本文選題：隧道工程 + 初始地應(yīng)力場(chǎng)�。� 參考：《中國(guó)公路學(xué)報(bào)》2017年10期

【摘要】：為探明藍(lán)家?guī)r超大埋深特長(zhǎng)公路隧道軸線方向的初始地應(yīng)力場(chǎng)狀態(tài),依據(jù)工程地質(zhì)勘察報(bào)告,利用有限元計(jì)算軟件ANSYS建立了工程區(qū)三維地質(zhì)模型;以現(xiàn)場(chǎng)水壓致裂法測(cè)得的初始地應(yīng)力資料為研究基礎(chǔ),通過地質(zhì)力學(xué)分析確定影響初始地應(yīng)力場(chǎng)形成的主要因素,并將其表達(dá)為數(shù)值計(jì)算所需的邊界和初始條件;在各影響因素單獨(dú)作用下,計(jì)算得到水壓致裂法各測(cè)點(diǎn)位置的地應(yīng)力量值;運(yùn)用多元回歸分析獲得了藍(lán)家?guī)r隧道軸線方向上的初始地應(yīng)力場(chǎng)分布規(guī)律。根據(jù)藍(lán)家?guī)r隧道軸線處地應(yīng)力場(chǎng)回歸方程,計(jì)算得到現(xiàn)場(chǎng)應(yīng)力解除法各測(cè)點(diǎn)位置處的地應(yīng)力,并與實(shí)測(cè)結(jié)果進(jìn)行比較,從而驗(yàn)證反演回歸計(jì)算結(jié)果的合理性。結(jié)果表明:主應(yīng)力量值隨埋深呈現(xiàn)出近似線性增長(zhǎng)的關(guān)系,垂直主應(yīng)力等于或略大于單位面積上覆巖層的自重應(yīng)力;主應(yīng)力量值呈現(xiàn)出S_H(最大水平主應(yīng)力)S_h(最小水平主應(yīng)力S_V(垂直主應(yīng)力)的規(guī)律,表明藍(lán)家?guī)r隧道初始地應(yīng)力場(chǎng)以水平構(gòu)造應(yīng)力為主導(dǎo);主應(yīng)力量值大部分在20 MPa以上,說明藍(lán)家?guī)r隧道為高地應(yīng)力場(chǎng)隧道;最大水平主應(yīng)力與最小水平主應(yīng)力的量值相差較大,根據(jù)摩爾-庫(kù)侖強(qiáng)度理論可知隧道水平面內(nèi)存在較大剪應(yīng)力,易導(dǎo)致圍巖產(chǎn)生過大變形或破壞;在斷層經(jīng)過區(qū)域,受斷層擠壓剪切作用,地應(yīng)力變化劇烈,相對(duì)斷層前后的地層而言有一定的應(yīng)力松弛。
[Abstract]:In order to investigate the initial in-situ stress field in the direction of the axis of the super-large buried ultra-long highway tunnel in Lanjiayan, a three-dimensional geological model of the engineering area was established by using the finite element calculation software ANSYS, according to the engineering geological survey report. Based on the initial in-situ stress data measured by the in-situ hydraulic fracturing method, the main factors affecting the formation of the initial in-situ stress field are determined by geomechanical analysis, and expressed as the boundary and initial conditions required for numerical calculation. Under the influence of each factor alone, the in-situ stress values of the sites measured by hydraulic fracturing method are calculated, and the distribution law of initial geostress field in the axis direction of Lanjiayan tunnel is obtained by multivariate regression analysis. According to the regression equation of in-situ stress field at the axis of Lanjiayan tunnel, the in-situ stress at each measuring point of the in-situ stress relief method is calculated and compared with the measured result, which verifies the rationality of the inverse regression calculation result. The results show that the principal stress value increases linearly with the buried depth, and the vertical principal stress is equal to or slightly greater than the gravity stress of the overlying strata per unit area. The principal stress value shows the rule of Sch (minimum horizontal principal stress) Sv (vertical principal stress), which indicates that the initial geostress field of Lanjiayan tunnel is dominated by horizontal tectonic stress, and the principal stress value is above 20 MPa. It shows that Lanjiayan tunnel is a tunnel with high ground stress field, and the maximum horizontal principal stress and the minimum horizontal principal stress differ greatly. According to the Mohr Coulomb strength theory, there are large shear stresses in the horizontal plane of the tunnel. It is easy to cause excessive deformation or failure of surrounding rock, and in the area of fault passing through, the ground stress changes sharply by the action of compression and shearing of fault, and there is certain stress relaxation relative to the strata before and after the fault.
【作者單位】： 西南交通大學(xué)交通隧道工程教育部重點(diǎn)實(shí)驗(yàn)室;西南交通大學(xué)土木工程學(xué)院;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0802201,2016YFC0802202)
【分類號(hào)】：U452.11

【相似文獻(xiàn)】

相關(guān)期刊論文 前2條

1 尤哲敏;陳建平;徐穎;李濤;;大坪山隧道初始地應(yīng)力場(chǎng)有限元回歸分析[J];公路交通科技;2012年08期

2 徐彥舉;;BP神經(jīng)網(wǎng)絡(luò)在隧址區(qū)初始地應(yīng)力場(chǎng)計(jì)算中的應(yīng)用[J];公路隧道;2014年01期

相關(guān)碩士學(xué)位論文 前1條

1 束加慶;深埋隧洞工程區(qū)初始地應(yīng)力場(chǎng)研究及圍巖穩(wěn)定分析[D];河海大學(xué);2006年

，

本文編號(hào)：1824329