覆岩离层注浆控制沉降技术及计算模型
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摘要
煤层开采以后 ,其开采周围的岩体的原始应力平衡状态因采动而受到破坏 ,应力将重新分布达到平衡。在此过程中 ,采空区上覆岩层将发生非连续破坏和连续移动 ,形成冒落带、离层带、弯曲带和松散冲积带的“四带”覆岩结构。利用岩移过程中形成的离层空间 ,通过地表钻孔向离层注浆 ,可减缓覆岩的进一步下沉。因此 ,以矿山开采沉陷理论和弹性薄板理论为基础提出了覆岩离层注浆沉降计算模型 ,可确定上覆岩层离层空间发育的层位和岩层间的最大离层间隙量 ,并可对覆岩离层注浆开采地表下沉进行量化预计。
After coal mined, the balance of original stress state is to be broken. In the course of retribution, displacement and deformation in the overburden takes place with the working face advancing. The article points out that overburden can be divided into, in ascending, caving zone, fractured zone, bending zone and loose alluvium zone. The extracting space can be prevented from transferring to ground with injection material into bed-separation gap. Applying both mining subsidence theory and elastic thin plate theory, the computational model of subsidence control technology of grouting is worked out. The model can get rid of blindness of determining the position of separated strata, forecast the surface subsidence and provide the basis of theory for forecasting surface subsidence control technology of grouting.
After coal mined, the balance of original stress state is to be broken. In the course of retribution, displacement and deformation in the overburden takes place with the working face advancing. The article points out that overburden can be divided into, in ascending, caving zone, fractured zone, bending zone and loose alluvium zone. The extracting space can be prevented from transferring to ground with injection material into bed-separation gap. Applying both mining subsidence theory and elastic thin plate theory, the computational model of subsidence control technology of grouting is worked out. The model can get rid of blindness of determining the position of separated strata, forecast the surface subsidence and provide the basis of theory for forecasting surface subsidence control technology of grouting.
引文
[1] 何国清 ,杨伦 .矿山开采沉陷学 [M] .徐州 :中国矿业大学出版社 ,1991.
[2 ] 郭惟嘉 ,毛仲玉 .覆岩沉陷离层及工程控制 [M] .北京 :地震出版社 ,1997.
[3 ] 姜岩 ,高延法 .覆岩离层注浆开采地表下沉预计 [J] .矿山压力与顶板管理 ,1997( 2 ) :3 5～ 3 6.
[2 ] 郭惟嘉 ,毛仲玉 .覆岩沉陷离层及工程控制 [M] .北京 :地震出版社 ,1997.
[3 ] 姜岩 ,高延法 .覆岩离层注浆开采地表下沉预计 [J] .矿山压力与顶板管理 ,1997( 2 ) :3 5～ 3 6.
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