论文部分内容阅读
作为防水、防腐和地基加固等多种目的和手段之一,灌浆技术可应用于河底隧道或者海底隧道。水泥作为灌浆的主要材料具有强度时间相关特性。可是目前在大部分河底隧道在设计中不考虑水泥的这种强度时间相关特性。据此,提出以弹性波测试方法获得河底隧道施工中预注浆的强度时间相关特性,并采用数值模拟方法将获得的强度时间相关特性用于评价河底隧道的施工。为了获得预注浆区域的强度时间相关特性,进行了弹性波试验。然后把试验获得的预注浆区域的强度时间相关特性用于隧道施工仿真。计算结果表明,预注浆区域的强度时间相关特性不会对河底隧道的安全产生太大的影响。在模拟河底隧道施工时,发现其强度可以使用2～7d的预注浆区域的强度。分析结果也表明,通过强度和刚度的折减可模拟其强度时间相关特性。通过试验和数值模拟相结合的方式,提出预注浆区域的强度时间相关特性对河底隧道影响的方法,可为隧道工程的施工提供参考。
As a waterproof, anti-corrosion and foundation reinforcement and many other purposes and means of grouting technology can be applied to the river tunnel or undersea tunnel. Cement as the main material of grouting has intensity time-dependent characteristics. However, at present, most of the river bottom tunnels are not designed with this strength-time-related characteristic of cement in mind. Based on this, the strength-time-related characteristics of pre-grouting in river bottom tunnel construction by elastic wave test method are proposed, and the strength-time-related characteristics obtained by numerical simulation are used to evaluate the construction of river bottom tunnel. In order to obtain the intensity-time-related characteristics of the pre-grouting zone, an elastic wave test was performed. Then the strength-time-related characteristics of the pre-grouting area obtained from the experiment are used in the tunnel construction simulation. The calculation results show that the strength-time-related characteristics of the pre-grouting area will not have much impact on the safety of the river tunnel. When simulating the river tunnel construction, it is found that the strength of the pre-grouting area can be used for 2 to 7 days. The results of the analysis also show that the intensity-time-related properties can be modeled by the reduction of strength and stiffness. Through the combination of experiment and numerical simulation, the method of influencing the time-dependent characteristics of pre-grouting area on the river bottom tunnel is proposed, which can provide a reference for the construction of the tunnel project.