本文選題：隧道工程 + 不完全拱效應(yīng)　； 參考：《巖石力學(xué)與工程學(xué)報》2017年06期

【摘要】：隧道開挖中,掌子面 超前核心土的變形同樣會使其周圍產(chǎn)生拱效應(yīng),但該種拱效應(yīng)不同于后方已開挖區(qū)域周圍的拱效應(yīng),稱之為不完全拱效應(yīng)。不完全拱效應(yīng)的發(fā)揮與預(yù)收斂變形和擠出變形有很大的關(guān)系,基于不完全拱效應(yīng)提出了超前核心土周圍圍巖壓力的計算公式,此公式與太沙基公式的不同在于考慮了預(yù)收斂變形對圍巖壓力的影響,并在黏性土的推導(dǎo)中考慮了非垂直滑移面效應(yīng),假定破裂面與垂直方向存在夾角θ。算例分析顯示,隨著預(yù)收斂變形的增加拱頂土壓力的變化可分為近線性快速下降、緩慢下降及穩(wěn)定階段,計算土壓力隨內(nèi)摩擦角、埋深比及黏聚力的增大而減小,且在黏性土中隨破裂面傾角的增大而增大。在此基礎(chǔ)上,推導(dǎo)了計算基于新意法的超前核心土加固參數(shù)的理論計算公式,結(jié)合算例驗證了理論公式的適用性,該公式計算簡單,便于理解,可用于新意法的初步設(shè)計階段。
[Abstract]:In tunnel excavation, the deformation of the core soil in front of the palm surface will also cause the arch effect around it, but the arch effect is different from the arch effect around the excavated area in the rear area, which is called incomplete arch effect. The exertion of incomplete arch effect is closely related to preconvergent deformation and extrusion deformation. Based on the incomplete arch effect, a formula for calculating the surrounding rock pressure around the leading core soil is proposed. The difference between this formula and the Terzaghi formula is that the influence of preconvergent deformation on the surrounding rock pressure is considered, and the non-vertical slip plane effect is considered in the derivation of the clay, and the angle 胃 between the fracture surface and the vertical direction is assumed. With the increase of preconvergent deformation, the variation of earth pressure of arch roof can be divided into three stages: near linear rapid decline, slow decline and steady stage. The calculated earth pressure decreases with the increase of internal friction angle, burying depth ratio and cohesive force. Moreover, the inclination of the fracture surface increases with the increase of the inclination of the fracture surface in the clay. On this basis, the theoretical calculation formula for calculating the parameters of leading core soil reinforcement based on the new idea method is derived. The applicability of the theoretical formula is verified by an example. The formula is simple and easy to understand, and can be used in the preliminary design stage of the new meaning method.
【作者單位】： 長安大學(xué)公路學(xué)院;北京城建設(shè)計發(fā)展集團(tuán)股份有限公司;
【基金】：國家自然科學(xué)基金面上項目(51478044,51678062)~~
【分類號】：U455.4

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本文編號：1852492