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| Experimental Research on Settlement during Construction of Large-diameter Advanced Tubal Curtain |
| MA Suo-zhu |
| China Railway Tunnel Group Co., Ltd., Luoyang, Henan 471009, China |
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Abstract 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 by diauxic 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 slum by construction of tubal curtain, and the expected goal was achieved basically.
Research conclusions: The experiment proves the influence on slum 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.
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Received: 17 February 2006
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2006, Vol. 23 
