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本文以北京地铁天安门东站至王府井区间隧道洞内轻型井点降水为研究对象,通过现场试验及数理分析,着重研究了降水对地表下沉的影响,降水对隧道结构防水的影响,以及Q—t、S—t曲线的关系等。提出了:1.开始抽水后不久,水位下降是逐渐增大的,而流量逐渐变小,最后趋于稳定。试验进行正常时,水位与流量两条曲线互相平行,表现为拐点型曲线。2.降水引起地表沉降,沉降值的大小与地层参数的选择关系很大,正确选择地层参数是沉降预测和预防的基础。3.降水对隧道结构防排水的影响较大,而全封闭式无钉铺设防水板可满足其防排水要求。
In this paper, the light well point precipitation in the tunnel tunnel from the Tiananmen East Railway Station to the Wangfujing tunnel is taken as the research object. The effects of precipitation on the surface subsidence, the effect of precipitation on the waterproofing of the tunnel structure are studied emphatically through field test and mathematical analysis. -t, S-t curve of the relationship. It is proposed that: 1. Shortly after the start of pumping, the water level decrease gradually increases while the flow rate gradually decreases, finally stabilizing. When the test is normal, the two curves of the water level and the flow rate are parallel to each other, showing an inflection point curve. 2. Precipitation causes surface subsidence. The magnitude of subsidence is related to the choice of formation parameters. Proper selection of formation parameters is the basis for subsidence prediction and prevention. 3. Precipitation on the tunnel structure of a greater impact on drainage, and fully enclosed no nail-laying waterproof board to meet its drainage requirements.