the large deformation of soft rock, and there is no uniform supporting parameter in soft rock tunnel. The reasonable design experience can be used for reference directly. Based on the soft rock deformation and support structure characteristics of the DK466 565 mileage section of Shuangfeng Tunnel, this paper takes Shuangfeng Tunnel Project of Musui Line as the research object, and combines the site monitoring and measurement test. MIDAS and ANSYS finite element analysis software are used to optimize the supporting parameters of the tunnel. The main contents of the research are as follows: 1) Monitoring and measurement in the construction process of the tunnel. Through the information of monitoring and measuring feedback to guide the construction, the dynamic management of the tunnel construction process is carried out, and the monitoring is strengthened in the section where the condition of the weak surrounding rock is poor, so as to ensure the construction safety and the displacement back analysis of the surrounding rock parameters. According to the field monitoring and measuring data, the field monitoring data are fitted by Excel software according to the principle of least square method, and the final displacement value is predicted. Then, BP neural network based on MATLAB is used to calculate the mechanical parameters of surrounding rock, and the accuracy of the inversion results is checked. 3) the support parameters of Shuangfeng tunnel are optimized. Combined with the concrete construction method and support design of Shuangfeng tunnel, the factors affecting the stability of surrounding rock and supporting structure are analyzed by using MIDAS-GTS finite element analysis software and the stratigraphic structure model. The main optimization contents include the length of anchor pipe with locking foot. The number and thickness of shotcrete, the type and spacing of steel arch frame, and the internal force of the secondary lining of Shuangfeng tunnel are calculated by using the ANSYS finite element analysis software and the load-structure model. By comparing and analyzing the results of numerical simulation, the support parameters of Shuangfeng tunnel are optimized. The research results show that the longer the length of the anchor pipe with the lock foot is, the more beneficial it is to control the convergence deformation of surrounding rock and the force of the supporting structure. In view of the comprehensive improvement effect and force, the bigger the label and thickness of the 5.0m.2 shotcrete is, the bigger the number and thickness of the lock foot anchor pipe is. The better the surrounding rock stability is, the greater the support stress is, and the selection of the support stress should be combined with the concrete surrounding rock condition. Finally, the 30cm thick C30 shotcrete steel arch spacing has a greater influence on the surrounding rock stability and the supporting force, and the larger the steel arch frame model is, The smaller the spacing, the better the control effect on surrounding rock convergence, but the greater the relative support stress, the final selection of 0.6 m spacing I22a steel arch frame .4 according to the numerical simulation results of various conditions of surrounding rock convergence deformation value, combined with monitoring measurement data, It is determined that the reserved deformation amount of tunnel construction is that the thickness of 15cm.5 secondary lining is too small and the crack resistance of key parts is poor. The secondary lining with 50cm thickness is chosen under the requirements of design and operation.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.7

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