884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(1 湘潭大學(xué)土木工程與力學(xué)學(xué)院， 湘潭 411105；  2 岳陽(yáng)市公路橋梁基建總公司， 岳陽(yáng) 414021)

［摘要］以長(zhǎng)沙地鐵5號(hào)線二標(biāo)晚報(bào)大道站富水砂卵石地層深基坑降水開(kāi)挖工程為依托，在鉆孔灌注樁+旋噴樁止水帷幕的設(shè)計(jì)方案下，首先，給出了該車站深基坑止水帷幕水平位移及周邊地表沉降的監(jiān)測(cè)方案，完成了現(xiàn)場(chǎng)監(jiān)測(cè)工作； 并根據(jù)監(jiān)測(cè)結(jié)果分析了止水帷幕水平位移及周邊地表沉降隨著基坑開(kāi)挖的變化規(guī)律。然后，采用ABAQUS軟件對(duì)該車站深基坑降水開(kāi)挖進(jìn)行了全過(guò)程數(shù)值模擬，在對(duì)止水帷幕水平位移和周邊地表沉降模擬值與現(xiàn)場(chǎng)實(shí)測(cè)值進(jìn)行對(duì)比、驗(yàn)證的基礎(chǔ)上，就止水帷幕滲透系數(shù)、嵌入巖體深度和橫向支撐對(duì)止水帷幕水平位移及地表沉降的影響進(jìn)行了研究。結(jié)果表明：橫向支撐結(jié)構(gòu)能有效提高基坑穩(wěn)定性，止水帷幕嵌入巖體深度建議保持在3～7m為宜，可為富水砂卵石地層止水帷幕嵌入巖體深度的合理設(shè)計(jì)與基坑安全施工提供參考依據(jù)。

［關(guān)鍵詞］富水砂卵石地層； 基坑開(kāi)挖； 止水帷幕水平位移； 地表沉降； 監(jiān)測(cè)； 數(shù)值模擬

中圖分類號(hào)：TU478文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)23-0128-06

Deformation monitoring and numerical analysis of deep foundation pit excavation in water-rich sandy cobble stratum

LUO Zhengdong1, WU Peng1, HUANG He2, YIN Hongda2

(1 School of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China；2 Yueyang Road and Bridges Base Construction General Company, Yueyang 414021, China)

Abstract:Relying on dewatering and excavation project of deep foundation pit of Wanbao Dadao station of second bid of Changsha Metro Line 5 in water-rich sandy cobble stratum, under the design plan of bored piled and jet grouting pile water-stop curtain, first, the monitoring scheme for the horizontal displacement of the water-stop curtain and the surrounding surface settlement of deep foundation pit of the station was given and the on-site monitoring work was completed； according to the monitoring results, the change law of the horizontal displacement of the water-stop curtain and the surrounding surface settlement with the excavation of foundation pit was analyzed. Then, the ABAQUS software was used to carry out the whole process numerical simulation of the deep foundation pit dewatering and excavation of the station. On the basis of comparing and verifying simulation value and actual measured value of the horizontal displacement of the water-stop curtain and the surrounding surface settlement, the influence of the permeability coefficient and the depth of the embedded rock mass of the water-stop curtain and the lateral support on the horizontal displacement of the water-stop curtain and the surface settlement were studied. The results show that the lateral support structure can effectively improve the stability of the foundation pit. The depth of embedded rock mass of the water-stop curtain is recommended to be 3～7m, which can provide reference basis for reasonable design of the depth of embedded rock mass of the water-stop curtain and safe construction of foundation pit in water-rich sandy cobble stratum.

Keywords:water-rich sandy cobble stratum； excavation of foundation pit； horizontal displacement of water-stop curtain； surface settlement； monitor； numerical simulation

*國(guó)家自然科學(xué)基金資助項(xiàng)目(51508489)，湖南省教育廳項(xiàng)目(16C1548)。

作者簡(jiǎn)介：羅正東，博士，高級(jí)工程師，Email：2628365162@qq.com； 通信作者：吳鵬，碩士，Email：1145448633@qq.com。