Based on a variety of case histories of site investigations, including extensive bore hole data, laboratory testing and geophysical prospecting at more than 550 construction sites, an empirical formulation is proposed...Based on a variety of case histories of site investigations, including extensive bore hole data, laboratory testing and geophysical prospecting at more than 550 construction sites, an empirical formulation is proposed for the rapid determination of allowable bearing pressure of shallow foundations in soils and rocks. The proposed expression corroborates consistently with the results of the classical theory and is proven to be rapid, and reliable. Plate load tests have been also carried out at three different sites, in order to further confirm the validity of the proposed method. It consists of only two soil parameters, namely, the in situ measured shear wave velocity and the unit weight. The unit weight may be also determined with sufficient accuracy, by means of other empirical expressions proposed, using P or S -- wave velocities. It is indicated that once the shear and P-wave velocities are measured in situ by an appropriate geophysical survey, the allowable bearing pressure as well as the coefficient of subgrade reaction and many other elasticity parameters may be determined rapidly and reliably.展开更多
Recently,the hidden charm tetraquark states Z_(cs)(3985)and Z_(cs)(4000)with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chrom...Recently,the hidden charm tetraquark states Z_(cs)(3985)and Z_(cs)(4000)with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chromodynamics(QCD)structures.The first and foremost question is whether they are the same state.In this work,we explore the implications of the narrower state Z_(cs)(3985)in BESⅢ and the wider one Z_(cs)(4000)in LHCb as two different states.Within a solvable nonrelativistic effective field theory,we include the possible violations of heavy quark spin symmetry and SU(3)flavor symmetry in a comprehensive approach.If Z_(cs)(3985)and Z_(cs)(4000)are two different states,our results show that Z_(cs)(4000)/Z_(cs)(3985)is the pure(|D_(s)^(*)D>+/-|D_(s)D^(*)>)/√2 state,and the SU(3)flavor partner of Zc(3900)is Z_(cs)(4000)rather than the Z_(cs)(3985).Another two important consequences are the existence of a tensor D_(s)^(*)D^(*) resonance with mass about 4126 MeV and width 13 MeV,and the suppression of the decay mode Z_(cs)(3985)J/ψK.The two consequences can be tested in experiments and distinguish the two-state interpretation from the one-state scheme.展开更多
文摘Based on a variety of case histories of site investigations, including extensive bore hole data, laboratory testing and geophysical prospecting at more than 550 construction sites, an empirical formulation is proposed for the rapid determination of allowable bearing pressure of shallow foundations in soils and rocks. The proposed expression corroborates consistently with the results of the classical theory and is proven to be rapid, and reliable. Plate load tests have been also carried out at three different sites, in order to further confirm the validity of the proposed method. It consists of only two soil parameters, namely, the in situ measured shear wave velocity and the unit weight. The unit weight may be also determined with sufficient accuracy, by means of other empirical expressions proposed, using P or S -- wave velocities. It is indicated that once the shear and P-wave velocities are measured in situ by an appropriate geophysical survey, the allowable bearing pressure as well as the coefficient of subgrade reaction and many other elasticity parameters may be determined rapidly and reliably.
基金supported by the National Natural Science Foundation of China(11975033 and 12070131001)funded by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation,Project ID 196253076-TRR 110)supported by JSPS KAKENHI(20F20026)。
文摘Recently,the hidden charm tetraquark states Z_(cs)(3985)and Z_(cs)(4000)with strangeness were observed by the BESⅢ and LHCb collaborations,respectively,which are great breakthroughs for exploring exotic quantum chromodynamics(QCD)structures.The first and foremost question is whether they are the same state.In this work,we explore the implications of the narrower state Z_(cs)(3985)in BESⅢ and the wider one Z_(cs)(4000)in LHCb as two different states.Within a solvable nonrelativistic effective field theory,we include the possible violations of heavy quark spin symmetry and SU(3)flavor symmetry in a comprehensive approach.If Z_(cs)(3985)and Z_(cs)(4000)are two different states,our results show that Z_(cs)(4000)/Z_(cs)(3985)is the pure(|D_(s)^(*)D>+/-|D_(s)D^(*)>)/√2 state,and the SU(3)flavor partner of Zc(3900)is Z_(cs)(4000)rather than the Z_(cs)(3985).Another two important consequences are the existence of a tensor D_(s)^(*)D^(*) resonance with mass about 4126 MeV and width 13 MeV,and the suppression of the decay mode Z_(cs)(3985)J/ψK.The two consequences can be tested in experiments and distinguish the two-state interpretation from the one-state scheme.
