【摘要】：本文通過數(shù)值模擬研究了預(yù)切槽法在黃土隧道中的作用,通過對比隧道變形與預(yù)切槽結(jié)構(gòu)受力進(jìn)行對比,分析了預(yù)切槽法在黃土隧道中的適用性,為預(yù)切槽法在黃土隧道中的應(yīng)用提供了理論依據(jù)。主要工作與研究成果如下：(1)總結(jié)了軟弱圍巖隧道變形控制方法,要重視掌子面超前核心土在隧道變形中的作用,應(yīng)從超前支護(hù)、掌子面加固、腳部補強三個方面加強對于隧道變形控制。(2)通過與全斷面黃土隧道開挖方法相比,采用預(yù)切槽作為超前支護(hù),可以有效控制隧道洞周收斂、拱頂沉降和地表沉降,預(yù)切槽能夠減少隧道預(yù)收斂變形,但是對于掌子面擠出變形控制效果有限。(3)從隧道埋深、支護(hù)時機、開挖進(jìn)尺三個方面研究了采用20 cm與25 cm厚預(yù)切槽時,隧道變形規(guī)律與支護(hù)結(jié)構(gòu)受力,應(yīng)該保證支護(hù)結(jié)構(gòu)安全滿足要求,在隧道開挖時應(yīng)遵守“快挖、快支”的原則。(4)掌子面玻璃纖維錨桿加固參數(shù)(錨桿長度、錨桿搭接長度)是控制掌子面加固效果的關(guān)鍵措施,根據(jù)隧道預(yù)收斂變形范圍確定錨桿長度,根據(jù)掌子面破裂面長度確定錨桿最小搭接長度；在預(yù)切槽法中,鎖腳錨桿不能起到錨固作用。(5)根據(jù)掌子面變形規(guī)律,可以對掌子面加固范圍進(jìn)行優(yōu)化,當(dāng)加固范圍較小時,掌子面將發(fā)生大范圍變形,不利于掌子面穩(wěn)定性,采用8m加固范圍可以滿足要求。
[Abstract]:In this paper, the role of pre-shear groove method in loess tunnel is studied by numerical simulation, and the applicability of pre-shear groove method in loess tunnel is analyzed by comparing the deformation of tunnel with the force of pre-shear groove structure. It provides a theoretical basis for the application of pre-cutting channel method in loess tunnel. The main work and research results are as follows: (1) the control methods of tunnel deformation in soft surrounding rock are summarized, and the role of leading core soil in tunnel deformation should be paid attention to, and the advance support and the reinforcement of the palm face should be paid attention to. The three aspects of foot reinforcement strengthen the control of tunnel deformation. (2) compared with the excavation method of full-section loess tunnel, the pre-cutting groove can effectively control the convergence of tunnel surrounding the tunnel, the settlement of arch roof and the settlement of the surface of the tunnel, compared with the excavation method of full-section loess tunnel. The pre-shear groove can reduce the pre-convergence deformation of the tunnel, but the control effect of extrusion deformation on the palm surface is limited. (3) when 20 cm and 25 cm thick pre-shear groove is adopted, the tunnel depth, support opportunity and excavation scale are studied from three aspects: the depth of the tunnel, the time of support and the length of excavation. The deformation law of tunnel and the force of supporting structure should be guaranteed to meet the requirement of safety of supporting structure, and the principle of "fast digging, fast supporting" should be obeyed in tunnel excavation. (4) the reinforcement parameters of glass fiber bolt on the palm face (bolt length, length of anchor bar) should be observed. The bolt lap length is the key measure to control the strengthening effect of the palm face. According to the pre-convergence deformation range of the tunnel, the bolt length is determined, and the minimum lap length of the bolt is determined according to the length of the fracture surface of the palm face. (5) according to the deformation law of the palm face, the reinforcement range of the palm face can be optimized, and when the reinforcement range is small, the palm face will be deformed in a large range, and the anchor bolt will not be able to anchor the anchor in the pre-cutting slot method. (5) according to the deformation law of the palm face, the strengthening range can be optimized. It is not conducive to the stability of the palm surface, and the 8 m reinforcement range can meet the requirements.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.4

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