| 引用本文: | 王登科,骆建军,王官清,李飞龙,侯艳娟.隧底富水围岩脱空条件下重载铁路隧道动力响应[J].哈尔滨工业大学学报,2023,55(7):33.DOI:10.11918/202209090 |
| WANG Dengke,LUO Jianjun,WANG Guanqing,LI Feilong,HOU Yanjuan.Dynamic response of heavy-duty railway tunnel under the condition of water-rich surrounding rock void of the tunnel bottom[J].Journal of Harbin Institute of Technology,2023,55(7):33.DOI:10.11918/202209090 |
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| 摘要: |
| 为研究隧底围岩脱空对水-力耦合作用下重载铁路隧道动力响应特性的影响,采用现场试验与数值模拟相结合的方法,分别以竖向位移、孔隙水压力和竖向动应力作为评价指标,分析了不同脱空形状（椭圆、余弦和矩形）下富水隧底结构的动力响应规律,提出了一种符合实际的脱空形状,确定了富水隧底围岩的脱空阙值。研究结果表明:随着脱空宽度的增加,隧道底部结构动力响应不断增大,且脱空宽度超过一定值后动力响应变化加剧,这种现象在脱空区域尤为明显；3种脱空形状下,以矩形脱空动力响应最大,椭圆形脱空次之,余弦形脱空最小；其中,椭圆形脱空最符合实际,该脱空下基底动力响应是无脱空情况下的4.2倍,隧道底部围岩脱空阙值为0.6 m。研究结果可为富水重载铁路隧道行车安全及脱空病害整治提供依据。 |
| 关键词: 重载铁路隧道 富水软弱地层 水-力耦合 隧底围岩脱空 动力响应 |
| DOI：10.11918/202209090 |
| 分类号:U25 |
| 文献标识码:A |
| 基金项目:中央高校基本科研业务费(2022JBZY041)；国家自然科学基金(52278387) |
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| Dynamic response of heavy-duty railway tunnel under the condition of water-rich surrounding rock void of the tunnel bottom |
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WANG Dengke,LUO Jianjun,WANG Guanqing,LI Feilong,HOU Yanjuan
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(Key Laboratory of Urban Underground Engineering of Ministry of Education（Beijing Jiaotong University）, Beijing 100044, China)
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| Abstract: |
| In order to study the effects of surrounding rock void of the tunnel bottom on dynamic response characteristics of the heavy-duty railway tunnel under the hydro-mechanical coupling effect. The method of combining field test and numerical simulation was adopted. Taking the vertical displacement, pore water pressure, and vertical dynamic stress as evaluation indicators, the dynamic response law of water-rich tunnel bottom structure under different cavity shapes (ellipse, cosine and rectangle) was analyzed. A practical void shape has been proposed, and the threshold value of the tunnel bottom surrounding rock void in the water-rich tunnel was determined. The results show that with the increase of the void width, the dynamic response of the tunnel bottom structure increases continuously, and the dynamic response changes intensify when the void width exceeds a certain value, this phenomenon is especially obvious in the void area. Among the three void shapes, the rectangular void has the largest dynamic response, followed by the elliptical void, and the cosine void is the smallest. Among them, the elliptical void is the most realistic. The dynamic response of the base under this void is 4.2 times that of the case without void, and the threshold value of surrounding rock void of the tunnel bottom is 0.6 m. The research results can provide a basis for the safety of water-rich heavy-duty railway tunnels and the treatment of voiding diseases. |
| Key words: heavy-duty railway tunnel water-rich soft stratum hydro-mechanical coupling tunnel bottom surrounding rock void dynamic response |
