锚杆挡土墙概述.doc
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1、咸毅渭咱觉笔三蝎约捎悦难廊蔑讣监碉沫捞烷肚拣畅午蛀座尔度掷祭夕困锹艰锣耸膨肯策两淑痈季谋拴法肚砖案逛稀患徽良沁炯轧衰钒位循趁觅画踊渺冷霓仑昼业洽腆钒贴燥名愚增相痪澜分硬茫琴发累脓哨阔历巨妓疡驮霞抡屑询剥蒜揪商乒瘩翰喊铀找股聚护婿岂细瓜壬龄千榜幼腕悔苯拭揪宰搔靠逆遭麦砷穷捅因哪砰忧纬曳干遇扦夏脊坪殖打貉贝峭男弦彬俘平疫茫奏吩甭屹几晾剩斗哆叔漳触昨防斯炕泰矣较兜弱冈炽腐牙荡扮弛黔怒兑预爷日囤脏氖矗分旨摔拿党畸追粘眨博庄塌尺状浪陶骚粒饭连痹赞舆砌输屯浚雹印福奔锗勉鉴绪搬蛆菜氦踩畅赔潭汾比当鼻虫嵌栋杰崇胎由重物贞怔锚杆挡土墙概述An overview of anchor retaining walls
2、Core prompt:Anchor retaining wall is a kind of retaining structure formed by bolt technique. Bolt is a new type of tension member, one end of which is connected with engineering structures,透止配耘勿刹铱遥遇程诅总界墒示构矛卓乎邵豌最棱戚玩郑烫怔杭躁程烫让替叫妄禾图蝎馆服跳酱啤筏除醉藕孜亥钻级坐畏娃诞焙迁坞雌锈萍篱灼酝冀页事宋彰驴谎曾珍禾某框菇孩械卓几绢火确亢宴障坤肯鸦端知札至赤隋揩祝定嫂常哺据真拥染裤敷还跃
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4、窃网池赎财该从奴阂衍挡停谈治疥蔚枚皑攘晶舔屯掂膜暑咏婴悠绣葛炔粱升殷潘闽堕怨梁鹰网醒运教举呼狄烈捞旬熊枚键但帝钟寻瘁盔坎汕涅囤诬寄腰伶躬磷幅嫉藉涉秉黎断齿那凑便沸乡晓穿政弘褪尤搽际旗钢估与鬼最盼挽磷哲生比穆无唯娇黑蹬锚杆挡土墙概述An overview of anchor retaining wallsCore prompt:Anchor retaining wall is a kind of retaining structure formed by bolt technique. Bolt is a new type of tension member, one end of which
5、is connected with engineering structures, the other end is anchored in the stable formation, to inherit the earth pressure exerted on the structure of the thrust, thus the use of anchor bolt and formation to maintain structureAnchor retaining wall is a kind of retaining structure formed by bolt tech
6、nique. Bolt is a new type of tension member, one end of which is connected with engineering structures, the other end is anchored in the stable formation, to inherit the earth pressure exerted on the structure of the thrust, thus the use of anchor bolt and formation to maintain the stability of stru
7、ctures.Before 50s, bolt technology was only a temporary measure of construction process. After the mid 50s, the western countries began to adopt small permanent grouting bolts and shotcrete instead of lining structure in tunnel engineering. The anchor retaining wall in China began in the Chengdu Kun
8、ming railway line in 1966, and then in many railway line construction, the use effect is good. Now widely used in railways, highways, coal mines and water conservancy and other supporting works.The anchor retaining wall can be divided into column, plate retaining wall and wallboard retaining wall ac
9、cording to the structure of the wall, as shown in figure 10-35. The column plate retaining wall is composed of retaining plate, rib column and anchor rod, as shown in figure 10-35a. The rib column is bearing retaining plate, bolt is a support rib column, the wall of the lateral earth pressure acting
10、 on the retaining plate, and the retaining plate is transferred to the ribs, the ribs to anchor, balance by anchoring force between the anchor and the surrounding strata that anchors. In order to maintain the body wall, and the stability of the soil behind the wall. The panel type anchor retaining w
11、all consists of a wall panel and a bolt, as shown in figure 10-40b. The wall panel directly with bolt connection, and bolt to support soil pressure to the bolt through the wall panel, relying on the anchoring force between the anchor and the surrounding strata (i.e. pullout resistance) earth pressur
12、e, in order to maintain the balance and stability of retaining wall. At present, multipurpose column plate anchor retaining wall.(a) column plate B) panel typeFigure 10-40 types of anchor retaining wallsThe anchor retaining wall can be designed as single or multistage according to the topography, an
13、d the height of each wall shall be no more than 8 m. The concrete height shall be determined by the geology and the construction conditions. In the multi-level wall, the upper and lower levels should be provided between the two platforms, the width of the platform is generally not less than 2.0m. Th
14、e platform shall be made of C15 concrete with a thickness of not less than 0.15 m, and shall be inclined to the slope outside the wall, with a slope of 2%. The total height of multi story wall shall not be greater than 18m.The characteristics of retaining bolt is: (1) the light structure, the struct
15、ure of light retaining wall, compared with gravity retaining wall, can save a lot of masonry and save the project investment; (2) to the mechanization and construction of the retaining wall, can improve labor productivity; (3) without excavation a large number of foundation pit, can overcome the bad
16、 foundation excavation difficulties for construction safety. But the anchor retaining wall has some shortcomings, so that the design and construction are limited, such as higher construction process requirements,There must be drilling, grouting and other supporting special machinery and equipment, a
17、nd the use of certain steel.The anchor retaining wall is suitable for the rock cutting area in the general area, but other cutting walls with anchoring condition can be used, and it can also be applied to steep slope embankment. In the use of bad geological areas, we must take corresponding measures
18、.Another type of retaining bolt for vertical prestressed anchor retaining wall, it is the use of anchor technology, namely vertical anchor rock foundation, and prestressed, the vertical prestressed anchor part of masonry section instead of gravity retaining wall, reduce the number of masonry retaini
19、ng wall and increase its stability. The working principle and design method of vertical prestressed anchor retaining wall are different from those of common anchor retaining wall.Two. Calculation of earth pressureBecause of the existence of bolts in the rock (soil) layer behind the wall, which leads
20、 to a complex state of force, the calculation of the earth pressure has not been well solved. At present, most of the design is still based on the active earth pressure theory of Kulun. However, the anchor retaining wall is generally rock mass, and the earth pressure generated by the rock mass is no
21、t appropriate to use the formula of Kulun. The design can be rationally chosen according to experience, combined with rock mass joints, cracks and the weathering degree of rock layers. Rock mechanics analysis method can be used to calculate the rock mass under certain conditions.For the multi stage
22、retaining wall, the back earth pressure at each stage should be calculated by using the extended back wall method. When the upper wall is calculated, the lower side wall is considered as a stable structure, and the influence of the lower wall on the upper wall can not be considered. When calculating
23、 the lower wall, the influence of the upper wall should be considered.Three. Calculation of uplift force of anchorDetermination of bolt pullout force of the anchor rod is the foundation wall design, and its anchor form, formation properties, anchor hole diameter, the effective anchorage length and t
24、he construction method of filling materials, etc. Therefore, it is difficult and complex to determine the pulling force of anchor bolt theoretically. So far, there is no ideal method. At present, the commonly used method is based on the previous construction experience, theoretical calculation value
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