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用动弹性模量换算静弹性模量KU与j的关系岩体完整系数KU换算系数j1-0.91-0.750.9-0.80.75-0.450.8-0.70.45-0.250.47-0.650.25-0.2〈0.650.2-0.1常见岩石抗拉强度岩石名称抗拉强度(公斤/厘米2)岩石名称抗拉强度(公斤/厘米2)花岗岩20~100致密石灰岩32~50辉绿岩220~320石灰岩5~15玄武岩77大理岩50~90砂岩20~5540~60片岩平行片理45~80斜交片理12~28砂质页岩30~4032~35垂直片理5~6页岩1320~30岩石承载力标准值fk(kPa)岩石强风化中等风化微风化硬质岩石500-10001500-2500≥4000软质岩石200-500700-12001500-2000dmejEE岩体渗透性分级渗透性等级标准岩体特征渗透系数(cm/s)透水率q(Lu)极微透水0-10-60-0.1含张开度<0.025mm裂隙的岩体微透水10-6-10-50.1-1含张开度0.025-0.05mm裂隙弱透水10-5-10-41-10含张开度0.05-0.1mm裂隙中等透水10-4-10-210-100含张开度0.1-0.5mm裂隙强透水10-2-1≥100含张开度0.5-2.5mm裂隙极强透水≥1含张开度>2.5mm裂隙或连通孔洞岩石质量指标(RQD)根据占孔取得的大于10CM的岩芯断块长度LP与岩芯进尺总长度LS之比RQD(%)=LP/LS×100%0—25非常不好25—50不好50—75软好75—90好90—100非常好岩体完整性系数Ku为现场岩体弹性纵波速度与室内风干或烘干岩样(或现场岩块的弹性纵波)速度(m/s)的比值的平方Ku=(Up/Up')2完整性好Ku>0.9较好Ku0.75-0.9中等Ku0.45-0.75较坏Ku0.2-0.45坏Ku<0.2岩体分类为纵横波速比VP/VSVP/VS=1.732完全弹性介质VP/VS>2.5破碎岩体2.0<VP/VS<2.5中等岩体岩土热物理指标序号岩土名称天然含水量(%)密度(Kg/m3)导热系数(W/m·k)导温系数(㎡/h)比热容(Kj/kg·K)1粉土16.315900.630.001291.11222.919201.260.001581.50326.921301.790.002641.15425.318501.450.001780.59526.019301.610.002221.356粘性土26.319901.410.001641.56719.020001.200.001521.42829.820501.660.001711.71930.121101.630.001971.411027.021701.550.001831.411129.020201.690.001841.641231.421401.850.002231.401320.020901.190.001361.5114细砂22.118001.600.002091.531511.115700.730.001651.02165.513100.640.001761.00178.014200.650.001960.841816.114600.860.002101.0119中砂7.014900.790.002010.9513.815101.060.002550.9920粗砂12.412601.060.002851.0621砾砂8.919501.410.002810.93225.316001.040.002800.8423粗砾砂23.321300.880.002281.392421.922001.750.001881.5225圆砾9.518601.40.003180.882610.518300.940.001980.9327卵石+砂9.818401.620.003580.8928砂岩22501.840.003500.8429石灰岩27003.140.004600.913022501.280.002450.843120001.160.002270.923217000.930.002140.9233大理岩、花岗岩30003.600.005170.843428003.450.004870.9135花岗岩27003.140.004600.9136石灰质凝灰岩13000.520.001570.9237灰质页岩17000.830.001661.02各类岩石的动弹模(Ed)和泊桑比(µ)岩性动弹性模量(Ed)(104公斤/厘米2)泊桑比(µ)岩浆岩花岗岩新鲜及微风化33.0~65.00.20~0.33半风化7.0~21.80.18~0.33全风化1.0~11.00.35~0.40石英闪长岩新鲜55.0~88.00.28~0.33微风化38.0~64.00.24~0.28半风化4.5~11.00.23~0.33流纹斑新鲜平行4.4~23.2新鲜垂直3.48~4.020.25~0.26玢岩新鲜34.7~39.70.28~0.29半风化3.5~20.00.24~0.40全风化2.40.39安山岩新鲜12.3~19.10.28~0.33半风化3.6~9.70.26~0.44玄武岩新鲜34.0~38.00.25~0.30半风化6.1~7.60.27~0.3全风化2.60.27沉积岩砂岩20.6~44.00.18~0.28新鲜20.6~44.00.18~0.28半风化,全风化1.1~4.50.27~0.36砂岩裂隙发育12.5~]9.50.26~0.40粘土岩9.08~36.90.15~0.37页岩0.81~71.40.17~0.36砂质页岩裂隙发育,岩体破碎0.51~2.500.24~0.45炭质页岩3.2~15.00.38~0.43石灰岩新鲜,微风化25.8~54.80.20~0.39半风化9.0~28.00.21~0.41全风化1.48~7.200.2l~0.35硅质灰岩新鲜,微风化24.8~64.80.18~0.33半风化3.8~22.80.21~0.38全风化1.0~l.760.31~0.46泥质灰岩新鲜,微风化28.0~52.50.18~0.39半风化13.1~24.80.22~0.37全风化7.20.29白云质灰岩新鲜,微风化35.9~64.00.21~0.34半风化15.5~7.80.18~0.38全风化9.30.37变质岩片麻岩新鲜,微风化22.0~35.40.21~0.25片理发育11.5~15.00.33全风化0.30~0.850.46花岗片麻岩8.0~18.00.30~0.40花岗片麻岩风化、结构松散0.60~5.100.23~0.36角闪片麻岩2.0~30.00.20~0.30角闪石英片麻岩34.4~43.40.22~0.24云母片麻岩新鲜、微风化84.6~23.80.40半风化1.48~2.330.43全风化0.04~l.100.46~0.47板岩12.6~13.20.27~0.33硅质板岩37~970.25~0.36泥质板岩5.0~5.50.25~0.29角闪片岩新鲜、致密、坚硬45.0~65.00.18~0.16角闪片岩节理发育9.8~11.60.29~0.31石英角闪片岩中等风化3.40.29云母石英片岩新鲜66.0~89.00.18~0.25云母石英片岩轻微风化45.0~51.00.22~0.29云母石英片岩中等风化33.00.25石英岩节理发育18.9~23.40.21~0.26千枚状石英岩微风化17.00.22千枚状石英岩半风化、节理发育9.0~13.00.22~0.30千枚状石英岩全风化0.50~0.800.32~0.33大理岩新鲜、坚硬47.2~66.90.28~0.35大理岩半风化、节理发育14.4~35.00.28~0.35一些岩石的E静、μ和K0参考值岩石名称弹性模量E(104公斤/厘米2)泊桑比(μ)单位弹性抗力系数K0(公斤/厘米2)花岗岩玄武岩安山岩片麻岩花岗片麻岩石英岩大理岩石灰岩泥灰岩砂岩泥质砂岩粘土岩砂质页岩33~6934~106.912.3~l9.111.5~35.45.1~18.018.9~209.047.2~66.925.8~14.713.1~52.512.5~54.31.1~4.50.98~36.919.8~36.00.18~0.330.25~0.330.26~0.440.24~0.330.23~0.400.21~0.260.28~0.350.20~0.390.29~0.380.29~0.300.27~0.360.15~0.370.17~0.365000~1500600~1500450~1000350~600500~600350~500400~600600~1200200~350100~35080~15050~100100~200各类岩体的剪切强度参数表岩体内摩擦角与岩块较接近,而内聚力则大大低于岩块。说明结构面的存在主要是降低了岩体的连结能力,进而降低其内聚力。岩体名称内聚力C(MPa)内摩擦角(φ)褐煤0.014-0.0315-18粘土岩范围0.002-0.1810-45一般0.04-0.0915-30泥岩0.0123泥灰岩0.07-0.4420-41石英岩0.01-0.5322-40闪长岩0.2-0.7530-59片麻岩0.35-1.429-68辉长岩0.76-1.3838-41页岩范围0.03-1.3633-70一般0.1-0.438-50石灰岩范围0.02-3.913-65一般0.1-138-52粉砂岩0.07-1.729-59砂质页岩0.07-0.1842-63砂岩范围0.04-2.8828-70一般1-248-60玄武岩0.06-1.436-61花岗岩范围0.1-4.1630-70一般0.2-0.545-52大理岩范围1.54-4.924-60一般3-449-55石英闪长岩1.0-2.251-61安山岩0.89-2.4553-74正长岩1-362-66围岩岩体按弹性波分类结构类型地质类型岩体结构岩体特性弹性波洞室稳定评价VP动弹模(104)整体岩性均一坚硬的火成岩体,厚层沉积岩和变质岩体。构造简单、单斜或平缓褶皱,岩体完整仅发育节理,裂隙一般闭合、无夹泥、断层很少呈柱状、块状、棱形等结构体,相互组合紧密为均一弹性或接近弹性体,岩体强度受节理控制,一般较高。发育裂隙地下水,渗流对岩体特性影响很大4000~5000>0.820~40岩体稳定性良好,要注意节理组合及分布。大洞室一般喷锚支护边坡40°~60°坝基tgф=0.6~0.7层状层状或薄层状沉积岩或变质岩体、软弱岩层或软硬相间的互层状岩体、为单斜或正常褶皱构造层面及层间错动面发育,相应有反倾向断裂。呈板状、片状结构体,互相叠合为各向异性弹塑性体或接近弹性体,岩体强度受层面及层间错动面控制。发育裂隙水或层间水,渗流对岩体特性有一定影响3000~40000.5~0.210~20岩体稳定性较好,受层面及层闻错动控制,大洞室除一般喷锚外,局部层面需深锚碎裂风化破碎岩体、岩脉穿插破碎岩体,压碎岩带,断裂密集带,迭瓦式或交叉式断裂影响带,挤压褶皱倒转褶皱带等断裂交叉发育,裂隙张开、充填夹泥,岩石破碎成碎块或板片状,间有夹泥藕合、局部夹有大块或条块状岩石结构体为不均一弹塑性体,局部夹泥多呈塑性状、岩体强度受夹泥控制、大幅度下降。发育脉状水、孔隙水渗流对岩体特性影响较大2000~35000.3~0.62~10岩体稳定性较差、有夹泥、洞室边开挖边支护或喷锚、或挂网喷锚,局部深锚加固散体剧烈风化破碎岩体,区域性或工程区大断层带、软弱岩层挤压错动带、胶结不良的断层交叉带岩体极度破碎成碎块,岩粉、碎屑、磷片状,有大量断层泥充填、呈松散堆积或压密为不均一的散体或塑性、弹塑性体、岩体强度很低、发育脉状水,孔隙水,渗沥下呈塑性,强度大为降低<2000<0.4<2岩体稳定性很差,注意地下水处理,洞室开挖紧田支护、大洞室要特殊处理围岩按岩体力学属性分类类别稳定性岩体特征稳定性计算方法I稳定完整、少量节理切割、岩性有火成岩、花岗片麻岩、石英岩、灰岩
本文标题:岩石指标参考值
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