岩溶富水隧道多场耦合分析及涌水量预测研究

发布时间：2018-06-22 16:10

本文选题：隧道工程 + 岩溶　；参考：《重庆大学》2016年硕士论文

【摘要】：在山岭隧道施工过程中,受地下水影响的隧道围岩稳定性变化以及突水、突泥等问题一直困扰着工程界。在岩溶富水地区修建隧道时,由于地下水的存在,使隧道围岩稳定性变化规律及地下水涌水量的预测问题变的更为复杂,如果不能有效预测、控制地下水,则发生突水等灾害事故的可能性增大,进而影响到工程的顺利施工,甚至危及到人的生命、财产安全。因此,针对岩溶富水隧道地质灾害复杂的特点,开展隧道施工过程中应力场、渗流场、位移场之间的多场耦合问题研究,提出隧道涌水量预测方法,对岩溶隧道的安全施工是很有必要的。本文以岩溶富水隧道现场监控量测、水文观测为依托,采用理论分析、现场试验和监测、数值模拟相结合的方法,分析了地下渗流场变化对围岩应力场和位移场的作用机理,研究了应力场、位移场和渗流场多场耦合数学模型,研究了岩溶富水隧道的渗流场、应力场、位移场之间的相互作用规律,在多场耦合的基础上提出了岩溶隧道最大涌水量的计算方法,并以实际在建隧道为工程背景,进行了多种理论方法的涌水量预测,并与施工过程中实际监测涌水量对比,得出涌水量预测方法的准确性。并采用地质雷达进行现场试验,获得了渗流水影响下隧道围岩松动圈发育范围,验证了数值模拟结果的有效性。本文主要的研究成果如下:(1)在理论分析基础上,通过三泉隧道工程实例进行了水均衡法、地下径流模数法以及泉流量汇总法进行了涌水量的预测,根据隧道施工过程中涌水量实际监测结果,进行各分区涌水量预测的准确率分析,结果表明在地下水补给明确时,使用地下径流模数法预测岩溶隧道的涌水量的准确度最高,水均衡法次之。同时降雨量和涌水量之间的关系表明隧道主要水源补给靠大气降雨,证明了地下径流模数法和水均衡法在岩溶富水隧道涌水量预测的可行性与可靠性。根据工程实例分析了岩溶地区富水隧道在遇到大型垂向岩溶管道涌水时的处理方案,给类似地质条件的隧道工程的建设提供一定的借鉴和参考。(2)通过工程现场试验,选取典型断面进行了监测,结果表明:受地下水的影响会引起应力场以及岩体强度的变化。不同地下水条件下,受地下水渗流影响大的围岩压力变化值、围岩位移值以及松动圈范围均大于受地下水渗流影响小的。因此,在岩溶富水隧道工程中,地下水渗流会造成应力场变化值增加、围岩位移值增大以及松动圈范围变大的结果,采用多点位移计测量出隧道围岩松动圈的范围,验证了地质雷达测量隧道围岩松动圈的准确性。(3)利用数值模拟,以三泉隧道工程为背景,研究了多场耦合条件下隧道围岩应力场、位移场以及塑性区的分布规律,结果表明渗流场会对围岩的应力、位移以及塑性区造成明显的影响,数值分析的结果和理论解析以及现场试验研究结果基本相同,验证了数值模型的准确性。
[Abstract]:During the construction of the mountain tunnel, the stability changes of the surrounding rock of the tunnel affected by the groundwater, the water inrush and the mud gushing have been puzzling the engineering field. When the tunnel is built in the karst water rich area, the stability of the tunnel surrounding rock and the prediction of the water inflow of the underground water are more complicated, if the tunnel has been built in the karst water rich area. In order to effectively predict and control the groundwater, the possibility of the occurrence of water inrush and other disaster accidents will increase, which will affect the smooth construction of the project and even endanger the human life and property. Therefore, the multi field coupling problem between the stress field, the seepage field and the displacement field in the tunnel construction is carried out according to the complex characteristics of the geological disasters in the karst water rich tunnel. It is necessary for the safety construction of karst tunnel to be put forward in this paper, which is based on the field monitoring measurement of the karst water rich tunnel and the hydrological observation, using the method of theoretical analysis, field test, monitoring and numerical simulation. The effect of the change of underground seepage field on the stress field and displacement field of the surrounding rock is analyzed. The multi field coupling mathematical model of stress field, displacement field and seepage field is studied. The interaction law of seepage field, stress field and displacement field of karst water rich tunnel is studied. On the basis of multi field coupling, the calculation method of maximum water inrush in karst tunnel is put forward, and many theories are carried out in the engineering background of tunnel construction in practice. The method of water flow prediction, and compared with the actual monitoring of the water inflow in the construction process, the accuracy of the water inflow prediction method is obtained. The field test of geological radar is used to obtain the development range of the surrounding rock loosening circle under the influence of seepage flow, and the validity of the numerical simulation results is verified. The main research results of this paper are as follows: (1) theory On the basis of the analysis, the water balance method, the underground runoff modulus method and the spring flow summary method are used to predict the water inflow through the example of the three spring tunnel engineering. According to the actual monitoring results of the water inflow in the tunnel construction, the accuracy analysis of the water gushing volume prediction is carried out. The results show that when the groundwater recharge is clear, the land is used. The lower runoff modulus method has the highest accuracy for predicting the water inrush in karst tunnels, and the water balance method is the next. The relationship between the rainfall and the water flow indicates that the main water supply is recharged by the atmospheric rainfall, which proves the feasibility and reliability of the groundwater flow modulus method and water balance method in the prediction of the water inflow in the karst water rich tunnel. This paper analyzes the treatment scheme of the water rich tunnel in the karst area when it meets the water gushing of the large vertical karst pipeline, and provides some reference and reference for the construction of tunnel engineering with similar geological conditions. (2) through the field test of the engineering, the typical section is selected to be monitored. The results show that the influence of groundwater will cause the stress field and the strength of the rock mass. Under the conditions of different groundwater, the change values of surrounding rock pressure, the displacement value of the surrounding rock and the scope of the loosening ring are smaller than that of the groundwater seepage. Therefore, in the karst water rich tunnel engineering, the seepage of the groundwater will cause the stress field to increase, the displacement value of the surrounding rock and the scope of the loose circle become larger. As a result, a multi point displacement meter is used to measure the range of loose ring of tunnel surrounding rock, and the accuracy of measuring the loose ring of tunnel surrounding rock is verified by the geological radar. (3) using the numerical simulation, the stress field, the displacement field and the plastic zone distribution law of the tunnel surrounding rock are studied under the multi field coupling condition. The results show the seepage field. The results of the numerical analysis and the theoretical analysis and the results of the field test are basically the same, and the accuracy of the numerical model is verified.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD742

【参考文献】