發(fā)布時(shí)間：2018-09-17 16:44

【摘要】：文章針對(duì)蘭渝鐵路兩水隧道選擇1個(gè)測(cè)孔、7個(gè)試驗(yàn)段進(jìn)行水壓致裂地應(yīng)力測(cè)量。測(cè)試結(jié)果表明兩水隧道的現(xiàn)今應(yīng)力場(chǎng)以水平應(yīng)力為主導(dǎo),應(yīng)力量級(jí)屬于極高應(yīng)力水平。最大主應(yīng)力方向?yàn)镹80°W~EW,與區(qū)域構(gòu)造應(yīng)力場(chǎng)方向一致。該測(cè)點(diǎn)的最大水平主應(yīng)力方向與隧道軸線方向夾角較小,利于隧道圍巖穩(wěn)定。結(jié)合實(shí)際的地質(zhì)條件和地層參數(shù),在實(shí)測(cè)地應(yīng)力結(jié)果的基礎(chǔ)上,建立隧道區(qū)兩個(gè)大規(guī)模三維計(jì)算模型,通過有限元分析軟件ANSYS對(duì)重力、水平擠壓和剪切等4種工況的自重應(yīng)力場(chǎng)和構(gòu)造應(yīng)力場(chǎng)分別進(jìn)行數(shù)值計(jì)算,根據(jù)多元回歸方程,宏觀擴(kuò)展分析兩水隧道區(qū)域的原巖地應(yīng)力場(chǎng)。分析結(jié)果表明,兩水隧道大部分區(qū)段的水平橫向地應(yīng)力值為7.0~9.0 MPa、水平橫向側(cè)壓力系數(shù)為1.0~1.5。宏觀地應(yīng)力場(chǎng)的分析結(jié)果對(duì)工程設(shè)計(jì)與施工具有重要參考價(jià)值。
[Abstract]:In this paper, one hole is selected for the two-water tunnel of the Lanzhou-Chongqing railway, and seven test sections are used to measure the in-situ stress caused by hydraulic fracturing. The test results show that the present stress field of two-water tunnel is dominated by horizontal stress, and the order of stress belongs to extremely high stress level. The direction of maximum principal stress is N80 擄WW, which is consistent with the direction of regional tectonic stress field. The angle between the direction of maximum horizontal principal stress and the direction of tunnel axis is small, which is beneficial to the stability of tunnel surrounding rock. Combined with the actual geological conditions and formation parameters, based on the measured results of in-situ stress, two large-scale three-dimensional calculation models were established in the tunnel area. The gravity was analyzed by the finite element analysis software ANSYS. The gravity stress field and tectonic stress field of four working conditions, horizontal extrusion and shear, were numerically calculated respectively. According to the multivariate regression equation, the geostress field of the original rock in the area of the two-water tunnel was analyzed by macroscopic expansion. The results show that the horizontal lateral stress of most sections of the two-water tunnel is 7.09.0 MPa, horizontal lateral pressure coefficient is 1.0 ~ 1.5. The results of macroscopic stress field analysis have important reference value for engineering design and construction.
【作者單位】： 蘭州交通大學(xué)土木工程學(xué)院;中鐵第一勘察設(shè)計(jì)院集團(tuán)有限公司;西北民族大學(xué)土木工程學(xué)院;長(zhǎng)江科學(xué)院;
【基金】：鐵道部科技開發(fā)計(jì)劃項(xiàng)目(2009G009B4) 國家自然科學(xué)基金項(xiàng)目(51268031) 甘肅省基礎(chǔ)研究創(chuàng)新群體計(jì)劃項(xiàng)目(145RJIA332)
【分類號(hào)】：U451.1

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