鹤大公路采空区综合勘察及稳定性评价  

Comprehensive Survey and Stability Estimation of Heda Highway Gob

作　　者：张旭东[1] 车殿国[1] 毕万本[1] 

机构地区：[1]黑龙江省公路勘察设计院,哈尔滨150080

出　　处：《森林工程》2010年第6期69-71,共3页Forest Engineering

摘　　要：利用调查、地质调绘、工程物探及钻探等勘探方法,对鹤大公路K225+179中桥下部采空区进行综合勘察,查明场地地质构造、地层岩性、采空区分布范围、规模及塌陷情况,采空煤层为15#煤层,上部覆岩为软弱覆岩,塌陷导致地表出现沉降,并引发桥体下沉。进行采空区区域划分及稳定性分析评价,并预测后期位移量,采空区为倾斜煤层采空区,煤层厚度较大,预测后期桥体会发生较大沉陷,并产生较大水平位移。为保证桥梁的安全,根据治理难度分析,提出桥梁移位至无采空区的安全地段,原桥梁拆除后修筑路基的整治方案。By adopting the exploration methods such as survey,geological mapping,engineering geophysics and drilling,the comprehensive survey of K225＋179 bridge underpart gob of Heda highway was carried out.The distribution,scale and collapse condition of the gob together with the site geological structure and formation lithology were all identified.The mined coal seam of the gob was 15#,with soft rock in upper layer.The collapse led to the bridge sinking and the settlement of the surface ground.The regional division of gob was made,and its stability was analyzed and evaluated.As the gob seam was inclined and very thick,it was forecasted that a large subsidence of the bridge would occur,with a great level of displacement in later period.To ensure the safety of the bridge and to analyze the extent of treating difficulty,a treatment program was put forward to build the embankment at a safe section without gob after demolishing the former bridge.

关 键 词：综合勘察 采空区 地面沉陷 

分 类 号：U443.154[建筑科学—桥梁与隧道工程]