Research conclusions: These geothermal water areas belong to the geothermal zone within the Eurasian plate，mainly comprising of fracture － type geothermal zone． The geothermal water easily exposes in the fault zone，the area with complicated structure，the dike intrusion zone and the wall rock alteration zone，and it is closely related to the new tectonic movement． The temperatures of the geothermal water exposed in magmatic rocks and metamorphic rocks are high and the temperatures of the geothermal water exposed in the sedimentary rocks and Quaternary loose sediments layer are low． The main geothermal storage layers are of the soluble karst rock of the presinian，sinian and Triassic and of the granites of the Variscan and Indosinian． The insulation layers are of the metamorphic rocks，clastic rocks and loose sediments with poor water conductivity and thermal conductivity． The geothermal waters in eleven areas that influence the the railway are originated from the precipitate water and drained into river valleys or ravines after circulating and heating in the fault zones． With the CIVK program currently recommended，the geothermal water produces a little influence on the railway track，but the program needs to be improved further．

Research conclusions: The results show that，in comparison with conventional method，it is more rational to estimate the failure probability of deep excavation by use of field monitoring data． This method can effectively enhance the accuracy of excavation stability analysis and avoid the problems resulting from the errors of the inclinometer readings． The horizontal displacement monitoring data of the diaphragm wall can be used as the input information of reliability analysis． The selection of failure criteria has a significant influence on the stability analysis results． The proposed method can compensate for the limitations of conventional reliability analysis and is a promising alternative method for stability analysis of excavation based on field monitoring data．

Research conclusions: From the statistic analysis of the measured data of the foundation in soft soil area，it sis concluded: ( 1) The maximum deep horizontal displacement value of Grade A foundation pit is concentrated in the 60 －100 mm deep areas and it decreases with the increase of the excavation depth． ( 2) On the premise of no change of the support structure，the deformation volume of the support pile increases obviously，but the deformation law does not change． ( 3) The maximum horizontal displacement of the support pile is basically in nonlinear decrease state with the increase of the elastic modulus．

Research conclusions: The research shows the design method for the rigid pile composite foundation under embankment should follow the two basic principles: one is to bring the rigid pile into the major play and the other is to bring the good bearing capacity of the rigid pile into play． In order to achieve these targets，the effective way is to determine the bearing ratio between the pile and as three，enlarge the distance between piles and enhance the replacement rate． If the rigid composite foundation is designed with the proposed method and the pile reaches at the supporting course，the settlement deformation of the embankment can be controlled to meet the specification requirement of the post － construction settlement for the bridgehead and the cost can be largely reduced．

Research conclusions: After inserting the plastic drainage board in the composite foundation of the cement deep mixing pile，the effects of the drainage and consolidation in the deep buried soft soil can be speeded up to speed up the completion of the foundation settlement to reduce the post － construction settlement，the displacement development in the side direction can be speeded up and it is closely related to the drainage condition，and the improvement of the strength of the foundation soil can be speeded up and the stress ratio of the pile － soil is obviously smaller than the composite foundation of cement deep mixing pile and it favors for giving the play the load bearing capacity of the foundation soil．

Research conclusions: The maximum reinforcement depth of compaction piles should not exceed 15m． The compact pile with the depth of 15m was used for the test subgrade． The surplus settlement volume of the subgrade that had been loaded by dead load for six months could meet the control requirement of the post － construction settlement for the ballastless track，and only a little settlement occurred to the reinforced layer of the foundation after submerging． And the collapsibility of the loess in the reinforced layer was eliminated fully． In the area with the thickness of the collapsible loess less than 15m，the compact pile is an effective way to reinforce the foundation for the settlement control．

Research conclusions: By testing the silt content in interior hardened ballast and analyzing for frost heaving tests with different clay and water content，it states that the frost heaving rate is generally less than 4% when the silt content in ballast exceeds standard，and the frost heaving of ballast is the result of a combination of silt content and water content， so proof and drainage system must be good meanwhile effect of silt content on frost heaving should be paid attention to． The harmfulness of weak frost heaving behavior for ballast linear engineering treatment is greater than normal structures，and more attention should be paid．

Research conclusions: The more jacks synchronized method should be adopted preferentially when a load － dispersive anchor is tensioning and locking． There are whole pulling whole locking，whole pulling single locking，compensation tensioning，single pulling single locking and loop single pulling single locking methods when only one jack is used and tensioned one time． Among them，the whole pulling whole locking method and the whole pulling single locking method are rarely used because of much error，the compensation tensioning method is relatively reasonable since the elastic displacement difference between unit anchors has compensated and so used more often，single pulling single locking method could meet the actual demand of most engineering when pulling and locking in the order of unit anchors’length from short to long． But all the methods above are not accurate enough to add the load． The loop single pulling single locking method is based the load control，it is a new method that worthy to be lucubrated and popularized since that the load is added accurately，tensioning load loss and locking load loss is small，the work is simple，construction machinery is small，and it is appropriate for all load － dispersive anchor even when they have the different design capacity．

Research conclusions: Taking a special railway track in the coal mine as an example，on the basis of stability analysis， the limit height of soft soil embankment is obtained． In the case that the heightening requirements of the embankment under mining subsidence can not be met，the CFG pile can be used for reinforcing the subgrade． And based on the theoretical checking － calculation of the bearing capability of the composite subgrade，the comparative analysis of the settlement with finite － element method and the comparison with the reinforcing program of high － pressure jet grouting pile，the feasibility and safety of CFG pile for reinforcing soft foundation are tested and verified． The result shows the CFG pile is better for reinforcing soft foundation than the high － pressure jet grouting pile under the same conditions． According to the relative codes，the reinforcement design requirement with CFG pile is presented． The wide application CFG pile has the positive effect on making use of the wastes，saving the cost and protecting environment．

Research conclusions: The high － order prefabricating technology for the bridge pier in water has been used in foreign country，but not be used in China． From the analysis and research it is concluded the high － order prefabricating technology for the bridge pier in water is available with the features of good universal property，advanced technology，safety，reliability and and good economical efficiency． After further optimization and tests， the high － order prefabricating technology for the bridge pier in water can be widely used．

Research conclusions: By taking maoyushan tunnel as the research object，the displacement release rate corresponding various location and dimension of the super pilot tunnel was studied in the paper through numeric simulation． The two －dimensional analysis show that the reasonable dimension of the super pilot tunnel was 7． 6m( width) × 5． 5m( height) ．The reasonable distance between the pilot tunnel vault and the right holr vault was 2． 5m． The displacement release rate fo A snd BB `and CC `and DD `were respevtively 37% ，54% ，72% and 59% ． This paper can provide reference for construction and design of other similar projects．

Research conclusions: By making theoretic analysis，numerical simulation，in － site test and conducting the advanced geological forecast，the deep study was done on the key technologies，including the risk management of construction of submarine tunnel，construction for the fault fracture zone，construction of the shallow crossing large span，construction of rooms with small clear distance，construction of crossing chambers，and rapid construction with boring blast method． The construction risk management information system was set up． The double － channel grouting device and the new technique of the rapid curtain grouting without grouting stop wall for the fracture rock ( fault fracture zone ) were developed． The construction technologies for plane crossing chambers and stereoscopic crossing chambers were optimized and the set complete technology of the boring and blast was summarized for promoting the progress of the Chines technology for construction of submarine tunnel．

Research conclusions: ( 1) The plugger that is passed through by water but not by mud can be used by grouting into the deep hole on the ground． ( 2) Based on meeting the quality reuirement，the construction speed can be doubled by using the informalization comprehensive grouting technology，compared with the full face curtain grouting technology． ( 3) the principle of drainage for reducing the pressure，the grouting for reinforcing and the pipe roof for supporting can be used for reinforcing the breaking open caused by water and mud bursting．

Research conclusions: ( 1) The particle composition of the granitoid residual soil in dongguan has features of big ends， small middle part，big natural pore，small liquidity index，strong shear strength，big compressive coefficient，small compressive modulus and small the expansive property． ( 2) There is a lineal relation between the natural pore and the compressive modulus． ( 3) The in － situ test should be used along with the indoor test for the investigation．

Research conclusions: The research shows that tubular skylight system is better than electric lighting in energy saving，environmental protection and safety，it can bring considerable social and economic benefits． Tubular skylight system can effectively reduce the consumption of power for lighting in daytime，make full use of solar energy，which meet a net －zero carbon emissions goal． So，it is feasible to use tubular skylight system in metro engineering，and it is available to popularize and apply．

Research conclusions: The difference between reinforcing the soil on the ends with freezing method and reinforcing the ordinary foundation is that the former has the requirement of the freezing temperature． Only when the freezing temperature is guaranteed can the soil strength on the ends be guaranteed and the risks of sand and water bursting be effectively controlled． In order to avoid the appearance of accident，the relative measures should be taken such as using small propulsive force，slow cutting and avoiding the freezing of the cutter head when the shield machine passes through the soil on ends．

Research conclusions: The safety of passenger dedicated line must be put in the first place during the construction project near the passenger dedicated line，the policy of the " safety first，precaution crucial and comprehensive control" must be insisted on and the principle of the " consideration of the transport and construction together" should be followed to ensure the completion of transport and construction．

Research conclusions: ( 1) The material market price should be as the material general estimate prise for the project with new general estimate． The prise different coefficient should be used for adjusting the general estimate made with the basic prise method for the approved project． The recalculation of the prises of the materials supplied by Party A should be made when checking up the general estimate and the cost of the materials supplied by Party A with settling accounts should be adjusted on the base of the recalculation． ( 2) The dynamical adjustment should be made for the materials quantities as the actual supply limit and the materials saved by contractor should not be deduced from the contract．