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| STUDY OF STRESS AND DEFORMATION CHARACTERISTICS OF ZHANGMAO NEARLY SATURATED LOESS TUNNEL INITIAL SUPPORT OF ZHENGZHOU—XI?AN PASSENGER RAILWAY |
| ZHANG Aijun1，2，BAI Mingzhou1，XU Zhaoyi1，HUO Yuhua2，BAO Hairong2，LEI Jun2，DU Yanqing1 |
(1. School of Civil Engineering and Architecture，Beijing Jiaotong University，Beijing 100044，China；
2. The Second Construction Engineering Company，China Railway 12th Bureau Group Co.，Ltd.，Taiyuan，Shanxi 032000，China) |
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Abstract Engineering properties of loess is affected obviously by moisture content. Zhangmao tunnel of Zhengzhou—Xi?an passenger railway is through nearly saturated loess with the moisture content of 20%，which is very difficult for construction. The construction geological condition of Zhangmao tunnel is analyzed and the result is made to determine the excavation method. The special excavation method is studied and a specific step of the tunnel continued excavation is given. The excavation technology needs for rapid closure of the construction cutting face. According to the tunnel design，this tunnel has a very large size excavation section. So the three-dimensional non-contact deformation observation methods are studied in order to get information fastly. The characteristics of crown settlement and the two walls convergence after the initial support of the excavation are tested in site for a long time. Combined with earth pressure cells and strain gauge testing on the surface of the initial support，the characteristics of soil pressure and surface contact force on the initial support are studied. The characteristics of deformation and stress of initial support on the condition of seven-step excavation in three steps of nearly saturated loess are obtained. The limit deformation amount characteristics of initial support of the loess tunnel under this kind of tunnel excavation method are summarized and it can be a reference for similar projects.
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Received: 29 December 2010
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2011, Vol. 30 
