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NUMERICAL ANALYSES OF ACTIVE EARTH PRESSURE ON RIGID RETAINING WALL
刚性挡土墙主动土压力数值分析

Chen Yekai,Wang Yimin,Xu Riqing,Gong Xiaonan,
陈页开
,汪益敏,徐日庆,龚晓南

岩石力学与工程学报 , 2004,
Abstract: In this paper, numerical analyses for active earth pressure problems of rigid retaining wall are performed,aiming at improving understanding of the factors governing the magnitudes and distributions of the earth pressures on retaining wall. Active earth pressure problems are analyzed by using a Mohr-Coulomb constitutive model of soil. A method to describe the frictional behavior between soil and wall is proposed using the elastoplastic joint elements. The computed variations of earth pressure with wall displacement in active states explain well the influence of the wall friction and the wall movement.
NUMERICAL ANALYSES OF PASSIVE EARTH PRESSURE ON RIGID RETAINING WALL
刚性挡土墙被动土压力数值分析

Chen Yekai,Wang Yimin,Xu Riqing,Gong Xiaonan,
陈页开 汪益敏
,徐日庆 龚晓南

岩石力学与工程学报 , 2004,
Abstract: In this paper,numerical analyses for passive earth pressure problems of the rigid retaining wall are performed,aiming at improving understanding of the factors governing the magnitudes and distributions of the earth pressures on retaining walls. Passive earth pressure problems are analyzed by using a Mohr-Coulomb constitutive model of soil. A method to describe the frictional behavior between soil and walls is proposed using the elastoplastic joint elements. The computed variations of earth pressure with wall displacement in passive states explain well the influence of the wall friction and the wall movement.
Earth Pressure of Retaining Structure Induced by Subgrade under Rainfall  [PDF]
Yuwei Zhang, Junzhi Lin, Jun Zhao
Open Journal of Civil Engineering (OJCE) , 2016, DOI: 10.4236/ojce.2016.63042
Abstract: This article selects the retaining wall as the research object, introducing the rainfall infiltration model, considering the infiltration of rainwater into the groundwater recharge, analysizing the variation of earth pressure in the subgrade retaining wall. On this occasion, the back of retaining wall produces stable seepage water and compares with the non drainage water body. The results show that, with the infiltration of rainwater into the groundwater recharge, the greater the active earth pressure under the condition of rainfall appears, more quickly the active earth pressure of the retaining wall with the drainage body increases. The matrix suction of unsaturated soils, which is infiltrated into soil of subgrade, has a positive effect on the shear strength of the earth pressure.
DESIGN OF RETAINING WALLS WITH ANTI-SLIDE TIE
带抗滑键的挡土墙设计

He Siming,Zhu Pingyi,Zhang Xiaogang,
何思明
,朱平一,张小刚

岩石力学与工程学报 , 2003,
Abstract: The design theory of retaining walls with anti-slide tie is studied systematically, and a new method on the design of retaining wall is presented. A nonlinear earth pressure coefficient formula of the earth pressure changing with retaining wall displacement is proposed, and load-deformation relationships of anti-slide tie under horizontal loading are discussed. The proposed method is applied to design of retaining wall with anti-slide tie. Through a case study, the results confirm that the proposed method is reasonable.
PREDICTION OF RETAINING STRUCTURE DISPLACEMENT IN FOUNDATION PIT
深基坑支护结构变形计算

Chen Canshou,Zhang Shanggen,Yu Youshan,
陈灿寿
,张尚根,余有山

岩石力学与工程学报 , 2004,
Abstract: An approach for predicting the displacement of the retaining structure of foundation pit is proposed based on in-situ data,optimum back analysis and elastic finite element method. With the monitoring information of displacement in the process of deep excavation,the optimum back analysis is used to calculate the properties of soils and retaining structure,which are then applied to predict the displacement of the retaining structure in the next stage. The back analysis is repeated in subsequent stages until the end of excavation. The results of back analysis provide guidance on design and construction of deep excavation and assessment on the security of excavation operation.
FORMULA OF RANKINE PASSIVE EARTH PRESSURE IN TRIAXIAL STATE OF STRESS
三向应力作用下的Rankine被动土压力公式

CHEN Qiu-nan,ZHANG Yong-xing,ZHOU Xiao-ping,
陈秋南
,张永兴,周小平

岩石力学与工程学报 , 2005,
Abstract: The traditional formula of Rankine passive earth pressure of retaining wall is deduced based on Mohr-Coulomb strength theory in which the intermediate principal stress is not considered. In this paper,the formula of Rankine passive earth pressure of retaining wall in triaxial state of stress is established based on twin shear strength theory. A calculation example shows that the passive earth pressure of retaining wall is increased when the influence of the intermediate principal stress is considered.
CALCULATION PRINCIPLE OF EARTH PRESSURE AGAINST RETAINING PILES OF PILE-ROW RETAINING STRUCTURE
桩排式支护护壁桩侧土压力计算原理

Hu Minyun,Xia Yongcheng,Gao Quqing,
胡敏云
,夏永承,高渠清

岩石力学与工程学报 , 2000,
Abstract: According to the working characters of retaining piles for deep excavation, the arching effect in adjoining soil is analyzed. The earth pressure against the retaining piles with interval consists of two parts: direct and indirect earth pressure. The calculation principle of earth pressure using principal stress arching is proposed.
地震荷载作用下加筋土挡墙动力特性分析
Dynamic Characteristic Analysis of Reinforced Earth Retaining Walls under Seismic Load
 [PDF]

吴燕开,李纪兴,石玉斌,金洪东,胡晓士
- , 2017, DOI: 10.3969/j.issn.1000-0844.2017.03.0475
Abstract: 利用有限元软件对加筋土挡墙在地震荷载作用下的动力特性进行模拟分析,重点分析其在不同加筋长度、加筋间距以及峰值加速度条件下的动力响应特性。通过有限元分析一个高6 m、底部为基础土的加筋土挡墙在地震荷载作用下的行为,针对理想化墙体研究加筋土挡墙的某些动力特性。模拟计算结果表明加筋土挡墙的加筋长度、加筋间距以及峰值加速度的变化对其水平位移、沉降及受力有较大影响。采用长度大的加筋材料可以有效减小加筋土挡墙的水平位移,但这样将导致加筋拉伸荷载的增大,同时也将导致加筋土挡墙的隆起增大。峰值加速度的大小对加筋土挡墙的水平位移有很大影响,当峰值加速度增大时水平位移也随之增大,但并不呈线性增长关系。减小加筋间距会有效地限制加筋土挡墙面板整体的水平位移,但在一定范围内减小加筋间距也会使加筋区域内土体底部挡墙的水平位移出现相对增大的现象,因此通过减小加筋间距来限制加筋土挡墙的位移在一定程度上具有局限性。
In this study, the dynamic properties of reinforced earth retaining walls under seismic load were analyzed by using Plaxis, a finite element analysis software program. The analysis focused on the dynamic response characteristics of the wall under the influence of different reinforcement lengths, reinforcement spacing, and peak acceleration, assuming an ideal wall with a height of 6 m and a base in foundation soil. Through simulations, it was determined that changes in reinforcement length, reinforcement spacing, and peak acceleration had the strongest influence on the horizontal displacement, vertical settlement, and stress in the reinforcement materials of the earth retaining wall. The horizontal displacement of a wall can be effectively reduced by using reinforced materials of longer length. However, this will lead to an increase in reinforced tensile load, and an uplift of reinforced earth retaining wall. The value of peak acceleration has the greatest influence on the horizontal displacement of wall. Although increases in horizontal displacement result from increases in peak acceleration, it is not a linear relationship. Decreases in reinforcement spacing can also effectively limit the overall horizontal displacement of wall, however, across a certain range, it can result in a relative increase in bottom of wall horizontal displacement. Therefore, reducing the displacement of a wall by decreasing the reinforcement spacing is only useful to a limited extent.
An Automated Inner Dimensional Measurement System Based on a Laser Displacement Sensor for Long-Stepped Pipes  [PDF]
Fumin Zhang,Xinghua Qu,Jianfei Ouyang
Sensors , 2012, DOI: 10.3390/s120505824
Abstract: A novel measurement prototype based on a mobile vehicle that carries a laser scanning sensor is proposed. The prototype is intended for the automated measurement of the interior 3D geometry of large-diameter long-stepped pipes. The laser displacement sensor, which has a small measurement range, is mounted on an extended arm of known length. It is scanned to improve the measurement accuracy for large-sized pipes. A fixing mechanism based on two sections is designed to ensure that the stepped pipe is concentric with the axis of rotation of the system. Data are acquired in a cylindrical coordinate system and fitted in a circle to determine diameter. Systematic errors covering arm length, tilt, and offset errors are analyzed and calibrated. The proposed system is applied to sample parts and the results are discussed to verify its effectiveness. This technique measures a diameter of 600 mm with an uncertainty of 0.02 mm at a 95% confidence probability. A repeatability test is performed to examine precision, which is 1.1 μm. A laser tracker is used to verify the measurement accuracy of the system, which is evaluated as 9 μm within a diameter of 600 mm.
柔性挡土结构空间土压力性状的三维有限元分析
Three-dimensional Finite Element Analysis on Earth Pressure Behavior of Flexible Retaining Structure
 [PDF]

王成华,,
- , 2017,
Abstract: 为了研究基坑开挖对柔性挡土结构土压力空间分布规律的影响,进而为基坑的设计与安全防护提供相应依据,用ABAQUS建立基坑开挖的有限元模型,分析基坑开挖对挡土结构“单片墙”空间土压力的影响。考虑了不同刚度、有无支撑、不同开挖深度对挡土墙不同部位的土压力分布和挡土墙位移的影响,并将挡土结构三维土压力分布规律与二维数据进行了对比,验证了三维有限元模拟的必要性,对比了加支撑与否对基坑土压力空间分布的影响。结果表明:“单片墙”主动区土压力呈马鞍状分布,挡土结构后部土体的影响范围和下部土体的影响范围都约为2倍开挖深度;支撑结构极大地限制了墙后土体危险区域的范围,但是对墙下土体的限制作用并不是很明显。
In order to investigate the influence of foundation pit excavation on the earth pressure spatial distribution law of flexible retaining structure, and to provide references for the design and safety protection of foundation pit,the finite element model of foundation pit excavation was established by ABAQUS and the influence of the foundation pit excavation on spatial earth pressure of retaining structure “monolithic wall”. The influences of different stiffness, with and without supports, different excavation depths on the earth pressure distribution and the displacement of different parts in retaining wall were considered. The three-dimensional earth pressure distribution of the retaining structure was compared with the two-dimensional data, and the necessity of three-dimensional finite element simulation was verified. The results show that “monolithic wall” active earth pressure zone appears a saddle shaped distribution, and the influence ranges of the behind and the bottom of retaining structure are about 2 times of excavation depth.Supporting structure greatly limits the scope of earth dangerous area behind the wall, but has no obvious limiting effect on the bottom of retaining structure
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