【作者】 徐云峰；

【导师】 张志诚；

【作者基本信息】 河海大学 ， 水工结构工程， 2006， 硕士

【摘要】 岩土工程安全监测是运用监测仪器和设备对建筑物及周围环境有关的重要参数进行系统的定期或不定期量测，对取得的监测资料进行分析、计算并作出判断的全过程。由于地下工程自身的模糊性与复杂性，一般地，直接利用安全监测的原始数据对建筑物的安全稳定状态进行评估是比较困难的，因此必须做好监测资料分析、预测、预报、反馈等各项工作，这也是开展其他研究的前提条件。地应力位移反分析是建于岩土工程安全监测的基础上的，利用安全监测得到的位移值，对该地段的初始应力场进行反演。地下洞室施工期围岩稳定性分析是基于对该部位初始应力场、岩体结构、岩体物理力学性质等都比较明了的情况下，进行的有限元计算。 本文章节安排采用层层推进的方法，主要工作如下： 1、通过对岩体形变等大量数据进行整理、分析，对电源电站地下厂房围岩体的应力、变形进行了说明和解释，尤其在地下厂房2×1250kN门机调试试验时，跟踪测量围岩体形变、受力、裂缝开合度的变化情况，及时对监测数据进行了分析、研究，反馈于现场。监测结果表明三峡电源电站地下厂房稳定性较好，岩体整体性较强； 2、基于围岩体形变的基础上，利用大量的形变监测数据，采用改进后的位移预测模型，对1号厂房监测断面处的部分岩体进行了形变的最终预测，得到了与实际情况较吻合的结果。该模型适用于一般符合前提条件的建筑物的计算； 3、假设三峡电源电站地下厂房区为均布构造应力场，采用位移反分析法弹塑性模型时，对其初始地应力进行了反演，反演结果对照左岸永久船闸现场量测的初始地应力值，以及参照长科院对升船机上闸首部位初始地应力场回归得到的结果，可以确定本文反演的初始地应力结果基本符合三峡电源电站区初始地应力的实际分布情况； 4、在地应力反演成果的基础上，结合msc.marc有限元软件，对三峡电源电站地下厂房的九层开挖进行了模拟，并就计算结果对地下厂房围岩稳定性进行了评估。从计算的结果看，计算得到的位移值与监测数据规律基本吻合，并能代表岩体形变的总体走势，可知计算得到的与实际情况相吻合。更多还原

【Abstract】 Geotechnical engineering safety monitoring is the process of carrying on systemic regular or irregular measure to the significant parameter and surroundings by using monitoring instruments and equipments and making judgment from the measured data that having been analyzed. As the mistiness and complexity of underground engineering itself, generally, it is difficult to make a evaluation for the safety of construction by applying primal data directly, so we must do some works well about data analyzing, forecast, predicting, feedback and so on, which is the premise of other research. Ground Stress Analysis-Reversed is based on Geotechnical engineering safety monitoring, which uses monitoring data to do in some area. Underground caverns steady in constructing stage is calculating at the basis of knowing the initial stress, rock mass structure, parameter of rock mass etc.The arrangement of the thesis was boosted layer upon layer, and the main study work focused on the following several aspects:1. Making explaining of stress and distortion to underground’s wall rock mass in Electrical Source Electricity Station by amount of monitoring data of Multi-extensometer and Bolt Stress Measure, especially, we measured the changes of distortion, stress and crack about wall rock mass simultaneous when we debugged 2×1250 kN door-machine, so that we could analyze and research the monitoring data in time and then feeded back to the locale. The result of monitoring data showed that underground workshop stable and rock mass intact.2. It, used reforming displacement forecast-model, has forecasted the final displacement of wall rock mass in No. 1 workshop, basing on a number of monitoring data, and the outcome is consistent to fact.3. It reversed analyzed the ground stress in underground workshop adopting elastic-plastic model at the precondition that we supposed the stress is equal. It could be concluded that the result of calculating original ground stress was objectivity, referring to the measuring of left shore permanence ship-strobe and the regress to the initial of更多还原