【摘要】：隨著人類地下空間開發(fā)活動(dòng)逐漸走向地球深部,高地應(yīng)力已成為地下巖體工程典型的地質(zhì)特征之一,并嚴(yán)重影響深埋洞室圍巖的安全穩(wěn)定。本文首先分析了我國(guó)地應(yīng)力場(chǎng)分布規(guī)律,然后分別采用理論計(jì)算和數(shù)值模擬方法,研究了地應(yīng)力準(zhǔn)靜態(tài)卸荷及瞬態(tài)卸荷條件下圍巖損傷的產(chǎn)生機(jī)理與演化規(guī)律,最后結(jié)合加拿大URL地下實(shí)驗(yàn)室及錦屏二級(jí)水電站深埋引水隧洞圍巖損傷檢測(cè)結(jié)果,進(jìn)一步探討了高地應(yīng)力條件下不同卸荷方式對(duì)圍巖損傷區(qū)形成及特征的影響。研究結(jié)果表明:與地應(yīng)力準(zhǔn)靜態(tài)卸荷相比,瞬態(tài)卸荷會(huì)在圍巖中產(chǎn)生一個(gè)附加動(dòng)應(yīng)力,從而放大圍巖徑向卸載和環(huán)向加載效應(yīng),使得圍巖更容易受損;隨著側(cè)壓力系數(shù)的增大,瞬態(tài)卸荷和準(zhǔn)靜態(tài)卸荷誘發(fā)的圍巖損傷范圍均增大,并且在最小主應(yīng)力方向上圍巖損傷主要表現(xiàn)為剪切破壞,而在最大主應(yīng)力方向上主要表現(xiàn)為拉破壞。
[Abstract]:With the development of human underground space gradually towards the deep earth, high ground stress has become one of the typical geological characteristics of underground rock mass engineering, and has seriously affected the safety and stability of the surrounding rock. In this paper, the distribution law of in-situ stress field in China is analyzed at first, and then the mechanism and evolution of surrounding rock damage under quasi-static unloading and transient unloading are studied by theoretical calculation and numerical simulation, respectively. In the end, combined with the damage detection results of the underground laboratory of URL in Canada and the deep diversion tunnel of Jinping II Hydropower Station, the influence of different unloading modes on the formation and characteristics of surrounding rock damage area under the condition of high in-situ stress is further discussed. The results show that the transient unloading will produce an additional dynamic stress in the surrounding rock compared with the quasi-static unloading of the in-situ stress, thus amplifying the radial unloading and circumferential loading effects of the surrounding rock and making the surrounding rock more easily damaged. With the increase of lateral pressure coefficient, the damage range of surrounding rock induced by transient unloading and quasi-static unloading increases, and the damage of surrounding rock in the direction of minimum principal stress is mainly manifested as shear failure. In the direction of maximum principal stress, tensile failure is the main manifestation.
【作者單位】： 三峽大學(xué)水利與環(huán)境學(xué)院;武漢大學(xué)水資源與水電工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51609127) 湖北省自然科學(xué)基金項(xiàng)目(2016CFB238) 國(guó)家重點(diǎn)基礎(chǔ)發(fā)展計(jì)劃(973)項(xiàng)目(2011CB076354)資助
【分類號(hào)】：TV221.2

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本文編號(hào)：2313144