本文選題：隧道工程 + 力學(xué)機(jī)制�。� 參考：《公路交通科技》2017年05期

【摘要】：我國(guó)巖溶地區(qū)廣泛分布,隧道建設(shè)穿越巖溶區(qū)域極易發(fā)生突水突泥災(zāi)害。為防止災(zāi)害的發(fā)生,采用隔水關(guān)鍵層原理對(duì)斷層段巖盤突水力學(xué)機(jī)制進(jìn)行了理論分析研究。就巖溶隧道斷層段巖盤力學(xué)破壞機(jī)制探討建立了溶腔位于隧道側(cè)面條件下斷層突水力學(xué)模型,推導(dǎo)了巖溶隧道斷層段巖盤最小安全厚度計(jì)算公式,并結(jié)合工程實(shí)例對(duì)巖盤最小安全厚度的確定進(jìn)行了討論。對(duì)于壓性斷層,最小安全厚度計(jì)算依據(jù)以水壓0.8 MPa為分界,小于0.8 MPa時(shí)應(yīng)按抗彎強(qiáng)度分析,反之則應(yīng)按抗剪強(qiáng)度分析,同時(shí)不能忽略零水壓情況;對(duì)于張性斷層,最小安全厚度計(jì)算需考慮側(cè)方巖體上下部長(zhǎng)度,較長(zhǎng)部分更易被破壞,等長(zhǎng)時(shí)下部易被破壞。確定巖盤最小安全厚度,綜合考慮巖盤力學(xué)性質(zhì)、溶腔水壓及隧道半徑等因素,對(duì)側(cè)部巖溶隧道斷層段設(shè)計(jì)施工提供了具體參考。
[Abstract]:Because of the widespread distribution of karst areas in China, tunnel construction is prone to water inrush and mud inrush through karst areas.In order to prevent the occurrence of the disaster, the hydraulic mechanism of rock disk inrush in fault section is analyzed and studied theoretically by using the principle of key layer of water barrier.Based on the discussion of the mechanics failure mechanism of rock disk in karst tunnel fault section, the hydraulic model of fault inrush under the condition of dissolving cavity located on the side of tunnel is established, and the formula for calculating the minimum safe thickness of rock plate in karst tunnel fault section is derived.The determination of the minimum safe thickness of the rock plate is discussed with an engineering example.For compressive faults, the minimum safe thickness is calculated according to the boundary of water pressure 0. 8 MPa, when less than 0. 8 MPa, the bending strength should be analyzed, otherwise the shear strength should be analyzed, and zero water pressure should not be ignored.The length of the upper and lower part of the lateral rock mass should be taken into account in the calculation of the minimum safe thickness, the longer part is more easily destroyed, and the lower part of the same time is liable to be destroyed.The minimum safe thickness of the rock plate is determined, the mechanical properties of the rock plate, the water pressure of the dissolved cavity and the radius of the tunnel are taken into account, which provides a concrete reference for the design and construction of the lateral karst tunnel fault section.
【作者單位】： 西南石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;中國(guó)礦業(yè)大學(xué)深部巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;西南石油大學(xué)土木工程與建筑學(xué)院;中鐵西南科學(xué)研究院有限公司;
【基金】：中國(guó)礦業(yè)大學(xué)深部巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金項(xiàng)目(SKLGDUEK1308)
【分類號(hào)】：U456.33

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