顶管施工对邻近地下管线的影响预测分析  

Prediction for response of adjacent pipelines induced by pipe jacking construction

作　　者：魏纲[1] 朱奎[2] 

机构地区：[1]浙江大学城市学院土木工程系,杭州310015 [2]浙江大学岩土工程研究所,杭州310027

出　　处：《岩土力学》2009年第3期825-831,共7页Rock and Soil Mechanics

基　　金：浙江省教育厅科研资助项目(No.20070180);浙江大学城市学院教师科研基金资助项目

摘　　要：采用通用Peck公式计算顶管施工引起的地下管线平面处的土体竖向位移。对地下管线的受力模型进行简化,基于Winkler地基模型,得到地下管线由于顶管开挖引起的极限弯矩、理论弯矩以及管线变形的计算方法。通过算例分析,与连续弹性解、Attewell解和王涛解的计算结果进行比较,探讨了土质条件、管线材质、管线埋深、管线管径对地下管线受力的影响。计算结果表明,本方法适用于各种土质,可较好地预估管线所受弯矩,且不会低估管线所受的最大弯矩;在相同条件下,管线埋深越大承受的弯矩也越大,但埋深仅对最大正弯矩和最大负弯矩位置附近处的管线影响较大,对其余部位影响较小;管线抗弯刚度越大,管线承受的极限弯矩和影响范围也越大;管线管径越大,管线承受的弯矩也越大。The general Peck empirical formula is used for calculating vertical displacement of soil at the plane of buffed pipeline caused by pipe jacking construction. The force model of buried pipeline is simplified. Based on Winkler foundation model, calculation methods for calculating ultimate and theoretic bending moments and pipeline deformation affected by pipe jacking construction are obtained. Through analyzing examples the solution is compared with Attwell＇s solution and Wangtao＇s solution. The influences of soil condition, material of pipeline, huffed depth and diameter of pipeline on the force of buffed pipeline are discussed. The results show that the method can be applied to any soil condition and predict bending moment of buffed pipeline well; and the maximum bending moment of the pipeline will not be underestimated. Under the same condition, the deeper of buried depth of pipeline is, the larger bending moment of buried pipeline is. However, the effect of pipeline depth is not obvious except on the pipeline near the positions of maximum positive bending moment and maximum negative bending moment. The ultimate bending moment and influence zone of pipeline increase with the increase of bending stiffness of pipeline. The larger diameter of buried pipeline is, the larger bending moment of buried pipeline is.

关 键 词：顶管施工 地下管线 WINKLER地基模型 管线弯矩 

分 类 号：TU433[建筑科学—岩土工程]