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| 1 | 提高盾构隧道进出洞端头土体加固质量的技术研究显示文摘三轴搅拌桩施工技术能够有效固结软土从而提高地基强度。以苏州市轨道交通8号线裕新路站为例,对施工设备的选择、施工工艺和方法进行研究,从而解决富水软弱地层三轴搅拌桩的质量控制问题,降低盾构施工带来的风险。利用颗粒流离散元软件模拟盾构进出洞端头土体的变形过程,并对洞口土体的应力变化以及顶部土体沉降进行分析。结果表明:随着时间的推移,端头土体最终形成圆弧剪切带,滑移半径约为0.77 m;洞口土体接触应力呈减小趋势;土体顶部出现明显的沉降槽,沉降随时间呈非线性增长,最终的沉降量达到25.20 mm。 | 郭文学 惠海鹏 陈芋如 顾金涛 姜维 黄钰程 | 2022 | 中国港湾建设2022，42，7： | 1 |
| 2 | Analytical solutions for deep tunnels in strain-softening rocks modeled by different elastic strain definitions with the unified strength theory显示文摘This paper presents the analytical solutions for the responses of tunnels excavated in rock masses exhibiting strain-softening behavior. Since previous analyses give little consideration to the effect of the intermediate principal stress on the strain-softening rock behavior, the unified strength theory was introduced to analyze the tunnel response. Four cases of different definitions of the elastic strain in the softening and residual regions, used in the existing solutions, were considered. The tunnel displacements,stresses, radii of the softening and residual zones and critical stresses were deduced. The proposed solutions were verified by comparing with numerical simulations, model tests and existing solutions. Furthermore, the solutions of the four cases were compared with each other to investigate the influence of the elastic strain expressions on the tunnel responses. The results showed that the intermediate principal stress coefficient b has a significant effect on the tunnel displacements, stress fields, and plastic radii. Parametric studies were performed to analyze the influences of the softening and residual dilatancy coefficients,softening modulus and residual strength on the tunnel responses. The parametric analysis indicated that the existing models should be carefully evaluated in the analysis of tunnels constructed through average-quality rocks;the proposed solutions outperformed the existing models in solving the mentioned problem. | SUN ZhenYu ZHANG DingLi FANG Qian DUI GuanSuo CHU ZhaoFei | 2022 | Science China(Technological Sciences)2022，65，10： | 1 |
| 3 | 隧道开挖地层位移计算方法及工程应用显示文摘经验方法是计算隧道开挖引起地层位移的重要方法,尤其是当地层的非线性塑性变形显著时,经验方法可更为合理地描述地层的位移分布规律,但是可实现地层竖向位移和水平位移统一计算的方法尚未建立。基于隧道上方土体单元的运动特征,提出了隧道开挖引起的地层位移的经验计算模型,建立了地层水平位移和竖向位移之间的关系。通过分析25组现场工程数据,优化了隧道上方地层最大沉降Sv,max(z)的公式,结合已有的沉降槽宽度系数i(z)的公式,发展了Peck-Mair公式,实现了隧道上方地层竖向位移场的合理计算。根据地层水平位移和竖向位移之间的关系,基于发展的Peck-Mair公式,推导了地层水平位移的计算公式,实现了地层竖向位移和水平位移的统一计算。在地层水平位移计算公式中,变量H(z)表示土体运动定向点位置随深度的变化规律,基于工程实测结果提出了一个对数函数实现了H(z)的定量描述。利用伦敦HEX隧道工程中实测的2组地层位移数据,验证了所提地层位移计算方法的合理性。最后,将提出的地层位移计算方法应用在北京地铁12号线安-安区间渡线段隧道开挖工程,实现了该工程中隧道开挖引起的地层位移场的反演。 | 史磊磊 何海琦 林庆涛 | 2023 | 防灾减灾工程学报2023，43，6： | 0 |
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