CFG樁復(fù)合地基處理工程計(jì)算書

1、 1、面積置換率計(jì)算rn=ra up q l a q a+f = maspksksi pip ppa，pf式中： spk復(fù)合地基承載力特征值，取值為 180kpa；apm面積置換率；ra 單樁承載力特征值（kn）；樁間土強(qiáng)度的發(fā)揮系數(shù)，按規(guī)范取 0.90；upqsili 第 i 層土的厚度；qp單樁承載力 r 計(jì)算和取值表a樁側(cè)土側(cè)阻力特征 樁端端阻力特征值 單樁承載力特征層厚（kpa）a素填土0.121.901225/zk1267.79硬塑粘土素填土2.481.404512950/2.9030/264.77264.77硬塑粘土素填土1.201.404512950/zk4 附近. 硬塑粘土素填

2、土2.802.132.875.054.453.053.952.501.942.2045950/124512351235451235zk5261.38274.31硬塑粘土素填土950/zk7可塑粘土素填土380/zk8228.70214.99可塑粘土硬塑粘土素填土380950/zk11可塑粘土/zk12zk14267.72273.341.4025/硬塑粘土素填土0.561.803.2045950/1245硬塑粘土950取值 ra =200kn取 ra =200kn 進(jìn)行計(jì)算。rlf = maapm0.078322、樁位布置m=d / d2e2式中：m實(shí)際置換率；n同一承臺內(nèi)樁數(shù)量；a 樁截面積，

3、0.09616m （樁徑 d=0.35m）；2pa承臺面積；d樁身平均直徑(m)；d 一根樁分擔(dān)的處理地基面積的等效直徑(m)；正方形布樁 d =1.13s，矩形布樁 d =1.13 s s ，1 2eees、s 、s 分別為樁間距、縱向樁間距和橫向樁間距。12. .承臺尺寸樁位間距樓號 序號 承臺類型樁徑(mm)(mm)樁根數(shù)0.10650.10010.10010.10450.09480.09380.11530.10570.09750.09580.10220.10900.10650.10010.11030.2275-2.10m(局部1#樓2.6m)4 根6 根9 根djj-04 1300x1

4、300800x800350mm4 根10400x390350mm1100x11000.09480.09380.11530.10570.10450.09580.11610.09750.1001350mmdjj-06 3000x4100 1100x1100350mm950x11001150x900850x1300-1.60m2#樓350mm350mm350mm10 djj-10 2800x4300 1000x1200350mm850x12001150x950950x1100350mm350mm. 350mm850x13001100x9000.10450.1190350mm以上布樁均滿足na 樁截面

5、積，0.09616m （樁徑 d=0.35m）；2pa承臺面積。根據(jù)以上單樁承載力計(jì)算可知，按上表樁間距布置cfg 樁，有效最短樁長不應(yīng)小于2.5m，才能滿足上部荷載的要求，復(fù)合地基承載力特征值fspk200kpa。3、樁體強(qiáng)度選擇f 4式中：f 樁體混合料試塊 28d 立方體抗壓強(qiáng)度平均值。acuapl2pra單樁承載力特征值 200（kn）；cu4、復(fù)合地基承載力驗(yàn)算m=pa(1)根據(jù)式中：m實(shí)際置換率；n同一承臺內(nèi)樁數(shù)量；a 樁截面積，0.09616m （樁徑 d=0.35m）；2pa承臺面積；并根據(jù)各類型基礎(chǔ) cfg 樁布樁形式及樁距，經(jīng)計(jì)算，復(fù)合地基面積置換率 m 值均可滿足設(shè)計(jì)要求

6、；(2)復(fù)合地基承載力驗(yàn)算rlf = maapf式中： spk復(fù)合地基承載力特征值；l. .m面積置換率，計(jì)算時(shí)取實(shí)際置換率，見布樁大樣圖；ra單樁承載力特征值（kn）；復(fù)合地基承載力計(jì)算結(jié)果見下表。復(fù)合地基承載力計(jì)算結(jié)果表處理后的樁間土承樁間土強(qiáng) 復(fù)合地基承實(shí)際面積載力特征值 fsk 單樁承載力（kpa）按最不利考發(fā)揮系數(shù)樓號 基礎(chǔ)型號度發(fā)揮系 載力特征值慮spk0.10650.10010.10010.10450.09480.09380.11530.10570.09750.09580.10220.10900.10650.10010.11030.22750.09480.09380.11530.

7、10570.10450.0958264.77269.70274.40260.16267.10274.30278.10228.43261.81245.06228.43261.74214.99224.88262.58257.19264.67334.78273.35364.89265.44295.36606060606060606060606060606060606060606060600.800.800.800.800.800.800.800.800.800.800.800.800.80.900.900.900.900.900.900.900.900.900.900.900.900.9282.84

8、273.20277.11274.54259.54262.99314.54249.17261.10244.14242.70285.47238.74235.87289.00528.49257.62310.19309.98369.16279.13284.23djj-070.80.90.80.90.80.90.80.9djj-060.80.90.80.90.80.90.80.90.80.9. .0.11610.09750.10010.10450.1190340.75272.62219.94606060376.86269.87231.76243.86367.57224.88323.226060地基處理后

9、的變形計(jì)算應(yīng)按現(xiàn)行的國家標(biāo)準(zhǔn)建筑地基處理技術(shù)規(guī)范（ jgj79-2012）的有關(guān)規(guī)定執(zhí)行，復(fù)合地基的壓縮模量等于該天然地基壓縮模量 倍，按勘察報(bào)告提供的樁間土承載力特征值（素ak =f /f （f 為處理后的復(fù)合地基承載力， 為壓縮模量提高系數(shù)）,各土層處理后的壓縮模量spk akspk. 本工程根據(jù)場地地質(zhì)條件和上部結(jié)構(gòu)荷載選取最不利位置進(jìn)行估算。 a ) /， e = apaen= b(2.5- 0.4 lnb) d 0.025 d ， s s 計(jì)算變形s = s =nossiii - 1 i - 1siniesii=1i=1sy 沉降經(jīng)驗(yàn)系數(shù)，根據(jù)變形計(jì)算深度范圍內(nèi)壓縮模量的當(dāng)量值( )

10、、基底附加壓力按建筑地基處理技術(shù)規(guī)essp0ez、z 基礎(chǔ)底面至第 層土、第ii - 1ii. 計(jì)算壓縮計(jì)算z (mp (kpa) n壓縮模量模量提4土層模量值z項(xiàng)目0)akspk高系數(shù)iissi602.9015.4254.85硬塑粘土19012010.316.2433.2031914.0硬塑粘土硬塑粘土19019010.3110.3154.8510.31粉土110605.422.905.421.000素填土硬塑粘土硬塑粘土粉土13.874.78 1.40 0.2491 1.39504.78 5.00 0.2285 3.17501.00 7.60 0.2059 1.68941.00 9.80

11、0.1875 1.09061901901106010.3110.315.4249.2810.315.4228732413.814.22.9015.66可塑粘土硬塑粘土可塑粘土1301901307.2810.317.2839.3155.6739.31180 14.0803.7620.305.40 5.90 0.2307. 硬塑粘土硬塑粘土19019010.3110.3155.6710.311.000.1942014.00粉土1105.425.421.000.1734素填土602.907.2816.8242.2259.8042.225.80 1.98 0.2483 1.9665可塑粘土硬塑粘土可塑

12、粘土1301901305.805.805.8010.317.2834813.2803.7621.815.805.80硬塑粘土硬塑粘土粉土19019011010.3110.315.4259.8010.315.421.00 10.6 0.1869 2.18901.00 16 0.1497 1.6562計(jì)算項(xiàng)目z (mp (kpa) n壓縮模量4土層f (kpa) f (kpa)z(mp0)akspke (mpa)iisse (mpa)si60802.903.7614.024.83 0.14 0.2499 0.13994.83 2.02 0.2448 1.838018.16180 13.029011

13、.0硬塑粘土硬塑粘土19019010.3110.3149.8010.314.83 4.50 0.2207 1.99461.00 5.90 0.2043 0.8489. .13.00粉土1105.425.421.00602.9010.3110.3112.8645.6710.314.43 2.10 0.2464 2.06984.43 5.00 0.2225 2.38021901901.00 8.00 0.1890 1.598013.626611.71307.287.281.00017.00110605.422.903.765.4213.3417.301.00素填土4.60 3.18 0.2322 2.9536804.60 4.08 0.2217 0.664627616.7硬塑粘土硬塑粘土素填土1901906010.3110.312.9047.4