本文選題：偏壓 + 模型試驗(yàn)��； 參考：《河北建筑工程學(xué)院》2017年碩士論文

【摘要】：隨著我國交通事業(yè)的迅猛發(fā)展,公路隧道的建設(shè)規(guī)模和數(shù)量日益增多。在隧道工程中,由于地形的復(fù)雜性和地質(zhì)構(gòu)造的不確定性,隧道往往處于偏壓狀態(tài)。為了研究地表傾角和隧道埋深對(duì)隧道圍巖穩(wěn)定性的影響,本文以洞跨10m、洞高7m的隧道為研究對(duì)象,采用模型試驗(yàn)和數(shù)值模擬的方法開展了研究工作。為淺埋偏壓條件下隧道穩(wěn)定性的判斷和施工提供了參考。主要研究結(jié)論如下:(1)模型試驗(yàn)中測(cè)得應(yīng)力變化量在隧道0倍洞跨處最為明顯,隧道拱腳部位應(yīng)力變化程度比拱腰部位小。當(dāng)?shù)乇韮A角大于30°時(shí),兩側(cè)拱腰處應(yīng)力變化顯著,地表傾角30°是隧道偏壓趨勢(shì)變得明顯的轉(zhuǎn)折點(diǎn);隨著隧道埋深增加,隧道兩側(cè)拱腳處應(yīng)力值增加,兩側(cè)變化趨勢(shì)逐漸趨于一致,當(dāng)埋深超過25m時(shí),左拱腰部位的應(yīng)力開始減小,隧道兩側(cè)應(yīng)力變化量趨于對(duì)稱。(2)隨著地表傾角的增加,隧道偏壓效用逐漸增強(qiáng),當(dāng)?shù)乇韮A角大于等于30°時(shí),隧道的偏壓作用變得明顯,必須重視偏壓的影響;隨著隧道埋深的增加,隧道左右兩側(cè)圍巖受力及位移分布特征逐漸趨于一致,當(dāng)隧道埋深超過25m時(shí)隧道受到的偏壓作用明顯減弱,但隧道仍受到偏壓作用的影響。(3)對(duì)地表傾角為30°的V級(jí)圍巖隧道,中隔壁法施工對(duì)于限制圍巖變形、減小塑性區(qū)范圍效果最好,留核心土法次之,臺(tái)階法效果最差,中隔壁法施工會(huì)弊端是中隔壁施工較為繁瑣,開挖一側(cè)后需要安裝臨時(shí)支護(hù)結(jié)構(gòu),造成工期延長。
[Abstract]:With the rapid development of transportation in China, the construction scale and quantity of highway tunnels are increasing day by day. In tunnel engineering, because of the complexity of topography and the uncertainty of geological structure, the tunnel is often in the state of bias. In order to study the influence of surface inclination and tunnel depth on the stability of tunnel surrounding rock, this paper takes the tunnel with 10 m span and 7 m high as the research object, and adopts the method of model test and numerical simulation to carry out the research. It provides a reference for tunnel stability judgement and construction under the condition of shallow buried bias voltage. The main conclusions are as follows: (1) in the model test, the variation of stress is the most obvious at the span of the tunnel 0 times, and the variation of stress at the arch foot is smaller than that at the waist of the arch. When the local surface inclination angle is greater than 30 擄, the stress at both sides of the arch waist changes significantly, and the surface inclination angle of 30 擄is the turning point of the tunnel bias trend, and with the increase of the buried depth of the tunnel, the stress value at the arch foot of both sides of the tunnel increases. When the depth of burying is more than 25 m, the stress of the left arch waist begins to decrease, and the variation of the stress on both sides of the tunnel tends to be symmetrical. (2) with the increase of the surface inclination, the bias effect of the tunnel increases gradually. When the local slope angle is greater than or equal to 30 擄, the bias effect of the tunnel becomes obvious and the influence of the bias voltage must be paid attention to, and with the increase of the buried depth of the tunnel, the stress and displacement distribution characteristics of the surrounding rock on the left and right sides of the tunnel tend to be consistent. When the depth of the tunnel is more than 25 m, the biasing effect of the tunnel is obviously weakened, but the tunnel is still affected by the biasing effect. (3) for the V-class surrounding rock tunnel with the surface inclination angle of 30 擄, the construction of the next door method can limit the deformation of the surrounding rock. The best effect is to reduce the range of plastic zone, the second is to leave the core soil method, and the worst is the step method. The drawback of the middle and adjoining construction method is that the construction of the middle and next door is more complicated, and the temporary supporting structure needs to be installed after the excavation, which results in the extension of the construction period.
【學(xué)位授予單位】：河北建筑工程學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U455.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 左清軍;吳立;陸中s，

本文編號(hào)：1817891