中核甘肃核技术产业园预选厂址区地应力测量研究  

A STUDY ON IN-SITU STRESS MEASUREMENT IN A CANDIDATE SITE FOR CNNC NUCLEAR TECHNOLOGY INDUSTRIAL PARK IN GANSU PROVINCE

作　　者：陈利忠[1,2,3] 洪波 张全锋 曾联波[1] 邱君[2,3] 李冉[2,3] 代进雄[1] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]国土资源部新构造运动与地质灾害重点实验室,北京100081 [3]中国地质科学院地质力学研究所,北京100081 [4]天津市华北地质勘查局核工业247大队,天津301800

出　　处：《地质力学学报》2017年第3期475-486,共12页Journal of Geomechanics

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)

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_H>S_h>S_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。In order to more scientifically guide the site selection of CNNC nuclear technology industrial park, it is necessary to analyze the in situ stress state and the distribution law of the rock mass within the scope of the project area of the preselected site. Therefore, in-situ stress measurement was carried out by hydraulic fracturing in two 450 mdrilling in the project area, and 4 methods were used in the data processing stage to determine the instantaneous shut-in pressure to make sure the principal stress value reliable and accurate. The hydro-fracturing test results indicate that the maximum horizontal principal stress value is 6. 66 ？25. 91 M P a and the m i n i m u m is 3. 94 ？15. 76 MPa. The stress regime is 5H 〉 5h 〉 S v, showing that the stress filed is dominated by the tectonic horizontal stress, and this kind of stress state is beneficial to reverse fault activities. The fracture impression test results show that the orientation of the principal horizontal stress in the project area is dominantly in the NE direction, which is in general agreement with that of regional tectonic stress field. Based on the measured data, the stress state parameters K av, K Uv, K uh, [jLm and r m were calculated, and the fault activity of the preselected site was analyzed using Coulomb friction sliding criterion, so as to synthetically evaluate the impact of the stress field characteristicsof the preselected site on the stability of rock mass engineering.

关 键 词：核技术产业园 水压致裂法 地应力测量 应力状态 工程稳定性 

分 类 号：P315.727[天文地球—地震学]