中核甘肃核技术产业园预选厂址区地应力测量研究

发布时间：2018-06-23 07:41

本文选题：核技术产业园 + 水压致裂法　；参考：《地质力学学报》2017年03期

【摘要】：为更科学地指导中核甘肃核技术产业园的选址工作,需对预选厂址工程区范围内岩体的地应力状态及分布规律进行分析研究。在预选厂址工程区内对2个450m深的钻孔开展水压致裂原地应力测试,并采用了4种方法进行关闭压力处理来保证主应力值的可靠性和准确性。压裂测试结果表明,工程区内最大水平主应力值6.66~25.91 MPa,最小水平主应力值3.94~15.76 MPa,水平主应力和垂直应力关系为S_HS_hS_v,揭示工程区内水平应力作用占主导,利于逆断层活动。印模测试结果显示最大水平主应力优势方位为NE方向,与区域构造应力场方向基本吻合。基于实测数据计算K_(av)、K_(Hv)、K_(Hh)、μm和τm这5种应力状态特征参数,并利用库伦摩擦滑动准则分析预选厂址区断层活动性,进而综合评价预选厂址区的应力场特征及其对岩体工程稳定性的影响。
[Abstract]:In order to guide the site selection of nuclear technology industry park in Gansu Province more scientifically, it is necessary to analyze and study the in-situ stress state and distribution law of rock mass within the scope of pre-selected site engineering area. In order to ensure the reliability and accuracy of the principal stress values, two 450m deep boreholes in the pre-selected site engineering area were tested for the in-situ stress caused by hydraulic fracturing, and four methods were adopted to deal with the closing pressure. The results of fracturing test show that the maximum horizontal principal stress value is 6.66 ~ 25.91 MPa, the minimum horizontal principal stress value is 3.94 ~ 15.76 MPa, and the relationship between horizontal principal stress and vertical stress is SHShSv, which reveals that horizontal stress is dominant in the engineering area and is conducive to reverse fault activity. The results of impression test show that the dominant orientation of maximum horizontal principal stress is NE direction, which is basically consistent with the direction of regional tectonic stress field. Based on the measured data, the characteristic parameters of K _ (av) K _ (Hv) K _ (Hh), 渭 m and 蟿 _ m are calculated, and Coulomb friction sliding criterion is used to analyze the fault activity in the preselected site. Furthermore, the characteristics of stress field and its influence on the stability of rock mass engineering are comprehensively evaluated.
【作者单位】：中国石油大学(北京)地球科学学院;国土资源部新构造运动与地质灾害重点实验室;中国地质科学院地质力学研究所;天津市华北地质勘查局核工业247大队;
【基金】：国家科技重大专项项目(2016ZX05034003-002) 中国地质科学院地质力学研究所基本科研业务费(DZLXJK201706)
【分类号】：TU452

【相似文献】