本文選題：懸索橋　切入點(diǎn)：重力式錨碇　出處：《交通運(yùn)輸工程學(xué)報(bào)》2017年02期

【摘要】：基于普宣高速公路宣威岸重力式錨碇工程,設(shè)計(jì)了不回填無預(yù)應(yīng)力、不回填有預(yù)應(yīng)力和回填有預(yù)應(yīng)力3種計(jì)算工況,利用數(shù)值仿真試驗(yàn)分析了重力式錨碇和地基的力學(xué)機(jī)制和破壞模式。承載機(jī)制表明:8倍設(shè)計(jì)荷載之前沒有塑性變形,為彈性工作狀態(tài),最大變形在錨巖界面,摩擦效應(yīng)居主導(dǎo),基底拉應(yīng)力區(qū)可控,錨碇結(jié)構(gòu)抗滑移和抗傾覆性均處于穩(wěn)定可控狀態(tài);12倍設(shè)計(jì)荷載之后塑性區(qū)逐步擴(kuò)展,達(dá)到20倍設(shè)計(jì)荷載時(shí)全部貫通,基底塑性變形明顯,錨碇結(jié)構(gòu)變形顯著,基底夾持巖體剪切破壞,夾持效應(yīng)居主導(dǎo),基底拉應(yīng)力區(qū)不可控,錨碇結(jié)構(gòu)抗滑移和抗傾覆性均處于不可控狀態(tài);錨碇施加的預(yù)應(yīng)力只在結(jié)構(gòu)-巖基協(xié)調(diào)變形之前起作用,之后影響不大;回填可以極大地改善基底應(yīng)力狀態(tài)與結(jié)構(gòu)扭轉(zhuǎn)變形、抗滑移和抗傾覆穩(wěn)定性,可在容許變形范圍內(nèi)適當(dāng)考慮增強(qiáng)效應(yīng)�？梢�,重力式錨碇結(jié)構(gòu)-地基協(xié)調(diào)變形與聯(lián)合承載機(jī)制,表現(xiàn)為摩擦效應(yīng)、夾持效應(yīng)和回填效應(yīng)的綜合作用。監(jiān)測(cè)結(jié)果顯示:通過基底拉應(yīng)力和壓應(yīng)力監(jiān)控結(jié)構(gòu)與地基接觸面安全性,監(jiān)測(cè)值小于地基容許承載力3MPa;通過基底變位和地基深部水平位移監(jiān)控結(jié)構(gòu)抗滑移穩(wěn)定性,實(shí)際工程監(jiān)測(cè)值小于1mm;通過角點(diǎn)不均勻沉降監(jiān)控錨碇抗傾覆穩(wěn)定性,傾斜值小于0.006;通過大體積混凝土溫控監(jiān)測(cè)可知,內(nèi)部最高溫度小于60℃,進(jìn)出水溫差小于15℃,內(nèi)表溫差小于20℃,峰后降溫速率小于3℃·d~(-1);錨束鎖固荷載監(jiān)測(cè)變化幅值不超過設(shè)計(jì)值的5%。
[Abstract]:Based on the gravity Anchorage project of Xuanwei Bank of Puxuan Expressway, three calculation conditions are designed: no backfilling without prestress, no backfilling with prestress and backfilling with prestress.The mechanical mechanism and failure mode of gravity Anchorage and foundation are analyzed by numerical simulation test.The load-bearing mechanism shows that there is no plastic deformation before the design load of: 8 times, which is an elastic working state. The maximum deformation is at the interface of the anchor rock, the friction effect is dominant, and the tensile stress zone of the basement is controllable.After 12 times of design load, the plastic zone of Anchorage structure is gradually expanded after 12 times of design load in stable and controllable state. When the load reaches 20 times of design load, the plastic deformation of the base is obvious, the deformation of the Anchorage structure is obvious, and the deformation of the Anchorage structure is obvious.The shear failure of the basement clamped rock mass, the dominant clamping effect, the uncontrollable tensile stress zone of the basement, the uncontrollable anti-slip and anti-overturning properties of the Anchorage structure, and the prestress exerted by the Anchorage only act before the structure-rock foundation coordinated deformation.The backfill can greatly improve the stress state of the base and the torsional deformation of the structure, and the stability of anti-slip and anti-overturning. The reinforcement effect can be considered properly within the allowable deformation range.It can be seen that the coordinated deformation and combined bearing mechanism of gravity Anchorage structure and foundation are the combined effects of friction effect, clamping effect and backfill effect.The monitoring results show that the monitoring value is less than 3 MPa of the allowable bearing capacity of the foundation through the monitoring of the safety of the interface between the structure and the foundation by the tensile stress and compressive stress of the foundation, and the stability of the structure against sliding is monitored by the displacement of the base and the horizontal displacement of the deep foundation.The actual engineering monitoring value is less than 1mm; the anti-overturning stability of Anchorage is monitored by uneven settlement of corner point, the inclination value is less than 0.006; through the temperature control monitoring of mass concrete, the maximum internal temperature is less than 60 鈩，

本文編號(hào)：1707103