The numerical solution of finite element for bending - compression column with different tension - compression modulus 拉壓不同模量彎壓柱的有限元數值解
By comparing difference in compression modulus before and after grouting and detection of seismic waves , the authors concluded that the seismic wave method is a good method for detecting effects of grouting in highway slopes 通過對坡體在灌漿前后彈性參數的對比分析,說明用地震波法檢測公路邊坡灌漿加固效果是一種較好的方法。
Under the condition of immovability of the charging area of blast hole , the increase of the blast hole compression modulus not only improved fragmentation results but also decreased the blasting ground vibration because of the minishing of burden 在不改變單個炮孔負擔面積的條件下,增大密集系數可以改善爆破效果,同時由于抵抗線減小,爆破震動也有所降低。
Then the judging method is proposed , and the proposed method can consider the stress history and viscosity shear strength of soft soil . in this paper , a fem program dpfbm1 . 0 ( double plastic foundation beam method ( version 1 . 0 ) ) is established . with this program , the influence of some parameters on foundation excavation is fully studied , the parameters include : compression modulus , cohesive strength , angle of internal ficiction , effective angle of internal friction , the embedded length of the wall and building load 針對當前國內外彈性地基梁法存在的缺陷,基于對軟土流變性的研究,采取了剪應力判斷彈塑性狀態,以改進和完善基坑工程彈性地基梁法,推導了彈性狀態下地基反力系數的近似解,提出了采用剪應力組合判斷土彈簧彈塑性狀態的方法,編制了相應的彈塑性共同變形法分析程序dpfbm1 . 0 ( doubleplasticfoundationbeammethod ( version1 . 0 ) ) ,并采用該程序分析了壓縮模量、粘聚力、內摩擦角等參數變化對基坑工程的影響。
In this paper , the influence of cycles of drying and wetting on strength and deformation are studied by means of routine direct shear apparatus , triaxial apparatus and light consolidation apparatus which include : the influence of force of constraint on strength , the total stress strength of expansive soils with different saturation degree , the influence of cycles of drying and wetting on the total stress strength , the relation between saturation degree and compression modulus and that between saturation degree and void ratio , the influence of cycles of drying and wetting on the effective stress strength , the relation between saturation degree and generalized suction 本文利用常規直剪儀、三軸儀以及輕便固結儀,分別對非飽和膨脹土的強度和變形特性以及干濕循環對強度和變形的影響進行了一系列的試驗研究。以飽和度、干濕循環次數為變量,分別探求了外力約束對膨脹土強度的影響,不同飽和度膨脹土的總應力強度特性,干濕循環對非飽和膨脹土總應力強度的影響,飽和度與壓縮模量以及孔隙比的關系,干濕循環對飽和膨脹土有效應力強度指標的影響,廣義吸力與飽和度的關系,建議了一組計算非飽和膨脹土變形及強度特性的經驗公式。
Based on the previous theoretical analysis , two practical projects of pile - raft foundation of high - rise building on soft ground are studied by using the software of pile - raft foundation interaction analysis program pogap . the choice of standing layer for pile , the rational compression modulus of soil under pile , the place of pile and the space between piles , and the reasonable thickness of plate are analyzed , some well - regulated conclusions can be achieved . an experiential equation for choosing the optimal thickness of plate is also given 根據以上分析,結合兩個軟弱地基上高層建筑樁筏基礎的工程實例,利用浙江大學巖土工程研究所編制的pogap樁筏基礎共同作用分析軟件,就樁端持力層的選擇,樁端下臥層壓縮模量合理選值,樁位及樁間距的確定,筏板厚度的合理取值等問題展開分析,得出了一些規律性的結論,提出了筏板最佳板厚取值的經驗公式。
The result indicates that in the case of constant content of asphalt , marshall stability , compression strength , rupture strength , compression modulus and rupture modulus of cement emulsified asphalt concrete would increase along with the increase in cement content ; in the case of constant content of cement , these index values would decrease along with the increase in asphalt content ; while with the increase of coarse aggregate , rupture strength and rupture modulus of the concrete would increase conspicuously , yet compression strength and compression modulus would have a little change 試驗結果表明:在乳化瀝青含量不變時,隨著水泥用量的增加水泥乳化瀝青混凝土的馬歇爾穩定度、抗壓強度、抗折強度、抗壓回彈模量、抗折回彈模量隨之增加;在水泥用量不變時,隨著乳化瀝青用量的增加相應的力學指標呈降低趨勢;礦料級配中粗集料含量增加后,混合料的抗折強度和抗折回彈模量有明顯增加,但抗壓強度和抗壓回彈模量變化不大。