Water leakage susceptible areas in loess multi-arch tunnel operation under the lateral recharge conditions
Water leakage susceptible areas in loess multi-arch tunnel operation under the lateral recharge conditions
复制标题
DOI：
10.1007/s12665-020-09083-3
复制
发表时间：
2020-07
影响因子：
2.8
通讯作者：
Zhengjun Mao;Xiaokang Wang;Ning An;Xiaojun Li;Rongyu Wei;Yaqiong Wang;Hao Wu
中科院分区：
文献类型：
--
作者：
Zhengjun Mao;Xiaokang Wang;Ning An;Xiaojun Li;Rongyu Wei;Yaqiong Wang;Hao Wu
本研究对某黄土连拱隧道的渗漏水易感区域进行了检测，为黄土地区连拱隧道运行期间的渗漏水病害防治提供依据。通过对黄土连拱隧道渗漏水的现场调查，渗漏水主要集中在施工缝、伸缩缝和沉降缝三个缝处。将隧道渗漏部分的空间分布归纳抽象为三种类型：环形裂缝、纵向裂缝和全纵向裂缝+周向裂缝。通过设置不同数量的环形和纵向裂缝，共设计了20种组合。考虑地下水横向补给条件，本文设置了40、60 m加固水头和60 m无加固水头三种工况。利用midas/GTS岩土工程分析系统软件，进行了三维数值模拟，确定了不同工况下所有漏水位置组合的总水头和裂缝水压分布，分析了围岩渗流场的变化。根据裂缝总水头和水压剧烈变化的区域，确定了裂缝漏水敏感区。通过与现场调查结果的对比，验证了该方法的合理性和可靠性。
In this study, the water leakage susceptible areas in a loess multi-arch tunnel were examined, providing a basis for the prevention and control of water leakage disease during the operation periods of multi-arch tunnels in loess areas. Through the field investigation of the leakage in loess multi-arch tunnel, the leakage mainly focuses on three joints: construction joints, expansion joints, and settlement joints. The spatial distribution of the leaking part in the tunnel is summarized and abstractly into three types: annular cracks, longitudinal cracks and full longitudinal cracks + circumferential cracks. By setting up different number of annular and longitudinal cracks, a total of 20 combinations were designed. This paper sets three kinds of working conditions, including 40 and 60 m of reinforcement water head and 60 m of no reinforcement water head, considering groundwater lateral recharge conditions. Using the midas/GTS geo-technical analysis system software, 3D numerical simulations were conducted to determine the distributions of the total water head and water pressure in cracks for all the combinations of water leakage positions under different working conditions and to analyze the variations in the seepage field of the surrounding rock. Based on the areas where the total water head and water pressure in the cracks sharply changed, the water leakage susceptible areas were determined. The rationality and reliability of the method were verified by a comparison with the results of a field investigation.