【正文】 當沉降分析結果表明無碴軌道不能在計劃的工期鋪設時，則要研究確定是延長路基擺放時間，還是采取調(diào)整預壓土高度、調(diào)整預壓土卸荷時間、增加地基加固等工程措施。After filled the subgrade or preloading, it shall have more than 6 months observation and adjustment period, the continuously settlement observation is more than 6 months. According to the observation data up to 6 months, it shall be drawn the timesettlement curve. According to the actual settlement data analysis to calculate the total settlement, after work settlement, and it shall be primarily determined the time to install the slab track. When the observed data is not sufficient to assess or the after work settlement can not satisfy the design requirement, it shall continuously observe or adopt measure to increase or control the settlement（6） 在 3 個月后進行第一次預測，根據(jù) 3 個月的監(jiān)測數(shù)據(jù)，繪制“時間沉降量曲線，按實測沉降數(shù)據(jù)初步預測 6 月的沉降量及剩余沉降量，以決定運架梁的時間。the difference between the designed settlement calculated total settlement and forecasted total settlement that used the actual measured data is unadvisable larger than 10mm. （5） 路基填筑完成或施加預壓荷載后應有不少于 6 個月的觀測和調(diào)整期，持續(xù)沉降觀測不少于 6 個月的時間，根據(jù)這 6 個月以上的監(jiān)測數(shù)據(jù)，繪制“時間 沉降量 曲線，按實測沉降數(shù)據(jù)推算分析并推算總沉降量、工后沉降值，初步確定鋪軌時間。 The forecasted final settlement value 注：沉降和時間以路基填筑完成或堆載預壓后為起始點。黃土地區(qū)沉降曲線適合用何種方法推算工后沉降，需要在路基沉降預測時具體分析研究。Construction procedure, construction check and filling, gradated, foundation and paction inspection situation etc construction data. （4） 施工質(zhì)量控制過程和抽檢情況等監(jiān)理資料。The subgrade settlement observation data （2） 路基地段的線路設計縱斷面圖、工程地質(zhì)縱橫斷面圖、設計圖紙和說明書、沉降計算報告(包括不同階段的設計沉降值與時間的關系曲線)等17 / 84相關設計資料。sn is the time section that means every n days the settlement, is the time ns?section that means every n days the settlement accumulated value), in the same drawing it shall be drawn the settlement standard curve, the curve see the drawing 4.（3） 對沉降觀測資料及時分析，尤其是在預壓期，應對路基沉降的發(fā)展趨勢進行分析，分析意見及時報鄭西公司和咨詢項目部，以便在必要時采取補救措施。It shall be used the uniform ZhengXi PDL subgrade settlement observation recording table (see the attached table) to record and coordinate the observation data.（2） 根據(jù)觀測資料，及時完成有關圖表的繪制，主要包括：according to the observation data, it shall be finished the diagram in time, mainly contained:1) 每個觀測標志點的荷載——時間——沉降曲線；the loadtimesettlement curve for every observation symbol point2) 產(chǎn)生沉降的各層壓縮量與時間的關系曲線，即每層的時間——荷載——壓縮量曲線。Under the condition that the settlement equipment embedded basically can not influence the construction, the subgrade construction shall be rolled uniformity, the quality is consistency, and the settlement observation data have the well representative.4．為了分析施工期沉降和工后沉降、施工期沉降與總沉降的關系以及驗證推算工后沉降方法的準確性，對部分有代表性路基（暫定工程試驗段） ，進行運營期間的長期沉降觀測，以期得到最終沉降量。觀測設施的埋設及沉降觀測工作應按本方案所要求，不能影響路基填筑質(zhì)量的均勻性。To observe total settlement of every part, it shall be started from the subgrade filling and together with the settlement observation.2. 沉降標志的埋設是在施工過程中進行的，施工單位的填筑施工要與標志的埋設作好協(xié)調(diào)，做到互不干擾、影響。1 mm, the reading accuracy is mm, and the survey accuracy of the profile settlement is 8 mm/30 m.（六） 沉降觀測要求 the settlement observation requirement為達到路基沉降觀測的目的，建立沉降與時間的關系，了解產(chǎn)生沉降的部位，沉降觀測應考慮如下要求。1 mm，讀數(shù)取位至 mm；剖面沉降的測量精度為 8 mm/30 m。當出現(xiàn)沉降突變、地下水變化及降雨等外部環(huán)境變化時應增加觀測頻次。本階段的沉降觀測主要進行路基面觀測樁的觀測，一般每月 1 次，必要時進行路基本體沉降及地基土沉降的觀測。本階段的沉降觀測頻度為：前 15 天每 3 天一次，第 15天后每 7 天一次。本階段的沉降觀測頻度為：第 1～15天每 3 天一次，第 16～90 天每 7 天一次，第 90～180 天每 15 天一次。本階段沉降觀測應與施工配合，每填筑一層應觀測一次；同時應保證不超過 3 天觀測 1 次。The bination form settlement board has the advantage to reduce the subgrade filling construction influence, it can be tested used for ZhengXi PDL. Before performed, it shall set the operation detailed principles, and prepare the training. The bination form settlement board subgrade settlement observation method sees the attachment 1. 預 壓 土 方級 配 碎 石 （ 基 床 表 層 ）水 泥 改 良 土 （ 基 床 底 層 ）路 堤 地 基 處 理 層 組 合 式 沉 降 板 位 移 、 沉 降 觀 測 樁位 移 、 沉 降 觀 測 樁圖 1 路堤沉降觀測斷面觀測標志布置示意圖Drawing 1 the drawing of embankment settlement observation cross section embedded the mark 預 壓 土 方級 配 碎 石 （ 基 床 表 層 ）水 泥 改 良 土 （ 基 床 底 層 ）位 移 、 沉 降 觀 測 樁組 合 式 沉 降 板位 移 、 沉 降 觀 測 樁圖 2 路塹沉降觀測斷面觀測標志布置示意圖Drawing 2 the drawing for cutting settlement observation cross 12 / 84section set the mark（四） 沉降觀測的頻度 the frequency of the settlement observation沉降觀測分為四階段進行，每個階段的沉降觀測的頻次應根據(jù)沉降的發(fā)生與發(fā)展規(guī)律及沉降大小確定，一般應按照如下觀測頻度進行。實施前應制定操作細則、做好培訓。無預壓土路塹地段，每個路塹斷面在兩側路肩各設觀測樁1 個。對地形橫向坡度大或地層橫向厚度變化的路基工點應布設不少于 1個橫向觀測斷面，每個斷面 3 組觀測點。In one settlement observation unit (continuous subgrade settlement observation section is one unit), it is no less than 2 observation cross sections.觀測點布置 set the observation point（1） 沉降觀測可在線路兩側地基、路肩和線路中心設置觀測樁；在地基和基床底層的頂面設置剖面沉降管，或在線路中心設置沉降板。地形、地質(zhì)條件變化較大地段應適當加密（以設計文件為準） ，應不大于 25m 布設一個斷面。 in the foundation treatment range the lower limit part, the settlement observation of the foundation depth.（三）觀測斷面和觀測點的布置 set the observation cross section and observation point觀測斷面布置 set the observation cross section（1） 路基沉降觀測斷面的設置及觀測斷面的觀測內(nèi)容應根據(jù)地形地質(zhì)條件、地基處理方法、路堤高度、堆載預壓等具體情況，結合沉降預測方法和工期要求具體確定。The embankment settlement is caused by embankment and the foundation. To observe the relationship between the settlement and time of the embankment and the main part that caused the settlement, generally the embankment observation content is: the subgrade total settlement of the bedding bottom layer surface and the foundation part total settlement of the foundation surface. 對于地基條件復雜和填土高度大的路堤，還包括如下內(nèi)容：路堤中部的沉降觀測；地基處理范圍的下限處地基深部的沉降觀測。The subgrade settlement observation shall mainly observe the subgrade surface settlement and foundation settlement 路塹沉降觀測部位為基床表層的底面處。In the observation period, when the actual measured settlement exceed more than 20% of the design value, it shall clarify the reason, when necessary it shall recheck the geology, and according to the actual measured result to adjust the calculation parameter, modify or adopt the settlement control measure for the design forecast settlement. 9 / 84 評估時發(fā)現(xiàn)異?，F(xiàn)象或?qū)υ加涗涃Y料存在疑問，要進行必要的檢查。觀測數(shù)據(jù)不足以評估或工后沉降評估不能滿足設計要求時，應延長