西安建筑科技大学学报(自然科学版)

土压平衡矩形顶管正面附加推力对地表隆起变形影响研究

(1.内蒙古科技大学土木工程学院,内蒙古包头 014010; 2.内蒙古路桥集团有限责任公司,内蒙古呼和浩特 010052)

关键词：地表快速隆起变形; 正面附加推力; 刀盘挤土压力; 刀盘转速比; 顶进速度

Study on the effect of positive additional thrust on the surface uplift deformation by the construction of the rectangular pipe jacking with earth pressure balance

XU Youjun¹, ZHANG Zhihua¹, SHI Ming¹, WANG Wanhua², KANG Jiawang¹

(1.The School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010,China; 2. Inner Mongolia Road and Bridge Group Co. Ltd.,Huhhot 010052,China)

Keywords： surface rapid uplift deformation; positive additional thrust; the pressure on the cutter to squeeze the soil; the proportion of cutter rotate speed; speed of pipe jacking machine

DOI: 10.15986-j.1006-7930.2019.06.007

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参考文献

以全国最长的大截面矩形顶管综合管廊工程为背景,基于弹性力学Mindlin解和随机介质理论,分析顶管施工对地表隆起变形的影响.研究发现:地表隆起过程可分为四个阶段,分别为缓慢隆起阶段、快速隆起阶段、沉降阶段和稳定阶段,并得到地表隆起超限主要集中在快速隆起阶段,该阶段地表快速隆起变形的主要诱因是正面附加推力,其次为顶管机摩擦力和后续管节摩擦力; 刀盘挤土压力对正面附加推力影响很大,基于弹性力学Kelvin解,并引入刀盘转速比,得到大、小刀盘转速比在0～0.2范围内时对刀盘挤土压力影响很大; 基于进出土平衡理论,并引入螺旋机转速比,得到它对刀盘开口处土压力影响很小,但顶进速度对刀盘开口处土压力影响很大; 综合各因素得知,在矩形顶管施工参数中,刀盘转速比和顶进速度对正面附加推力影响很大,是造成地表隆起变形的主要原因.

This paper study the influence of top pipe construction on ground surface uplift deformation, which is based upon Elastic mechanics Mindlin solution and stochastic medium theory, and the nation's longest large-section rectangular pipe jacking utility project. The process of surface uplift deformation can be divided for four stages, including slow uplift stage, rapid uplift stage, subsidence stage and stabilization stage. The transfinite surface uplift deformation mainly focus on the rapid uplift stage that main inducement is the positive additional thrust, and second inducement is the pipe jacking friction and following pipe joint friction. It is a large influence element for the pressure on the cutter to squeeze the soil to the proportion of big and small cutter rotate speed when it's range from 0 to 0.2, based on elastic mechanics Kelvin solution. Based on the theory of in and out soil balance, we bring in the proportion of screw machine rotate speed, it is a small influence element for the earth pressure at cutter opening, but speed of pipe jacking machine is a large influence element for it. To conclusion, the proportion of cutter rotate speed and speed of pipe jacking are a large influence element for the positive additional thrust, and then for the surface uplift deformation.

引言
1 矩形顶管力学模型建立
2 正面附加推力确定
3 依托工程背景
4 矩形顶管机正面附加推力的确定与其对地表隆起的影响
5 结论

图1 矩形顶管Mindlin解力学计算简图<br/>Fig.1 Schematic diagram ofMindlin solution mechanics calculation of rectangular tube jacking

图1 矩形顶管Mindlin解力学计算简图
Fig.1 Schematic diagram ofMindlin solution mechanics calculation of rectangular tube jacking

图2 随机介质理论计算力学简图<br/>Fig.2 Schematic diagram of stochastic medium theory calculation mechanics

图2 随机介质理论计算力学简图
Fig.2 Schematic diagram of stochastic medium theory calculation mechanics

图3 刀盘转动示意图<br/>Fig.3 Schematic diagram of knife wheel rotation

图3 刀盘转动示意图
Fig.3 Schematic diagram of knife wheel rotation

图4 土体微元计算示意图<br/>Fig.4 Schematic diagram of soil infinitesimal element calculation

图4 土体微元计算示意图
Fig.4 Schematic diagram of soil infinitesimal element calculation

图5 刀盘布置图
Fig.5 Cutter head layout

图6 顶管隧道所处地层分布图<br/>Fig.6 The stratigraphic distribution of the pipe jacking tunnel

图6 顶管隧道所处地层分布图
Fig.6 The stratigraphic distribution of the pipe jacking tunnel

图7 测点布置图<br/>Fig.7 Measuring point layout

图7 测点布置图
Fig.7 Measuring point layout

图8 测点埋设示意图<br/>Fig.8 Schematic diagram of measuring point burial

图8 测点埋设示意图
Fig.8 Schematic diagram of measuring point burial

图9 地表沉降点的钻孔实物图<br/>Fig.9 Physical borehole drawings of Ground surface settlement points

图9 地表沉降点的钻孔实物图
Fig.9 Physical borehole drawings of Ground surface settlement points

图10 地表纵向变形对比图<br/>Fig.10 Comparison of ground surface longitudinal deformation

图10 地表纵向变形对比图
Fig.10 Comparison of ground surface longitudinal deformation

图11 地表横向变形图<br/>Fig.11 Transverse deformation of theground surface

图11 地表横向变形图
Fig.11 Transverse deformation of theground surface

图12 各因素引起地表纵向变形图<br/>Fig.12 The longitudinal deformation of the ground surface caused by various factors

图12 各因素引起地表纵向变形图
Fig.12 The longitudinal deformation of the ground surface caused by various factors

图13 快速隆起阶段各因素占比图<br/>Fig.13 The proportion diagram of each factor in the stage of rapid uplift

图13 快速隆起阶段各因素占比图
Fig.13 The proportion diagram of each factor in the stage of rapid uplift

图14 顶管机正面推力组成因素占比图<br/>Fig.14 Figure of component ratio of frontal thrust of pipe jacking machine

图14 顶管机正面推力组成因素占比图
Fig.14 Figure of component ratio of frontal thrust of pipe jacking machine

图15 刀盘挤土压力组成因素占比图<br/>Fig.15 Diagram of the composition factors of the squeeze pressure of cutter head

图15 刀盘挤土压力组成因素占比图
Fig.15 Diagram of the composition factors of the squeeze pressure of cutter head

表1 刀盘参数计算表<br/>Tab.1 Cutter head parameter calculation table

表1 刀盘参数计算表
Tab.1 Cutter head parameter calculation table

表2 螺旋机参数计算表<br/>Tab.2 Calculation table of screw machine parameters

表2 螺旋机参数计算表
Tab.2 Calculation table of screw machine parameters

图16 刀盘挤土压力与刀盘转速比函数图<br/>Fig.16 The function diagram of the ratio between the extruding pressure and the rotating speed of the cutter head

图16 刀盘挤土压力与刀盘转速比函数图
Fig.16 The function diagram of the ratio between the extruding pressure and the rotating speed of the cutter head

图17 螺旋机转速图<br/>Fig.17 Screw machine speed diagram

图17 螺旋机转速图
Fig.17 Screw machine speed diagram

图18 刀盘转速拟合图<br/>Fig.18 Cutter speed fitting diagram

图18 刀盘转速拟合图
Fig.18 Cutter speed fitting diagram

图19 正面附加推力函数图<br/>Fig.19 Frontal additional thrust function diagram

图19 正面附加推力函数图
Fig.19 Frontal additional thrust function diagram

图20 p1=410 kPa时D12点的变形示意图<br/>Fig.20 The deformation diagram of D12 whenp1=410 kPa

图20 p1=410 kPa时D12点的变形示意图
Fig.20 The deformation diagram of D12 whenp1=410 kPa

图21 p1=210 kPa时D12点的变形示意图<br/>Fig.21 The deformation diagram of D12 whenp1=210 kPa

图21 p1=210 kPa时D12点的变形示意图
Fig.21 The deformation diagram of D12 whenp1=210 kPa

图22 p1=110 kPa时D12点的变形示意图<br/>Fig.22 The deformation diagram of D12 whenp1=110 kPa

图22 p1=110 kPa时D12点的变形示意图
Fig.22 The deformation diagram of D12 whenp1=110 kPa

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期刊信息

西安建筑科技大学学报(自然科学版)
（1957年创刊双月刊）

主管单位：陕西省教育厅

主办单位：西安建筑科技大学

主　　编：刘加平（院士）

副主编：史庆轩（常务）张引科张小龙

国内刊号：CN61-1295/TU

I S S N：1006-7930

地　　址：西安市雁塔路中段13号

国内发行：西安建筑科技大学学报编辑部

国外发行：中国出版对外贸易总公司

编辑出版：西安建筑科技大学学报编辑部

备注

引言

1 矩形顶管力学模型建立

2 正面附加推力确定

3 依托工程背景

4 矩形顶管机正面附加推力的确定与其对地表隆起的影响

5 结论

期刊信息