检索结果-南通市图书馆

New development of hydraulic fracturing technique for in-situ stress measurement at great depth of mines

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第6期15卷 665-670页

作者： Meifeng Cai Hua Peng Hongguang Ji School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China Research Institute of Geomechanics Beijing 100080 China

In-situ stress measurement using the hydraulic fracturing technique was made at Wanfu Coal Mine in Shandong Province, China. To solve problems caused by great measuring depth and extra thick overburden soil layers in the mine, a series of improved techniques were developed for the traditional hydraulic fracturing technique and equipment to increase their pressure-enduring ability and to ensure safe and flexible removal of the sealing packers with other experimental apparatus. Successful in-situ stress measurement at 37 points within 7 boreholes, which were mostly over 1000 m deep, was completed. Through the measurement, detailed information of in-situ stress state has been provided for mining design of the mine. The improved hydraulic fracturing technique and equipment also provide reliable tools for in-situ stress measurement at great depth of other mines.

关键词： hydraulic fracturing in-situ stress measurement coal mine measuring depth

Measurement and study of the distributing law of in-situ stresses in rock mass at great depth

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2006年第3期13卷 207-212页

作者： Zhuoying Tan Meifeng Cai State Key Laboratory for High-Efficient Mining and Safety of Metal Mines Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China

To solve the technical cruxes of the conventional system in deep rock mass, an automatic testing system for hydraulic fracturing that includes a single tube for hydraulic loop, a pressure-relief valve, central-tubeless packers, and a multichannel real-time data acquisition system was used for in-situ stresses measurement at great depths （over 1000 m） in a coalfield in Juye of Northern China. The values and orientations of horizontal principal stresses were determined by the new system. The virgin stress field and its distributing law were decided by the linear regression from the logged 37 points in seven boreholes. Besides, the typical boreholes arranged in both the adjacent zone and far away zone of the faults were analyzed, respectively. The results show that a stress concentration phenomenon and a deflection in the orientation of the maximal horizontal stress exist in the adjacent zone of the faults, which further provides theoretical basis for design and optimization of mining.

关键词： rock mass at great depth earth stress hydraulic fracturing in-situ stress distribution

Multi-factor sensitivity analysis of shallow unsaturated clay slope stability

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2005年第3期12卷 193-202页

作者： ZhuoyingTan MeifengCai CivilandEnvironmentalEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China

An unsaturated clay slope, with various sloping angles and a thickness of 14 m, consists of backfill, slope soil and residual soil. Slide interfaces were determined by geophysical approaches and the original slope was reconstructed. Sub-slope masses were classified based on the varieties of sloping angle. A force recursive principle was proposed to calculate the stability coefficient of the sub-slope masses. The influencing factors such as sloping angle, water content, hydrostatic pressure, seismic force as well as train load were analyzed. The range and correlation of the above-mentioned factors were discussed and coupled wave equations were established to reflect the relationships between unit weight, cohesion, internal frictional angle, and water content, as well as between internal frictional angle and cohesion. The sensitivity analysis of slope stability was carried out and susceptive factors were determined when the factors were taken as independent and dependent variables respectively. The results show that sloping angle, water content and earthquake are the principal susceptive factors influencing slope stability. The impact of hydrostatic pressure on slope stability is similar to the seismic force in quantity. Train load plays a small role in slope stability and its influencing only reaches the roadbed and its neighboring slope segment. If the factors are taken as independent variables, the influencing extent of water content and cohesion on slope stability can be weakened and train load can be magnified.

关键词： unsaturated clay slope stability multi-factor sensitivity analysis

Seepage effects of groundwater and its make-up water on triggering ground subsidence

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2006年第1期13卷 11-15页

作者： Zhenhua Ouyang Meifeng Cai Changhong Li Mowen Xie Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China

The functioning mechanism of groundwater and its make-up water in the process of ground subsidence was studied from such three aspects as osmotic corrasion, osmotic pressure effect and concretion effect, As to osmotic corrasion, its forming conditions, mechanical mechanism and process were analyzed, As to osmotic pressure effect, it was mainly studied from hydrostatic pressurizing effect, sop softening effect and negative pressure sealing effect. Through concretion and saturation of soil, the factors of concretion settlement were analyzed. The results showed that both groundwater and its make-up water are important triggering factors to ground subsidence.

关键词： groundwater make-up water ground subsidence seepage effect

在线全文

学校读者我要写书评

暂无评论

万福煤矿深部水压致裂地应力测量

岩石力学与工程学报 2006年第5期25卷 1069-1074页

作者：蔡美峰陈长臻彭华纪洪广乔兰谭卓英北京科技大学土木与环境工程学院北京100083 中国地质科学院地质力学研究所北京100080

为了克服煤田上覆冲击层厚度高达700m所造成的困难,保证超千米深部地应力测量的成功,对传统水压致裂法测量方法和设备进行改进,增加测量系统的耐压能力和测试系统的精度。在完成的7个钻孔、37个测点的现场实测中,6个钻孔的深度接近和超... 详细信息

为了克服煤田上覆冲击层厚度高达700m所造成的困难,保证超千米深部地应力测量的成功,对传统水压致裂法测量方法和设备进行改进,增加测量系统的耐压能力和测试系统的精度。在完成的7个钻孔、37个测点的现场实测中,6个钻孔的深度接近和超过1100m,最大测点深度为1105m,创造了我国水压致裂法测量地应力钻孔深度的新记录。通过实测,确定了矿区的地应力状态及其分布规律。研究结果表明,37个测点的最大水平主应力与垂直主应力的比值为1.441～3.224,平均为1.97,反映了矿区地应力场以水平应力为主导的特点。测量结果可为矿山建设和开采设计提供科学的依据。

关键词：岩石力学水压致裂法改进技术地应力测量超千米深部

在线全文

学校读者我要写书评

暂无评论

节理岩体物理模拟与超声波试验研究

岩石力学与工程学报 2007年第5期26卷 1026-1033页

作者：韩嵩蔡美峰北京科技大学土木与环境工程学院北京100083

以三维各向异性介质弹性波方程为理论基础,给出具有不同节理面岩体的数学物理模型,将具有典型节理构造的岩体分别简化为横向各向同性和单斜各向异性介质,并得出各向异性介质中的弹性波在遇节理面发生反射、透射后沿不同传播方向的传播... 详细信息

以三维各向异性介质弹性波方程为理论基础,给出具有不同节理面岩体的数学物理模型,将具有典型节理构造的岩体分别简化为横向各向同性和单斜各向异性介质,并得出各向异性介质中的弹性波在遇节理面发生反射、透射后沿不同传播方向的传播速度。根据上述数学物理模型制备节理岩体物理模型,相对于节理面以不同的入射角度进行超声波波速测试,试验证明,超声波波速对于物理模型中节理面的影响十分敏感,节理面的存在使弹性波传播速度重新分布,在合理布置测点的情况下,对节理面的存在及方向识别较为准确。在实际工程中,通过合理布置测点的超声波测试,可以对工程岩体中节理裂隙发育的优势方向进行判断,有效地反映岩体结构面的各向异性,为实际工程提供数据资料。

关键词：岩石力学节理岩体各向异性物理模型超声波

在线全文

学校读者我要写书评

暂无评论

深孔水压致裂地应力测量及应力场反演分析

岩石力学与工程学报 2010年第4期29卷 778-786页

作者：张延新宋常胜蔡美峰彭华燕山大学建筑工程与力学学院河北秦皇岛066004 河南理工大学能源科学与工程学院河南焦作454000 北京科技大学土木与环境工程学院北京100083 中国地质科学院地质力学研究所北京100081

万福煤矿是一座拟建特大型矿井,上覆冲积层厚度高达700m,主煤层平均埋深达1004.12m。选择7个勘探钻孔、37个试验段进行深孔水压致裂地应力测量。为保证超千米深孔地应力测量的成功,对传统水压致裂法的测试技术和设备进行改进,提高系统... 详细信息

万福煤矿是一座拟建特大型矿井,上覆冲积层厚度高达700m,主煤层平均埋深达1004.12m。选择7个勘探钻孔、37个试验段进行深孔水压致裂地应力测量。为保证超千米深孔地应力测量的成功,对传统水压致裂法的测试技术和设备进行改进,提高系统的耐压能力和测试精度。测孔最大水平主应力与垂直主应力的比值较大,平均为1.97,说明勘探区现今应力场以水平应力为主导。测得的21个印模中有18个点位于NEE-SWW向,3个点位于NW-SE向,符合本区震源机制解得出的挤压应力场方向,且与新构造活动所反映的区域构造应力场方向一致。结合实际的地质条件和地层参数,在实测地应力结果的基础上,提出基于有限元三维地应力拟合分析法反演勘探区现今地应力场,给出煤层顶板主应力分布曲线并分析井下可能出现的各类不良地质现象。

关键词：岩石力学水压致裂法地应力测量有限元地应力拟合法

在线全文

学校读者我要写书评

暂无评论

深部地应力场下砂岩力学性质的变化

煤炭学报 2007年第6期32卷 570-572页

作者：韩嵩蔡美峰北京科技大学土木与环境工程学院北京100083

山东万福煤矿位于鲁西南成武县和巨野县交界处,煤田上覆土层厚度高达700 m.在该矿区采用水压致裂法对深部地应力进行了测量,获得了矿区较为准确的地应力状态和分布规律.在此基础上,结合万福矿区地下900 m以下砂岩所处的地压环境,采用三... 详细信息

山东万福煤矿位于鲁西南成武县和巨野县交界处,煤田上覆土层厚度高达700 m.在该矿区采用水压致裂法对深部地应力进行了测量,获得了矿区较为准确的地应力状态和分布规律.在此基础上,结合万福矿区地下900 m以下砂岩所处的地压环境,采用三轴岩石力学测试系统研究深部地应力条件对不同砂岩力学性质的影响,建立砂岩力学性质与深部地应力之间的相关关系.结果表明,砂岩的刚度和强度随围压的增大而增大;同时,在高围压情况下,砂岩由低围压条件下的剪切破裂转变为塑性流动破坏.

关键词：地应力场水压致裂法地应力测量地质构造

万福煤矿地应力场分布规律及其与地质构造的关系

在线全文

学校读者我要写书评

暂无评论

煤炭学报 2008年第11期33卷 1248-1252页

作者：蔡美峰彭华乔兰马秀敏北京科技大学土木与环境工程学院北京100083 中国地质科学院地质力学研究所北京100080

为了保证山东万福煤矿矿井建设和开采的安全,在前期勘探阶段即采用水压致裂法进行了矿区地应力场测量.分析了矿区的区域地质构造与现今构造运动特征、地震活动性及区域构造应力场,以及根据实测结果获得的矿区地应力场分布规律,确立了矿... 详细信息

为了保证山东万福煤矿矿井建设和开采的安全,在前期勘探阶段即采用水压致裂法进行了矿区地应力场测量.分析了矿区的区域地质构造与现今构造运动特征、地震活动性及区域构造应力场,以及根据实测结果获得的矿区地应力场分布规律,确立了矿区实测地应力场与区域地质构造的一致性关系.

关键词：地应力场分布规律地质构造