砂泥巖互層區超深錨碇基坑施工技術與變形監測*
                                  • 作者: 宋健,李鴻盛,胡風明,等
                                  論文摘要

                                  砂泥巖互層區超深錨碇基坑施工技術與變形監測*

                                  宋健1,李鴻盛1,胡風明1,閆磊2,程龍飛2

                                  (1.中交一公局重慶萬州高速公路有限公司,重慶 404100; 2.重慶三峽學院土木工程學院,重慶 404100)

                                  [摘要]懸索橋重力式錨碇基坑具有開挖體量大、深度大等特點,依據橋址區的地質情況,選擇適宜的基坑開挖、支護、降水技術方案,并進行基坑監測,對確?;邮┕ぐ踩陵P重要。新田長江大橋南岸錨碇基坑位于砂泥巖互層地層中,巖面傾斜,且紅層泥巖是典型的軟巖,屬于誘發邊坡失穩的不利因素。鑒于工程地質的特殊性和相關工程經驗匱乏,依托新田長江大橋南岸錨碇基坑工程,總結了砂泥巖互層地質超深錨碇基坑的放坡開挖技術方案,探討了監測方案并分析了基坑邊坡變形監測成果,發現了基坑邊坡變形具有突變性和長期蠕變性特征,突變位移是導致邊坡變形的主要因素。

                                  [關鍵詞] 懸索橋;深基坑;錨碇;砂泥巖互層;爆破;位移;監測

                                  [中圖分類號]TU753  [文獻標識碼]A          [文章編號]1002-8498(2021)07-0026-05

                                  Construction Technology and Deformation Monitoring of Ultra deep Anchor Foundation Excavation in Sand shale Interbedded Area

                                  SONG Jian1, LI Hongsheng1, HU Fengming1, YAN Lei2, CHENG Longfei2

                                  (1.CCCC First Highway Chongqing Wanzhou Expressway Co., Ltd., Chongqing 404100, China; 2.College of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China)

                                  Abstract: The gravity anchorage foundation of suspension bridge has the characteristics of large excavation volume and large depth. According to the geological conditions of the bridge site, appropriate foundation excavation, support, and dewatering technical solutions are selected, supplemented by foundation excavation monitoring. Ensuring the safety during the construction of the foundation excavation is very important. The anchor foundation excavation on the south bank of the Xintian Yangtze River Bridge is located in the sand shale interbedded stratum, the rock surface is inclined, and the red mudstone is a typical soft rock, which is an unfavorable factor inducing slope instability. In view of the particularity of engineering geology and the lack of relevant engineering experience, relying on the south bank anchorage foundation excavation project of Xintian Yangtze River Bridge, the technical plan for the grading and excavation of the ultra deep anchorage foundation excavation in the sand shale interbedded geology was summarized, and the monitoring plan was introduced. Analyzing the results of the deformation monitoring of the foundation excavation slope, it is found that the deformation of the foundation excavation slope has the characteristics of sudden change and long term creep. The sudden displacement is the main factor leading to the deformation of the slope.

                                  Keywords:suspension bridge; deep foundation excavation; anchored; sand and mudstone interlayer; blasting; displacement; monitoring

                                  *中國博士后科學基金項目(2019M663442);重慶市科委、教委研究項目(cstc2018jscx-msybX0167,KJQN201901219,KJQN202001216

                                  [作者簡介] 宋健,工程師,E-mail: 1083535607@qq.com

                                   

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