多道瞬态面波法与微动法联合推断岩溶塌陷区覆盖层的结构和厚度分布
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摘要
为了大尺度范围内获取岩溶塌陷典型调查区覆盖层的结构和厚度分布,采用多道瞬态面波法与微动法,对柳州市柳城县东泉公社幅岩溶塌陷重点调查区进行了野外观测,根据微动法提取的特征频率与地层厚度的关系,结合已知钻孔资料,得出覆盖层厚度与特征频率的函数关系,获取了覆盖层的厚度分布,根据面波的频散特性,得出覆盖层的横波速度分布,获取了覆盖层的结构分布,结合得出的覆盖层结构和厚度分布,推断出测区内发育4条断层或溶沟等局部构造。研究表明,利用微动法提取的特征频率和面波的频散特性,可以有效地推断出塌陷区覆盖层的结构和厚度分布。
In order to obtain the structure and thickness distribution of the overburden layer in the typical karst collapse area in large scale,multi-channel transient surface wave method and microtremor method were used to carry out field survey in the typical karst collapse area of Dongquan commune in Liucheng country,Liuzhou city.Based on the relationship between the characteristic frequency and the thickness of the formation extracted by the microtremor method,combined with the existing borehole data,the functional relationship between the thickness of the covering layer and the characteristic frequency is obtained and the thickness distribution of the overburden layer can be derived.The shear wave velocity distribution of the overburden layer was obtained from the dispersion characteristics of the surface wave,based on which the structural distribution of the overburden layer can be derived.With the structure and thickness distribution of cover layer,four local faults or dissolution trenches in the survey area were inferred.The study shows that the structure and thickness distribution of the overburden layer can be effectively deduced by using the characteristic frequency of microtremor and the dispersion characteristics of the surface wave.
In order to obtain the structure and thickness distribution of the overburden layer in the typical karst collapse area in large scale,multi-channel transient surface wave method and microtremor method were used to carry out field survey in the typical karst collapse area of Dongquan commune in Liucheng country,Liuzhou city.Based on the relationship between the characteristic frequency and the thickness of the formation extracted by the microtremor method,combined with the existing borehole data,the functional relationship between the thickness of the covering layer and the characteristic frequency is obtained and the thickness distribution of the overburden layer can be derived.The shear wave velocity distribution of the overburden layer was obtained from the dispersion characteristics of the surface wave,based on which the structural distribution of the overburden layer can be derived.With the structure and thickness distribution of cover layer,four local faults or dissolution trenches in the survey area were inferred.The study shows that the structure and thickness distribution of the overburden layer can be effectively deduced by using the characteristic frequency of microtremor and the dispersion characteristics of the surface wave.
引文
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[12]Okada H.The Microtremor Survey Method[M].Society of Exploration Geophysicists,2003.
[2]刘伟,甘伏平,赵伟,等.高密度电法与微动技术组合在岩溶塌陷分区中的应用分析:以广西来宾吉利塌陷为例[J].中国岩溶,2014,33(1):118-122.
[3]武毅,孙银行,李凤哲.西南岩溶地区不同含水介质地球物理勘察技术[J].中国岩溶,2011,30(3):278-284.
[4]孙银行,连截,武毅.岩溶含水介质充填水和泥识别的地球物理勘查技术探讨[J].中国岩溶,2012,31(4):459-464.
[5]张伟,甘伏平,刘伟,等.双相介质瑞雷面波有限差分正演模拟[J].物探与化探,2014,38(6):1275-1283.
[6]武斌,张淳,刘敏.瑞雷波法在灰岩工程中的应用[J].工程地球物理学报,2007,4(1):27-30.
[7]吴志坚,曾立峰,王兰民,等.地脉动法在黄土地区S波速度构造探测中的应用[J].上海交通大学学报,2011,45(5):696-705.
[8]杨奎,梁北援,刘澜,等.微动面波的介质响应和H/V谱特征研究[J].地球物理学进展,2012,27(4):1782-1787.
[9]张文辉,金维浚,张衡.用H/V谱比法与折射微动法确定表土层参数[J].地震,2013,33(4):172-181.
[10]张泽忠,吴志坚,王平,等.地脉动方法在合作市覆盖层厚度探测中的应用[J].地震研究,2013,36(3):337-341.
[11]Nakamura Y.A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface[J].Quarterly Reports of the Rail-way Technical Research Institute Tokyo,1989,30:25-33.
[12]Okada H.The Microtremor Survey Method[M].Society of Exploration Geophysicists,2003.