2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、1600 英文單詞, 英文單詞,8700 英文字符,中文 英文字符,中文 2500 字文獻(xiàn)出處: 文獻(xiàn)出處:Nikitenko M , Boiko I , Sernov V , et al. Anchorage of Retaining Walls and Antilandslide Structures[J]. Procedia Engineering, 2013, 57:808-813.Anchorage of Retaining

2、Walls and Antilandslide StructuresMikhail Nikitenko , I. Boiko , V. Sernov , N. Chernoshey , Natalie SikoraeAbstractThe article describes the experience of designing, arrangement and testing of anchors for fixing the pro

3、tection of deep foundation pits in narrow urban areas on various construction projects during the reconstruction.Keywords: retaining wall, anchor, trials.There are various types of fencing when deep foundation pits are o

4、rganized. The most widespread one is pile-beam-type fencing (so-called Berlin support). You can see such structure in Fig. 1. This fencing was used in Minsk in Shornaya street. Such structure provides steadiness through

5、the organized inclined earthfill without anchorage from one side of the pit and through the possibility of shifting of the fencing in the direction of the excavation from the other side of the foundation pit.Disadvantage

6、s of pile-beam-type fencing:1. Heavy expenses of steel section in short supply for installation of support.2. Heavy expenses of timber, which is used for horizontal sheeting between supports.3. Adverse dynamic influence

7、on surrounding buildings during the driving double tees. The driving double tees into boreholes helps to reduce this influence.Fig. 1. Pile-beam-type fencing without anchors of deep foundation pitFencing in the form of t

8、rench or pile walls haven’t got disadvantages mentioned above. Moreover, such fencing can combine load-bearing and antifiltering functions during the embedding in aquifuge.If the foundation pit is more than 7 meters deep

9、 the steadiness of trench walls is provided by setting-up of one or several tiers of strut rails or anchors for perception of horizontal stress of soil and for perception of vertical load. This makes it possible to reduc

10、e necessary jamming depth of walls lower the bottom.Technology, which implements the injection of piles or anchors and which also strengthens Fig. 4. Assembly of anchor bars according to author's certificate No 13922

11、03 at the bottom of foundation pit (a) and sinking of bars into the hole (b)Quality pressing of surrounding soil during the controlled process of mortar injection can:1. Increase bearing capacity of anchors2. Reduce ceme

12、nt consumption3. Reduce term of increase in cement stone’s durability even in clay soil.Use of multimetallic water concentrate additive in mortar gave the possibility to strain anchors in 7 days after injection in morain

13、e clay sand and 2,5 days in sand according to Standards of Belarus 1113-98.Work in production and testing anchors being under scientists’ observation and theirs calculations of deflected mode made it possible to decrease

14、 the number of anchors’ tiers and to decrease total amount of anchors by 22,4%, i.e. from 2137 to 1659 pieces.CIDH (Cast-in-drilled-hole) anchors were applied in the foundation of 120-metre-long arch cover in Vitebsk amp

15、hitheatre. Southern part across Gogol street near the location of foundation Fn1 has a scarp 5 meters high with a tip 30– 45°. Geological feature was represented as fine sand, gravel sand, sandy clay and calcic dolo

16、mite. Subterranean water was detected near the ground surface.There were applied bored and cast-in-place piles with injection pressing of soil under the pile’s end. Part of the horizontal stress was taken by inclined pre

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