摘要
研究目的:北京地铁5号线崇文门站从既有运营地铁下穿过,运营地铁对沉降有严格要求,为安全顺利修建崇文门站,特进行大直径超前管幕施工沉降试验研究。研究方法:为研究施工引起的沉降变化情况,采取了实验的方法;具体实验时,管幕采用与施工方案完全一样的实物,选取了地质情况相似的地层,管幕顶进采用水平液压干取土螺旋钻机,长支架水平导向,管幕采用的是直径600mm管棚组合,工字钢咬合,实验前已进行了理论计算,以便实验后进行实际对比。研究结果:施工方案中提出了大直径超前管幕支护措施,用以控制地层变位。实验过程顺利,测试到了管幕施作对土层的影响,基本达到了预期目的。研究结论:实验验证了大直径管幕施工对周围土体影响较小,实际测试数据与理论计算结果较接近,大直径管幕超前支护措施可以在实际工程中应用。
Research purposes： Chongwenmen Station of Line 5 of Beijing Metro will underneath pass the existing operating Metro, but there is strict requirement for settlement to operate Metro. The experimental research was made on settlement during construction of large -diameter advanced tubal curtain so as to build Chongwenmen Station safely and smoothly. Research methods：The experiment was done in order to make research on settlement changes caused by construction. In experiment, the same matter as that in construction scheme for tubal curtain and the similar stratum of geological condition were used. The tubal curtain was jacked in by level hydraulic dry screw drilling machine with level guidance by long support. The unit of tube shed with diameter of 600 mm was adopted for tubal curtain with I steel occlusion. The theoretical calculation was made before the experiment for making comparison with that after experiment. Research results：The support measures in advance were proposed in construction scheme for large - diameter advanced tubal curtain in order to control the displacement of stratum. The experiment was done smoothly and found out the influence on solum by construction of tubal curtain, and the expected goal was achieved basically. Research conclusions：The experiment proves the influence on solum by construction of large - diameter tubal curtain is small, the real tested data are close to the result of theoretical calculation and the support measures in advance for large -diameter tubal curtain can be used in real construction.
出处
《铁道工程学报》
EI
北大核心
2006年第6期64-66,91,共4页
Journal of Railway Engineering Society
关键词
大直径
超前管幕
土层沉降
施工实验
验证对比
large diameter
advanced tubal curtain
solum settlement
construction experiment
proving and comparisom
