本文選題：TBM + 花崗巖�。� 參考：《高校地質(zhì)學(xué)報(bào)》2017年01期

【摘要】：開挖損傷區(qū)不僅對(duì)一般工程的穩(wěn)定性具有重要影響,同時(shí)其滲透特性變化也是一些特殊工程(如高放廢物地質(zhì)處置工程)關(guān)心的重點(diǎn)。該文結(jié)合桓集隧道四標(biāo)段工程,通過在隧道洞壁取樣而后進(jìn)行室內(nèi)超聲波波速和滲透試驗(yàn)測試的方法,研究了TBM開挖隧道圍巖的損傷區(qū)范圍和滲透特性變化,同時(shí)也對(duì)樣品洞壁端面的粗糙程度進(jìn)行了量測,結(jié)果表明:(1)該隧道圍巖強(qiáng)度較高,且工程區(qū)地應(yīng)力屬于低—中等水平,圍巖損傷主要由TBM開挖造成。(2)隧道圍巖的原巖波速在4713~5376 m/s之間,損傷區(qū)波速在2943~4856 m/s之間,圍巖質(zhì)量較好處的原巖波速和損傷區(qū)波速均大于圍巖質(zhì)量較差處的對(duì)應(yīng)值,而圍巖質(zhì)量較差處的最大波速降比比圍巖質(zhì)量較好處的數(shù)值略大;各樣品的損傷區(qū)范圍在11.0~52.0 mm之間,一般圍巖質(zhì)量越好,損傷范圍越小。(3)圍巖質(zhì)量較好處的原巖和損傷樣品滲透率均小于圍巖質(zhì)量較差處的對(duì)應(yīng)樣品值;同一巖芯的損傷樣品滲透率大于原巖樣品,本次研究的機(jī)械開挖損傷使圍巖的滲透率提高1.94~3.75倍。(4)研究的隧道表面波谷和峰高范圍在-5~4 mm之間,滿足SKB對(duì)處置孔壁粗糙程度的要求。
[Abstract]:Excavation damage zone not only has an important influence on the stability of general engineering, but also the change of permeability characteristics is the focus of some special projects (such as geological disposal of high-level radioactive waste). In this paper, the damage zone and permeability characteristics of the surrounding rock of the tunnel excavated by TBM are studied by taking samples from the tunnel wall and testing the velocity and permeability of the ultrasonic wave in the laboratory, combined with the fourth section of Huanji tunnel. At the same time, the roughness of the end face of the sample wall is measured. The results show that the surrounding rock strength of the tunnel is high and the in-situ stress in the engineering area is of low to medium level. The damage of surrounding rock is mainly caused by TBM excavation.) the original wave velocity of tunnel surrounding rock is between 4713 ~ 5376 m / s, and the wave velocity of damage zone is between 2943 ~ 4 856 m / s. The wave velocity of the original rock and the damaged area are both higher than the corresponding value of the poor mass of surrounding rock. The maximum velocity drop ratio of surrounding rock mass is slightly larger than that of surrounding rock mass, and the damage zone of each sample is between 11.0 mm and 52.0 mm, the better the mass of surrounding rock is. The smaller the damage range is, the smaller the permeability of the original rock and the damaged sample is smaller than the value of the corresponding sample where the surrounding rock mass is poor, and the permeability of the damage sample of the same core is larger than that of the original rock sample. The damage caused by mechanical excavation in this study increases the permeability of surrounding rock by 1.94 ~ 3.75 times. (4) the range of surface wave trough and peak height of the tunnel studied is -5mm, which meets the requirement of SKB for the rough degree of the disposal hole wall.
【作者單位】： 南京大學(xué)-華東有色地勘局地下空間與地質(zhì)環(huán)境研究所;北京工業(yè)大學(xué)城市防災(zāi)與減災(zāi)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金課題(41172241;41372266) 國防科技重點(diǎn)項(xiàng)目(科工二司[2012]492號(hào))聯(lián)合資助
【分類號(hào)】：U451.2

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