摘要
为验证孔内多点源地面三维观测方法的有效性,通过孔内多点源地表电位场理论公式推导、有限差分数值计算研究了多种地电模型的地表响应。结果表明,钻孔内多点源直流电阻率三维观测思路可行,能够很好地识别地下异常体的平面位置及电阻率高低。可见在工程勘察中,可以在钻孔内布置多个点电源地表三维观测,判定钻孔附近地下岩土层结构及含水区分布情况,为钻孔周围的勘察空白区提供补充,丰富工程勘察资料。
In order to verify the effectiveness of the three-dimensional ground observation method with multi-point sources in the borehole,the surface response of various geoelectric models was studied by theoretical formula derivation and finite difference numerical calculation.Results show that the three-dimensional observation idea of multi-point source DC resistivity in borehole is feasible,and it can identify the plane position and resistivity of underground abnormal body well.In the engineering investigation,three-dimensional observation of the ground surface with multiple power sources can be arranged in the borehole to determine the distribution of underground rock and soil layer structure and water bearing area near the borehole,which provides supplement for the blank area around the borehole and enriches the engineering investigation data.
作者
赵广茂
张福彬
ZHAO Guang-mao;ZHANG Fu-bin(China Railway Design Corporation,Tianjin 300308,China;National Engineering Laboratory for Digital Construction and Evaluation Technology of Urban Rail Transit,Tianjin 300308,China)
出处
《科学技术与工程》
北大核心
2021年第2期447-452,共6页
Science Technology and Engineering
基金
中国国家铁路集团重大课题(K2018G015)
中国铁路设计集团科技开发计划(721811)。
关键词
孔内多点源
直流电阻率
三维正演
工程勘察
multi-point source in hole
direct resistivity
three-dimensional forward modeling
engineering investigation
作者简介
第一作者:赵广茂(1980-),男,汉族,山西朔州人,博士,正高级工程师。研究方向:地球物理电磁场正反演及铁路勘察应用。E-mail:zhaoguangmao@crdc.com。
