強(qiáng)夯法和強(qiáng)夯置換法計(jì)算書(shū)

強(qiáng)夯法和強(qiáng)夯置換法計(jì)算書(shū)計(jì)算依據(jù)：1、《建筑地基處理技術(shù)規(guī)范》JGJ79-20122、《建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范》GB50007-20113、《建筑樁基技術(shù)規(guī)范》JGJ94-20084、《建筑施工計(jì)算手冊(cè)》江正榮編著一、基本參數(shù)夯實(shí)方式強(qiáng)夯法強(qiáng)夯法的有效加固深度(m)5夯點(diǎn)的夯擊次數(shù)5夯擊遍數(shù)2兩遍夯擊之間的時(shí)間間隔(d)14夯擊點(diǎn)的布置方式等邊三角形上部結(jié)構(gòu)傳至基礎(chǔ)頂面的豎向力F(kN)5000基礎(chǔ)底面以上土層的平均重度γ(kN/m3)19.06基礎(chǔ)及其上覆蓋土的平均重度γ0(kN/m3)20基礎(chǔ)尺寸(m)【長(zhǎng)l×寬b】3×2基礎(chǔ)埋置深度d(m)1.7地下水位深度hw(m)3基底處地基承載力特征值fak(kPa)150土層分層厚度(m)0.5相鄰基礎(chǔ)個(gè)數(shù)n2相鄰基礎(chǔ)距本基礎(chǔ)的距離D(m)2.1二、土層參數(shù)土層名稱(chēng)土層厚度hi(m)土的重度γi(kN/m3)土的壓縮模量Esi(MPa)粉砂1.5195.5粘性土2.219.56.5細(xì)砂3186簡(jiǎn)圖如下:基礎(chǔ)剖面圖三、地基承載力設(shè)計(jì)值計(jì)算基礎(chǔ)寬度對(duì)地基承載力的修正系數(shù)ηb0.15基礎(chǔ)埋深對(duì)地基承載力的修正系數(shù)ηd0.4墊層底面處地基承載力設(shè)計(jì)值：fa=fak+ηbγ1(b-3)+ηdγ(d-0.5)=150+0.15×19×(3-3)+0.4×19.06×(1.7-0.5)=159.149kPa四、沉降計(jì)算1、基礎(chǔ)底面附加應(yīng)力計(jì)算P0=F/A+(γ0-γ)d=5000/(3×2)+(20-19.06)×1.7=834.931kN/m32、分層變形量計(jì)算zi(m)基礎(chǔ)中心處平均附加應(yīng)力系數(shù)αi相鄰基礎(chǔ)影響αi總附加應(yīng)力系數(shù)αi總zi×αi總zi×αi總-zi-1×αi-1總土的壓縮模量Esi(MPa)AiΔsiΣΔsi0.54×0.24642×2×(0.2489-0.247)0.99320.49660.49665.50.498375.38775.38714×0.23192×2×(0.2436-0.2343)0.96480.96480.46825.50.489571.075146.4621.54×0.21082×2×(0.2341-0.2149)0.921.380.41525.50.471263.03209.49224×0.18942×2×(0.2219-0.1944)0.86761.73520.35526.50.446945.626255.1182.54×0.172×2×(0.209-0.1754)0.81442.0360.30086.50.420538.638293.75634×0.15332×2×(0.1962-0.1588)0.76282.28840.25246.50.394332.421326.1773.54×0.13912×2×(0.1841-0.1445)0.71482.50180.21346.50.369427.411353.5883.74×0.13412×2×(0.1795-0.1393)0.69722.57960.07786.50.14129.993363.5814.24×0.12282×2×(0.1686-0.1278)0.65442.74850.168960.337923.503387.0844.74×0.11312×2×(0.1588-0.118)0.61562.89330.144860.317520.15407.2345.24×0.10482×2×(0.1498-0.1094)0.58083.02020.126960.299117.659424.8933、確定基礎(chǔ)變形計(jì)算深度△s'n根據(jù)《規(guī)范》GB50007-2011表5.3.7得：△z=0.3m則當(dāng)前計(jì)算深度向上取厚度為△z的土層深度:z'=5.2-0.3=4.9m此層土的變形值：Δs'n=P0(zi×αi總-zi-1×αi-1總)/Esi=834.931×(5.2×0.5808-4.9×0.6012)/6=10.336mm△s'n/∑△s=10.336/424.893=0.0243≤0.025滿(mǎn)足要求。4、地基最終變形量計(jì)算∑Ai=4.1858Es=5.988Mpa，查《規(guī)范》GB5000