The unconfined compressive strength , shearing strength and permeabi lity of stabilized soils were tested in laboratory , the strength of contaminated composite soils sampled with different ph and soaped in corresponding ph were compared . the results from experiments indicate that there exists a certain relationship between the soft soil properties and the unconfined compressive of grouted soil . with the increase of water content , porosity ratio , degree of porosity , plasticity limit , liquid limit and liquid index , the compressive strength of cement - sodium silicate - stabilized soil decreases , while increases as the bulk weight and compressibility modulus 通过对水泥?水玻璃加固土的无侧限抗压强度试验，以及用不同酸碱性水制成与养护的固结土所进行强度对比试验，得出软土的物理力学性质指标与加固土的抗压强度之间存在一定的相关关系，即随着含水量、孔隙比、孔隙度、液塑限及液性指数的增加，水泥?水玻璃加固土的抗压强度相应地降低；而随着原状土的容重、压缩模量的增加，水泥土的抗压强度也随之增加。
Concerning the construction of the shallow cover and the special shallow cover in the tunnel under the special geology conditions , the principle of " to stabilize the slopes with protecting arch ; to strengthen the earth with the pipe - shield support grouting ; to dig a hole shallowly ; to blast slightly ; to use strong supporting structure . " has been adopted to enter the tunnel safely ; in terms of the broken belt , the effective actions such as the pipe - shield support grouting , strengthening the surrounding rock in advance with advanced bolt and steel grids , and so on , are taken to pass the poor conditioned part smoothly 对于特殊地质中的浅理、特浅埋进洞的施工，坚持“护拱稳定边仰坡，大管棚注浆加固土体，浅打眼、弱爆破、强支护”的原则，做到安全进洞；对于断层破碎带，则采取了管棚注浆，超前锚杆预先加固围岩并结合钢格栅支撑等有力措施，顺利通过了不良地段。
The principal conclusions include : ( a ) the composite system is composed of both active - bearing structural members and inactive - bearing ones , being of a character of combination of rigid retaining structures with flexible ones , so its working mechanism will be behaved as sharing loadings , waterproof and impermeability , loading transfer , local reinforcement and pre - reinforcement ; ( b ) the experimental results show that much more subsoil will participate in retaining action , soil stresses of internal slope will be shared uniformly and deflections caused by excavation will be reduced notably because of cooperation of nails and cement - soil mixing pile wall ; and ( c ) the internal forces of facing in vertical model will be a control factor of design and the cross section tensile strength of cement - soil wall will govern strength of the 主要研究结论有： ( 1 )复合土钉支护的作用机理主要为临时加固土体以保证局部稳定、有机联系以共同承担荷载、改善土体性质起到止水抗渗作用。 ( 2 )试验结果表明：复合土钉支护能够充分调动周围土体共同作用，有效地控制基坑变形；复合土钉支护中止水帷幕的插入深度和强度对控制边坡变形与失稳有较大作用；复合土钉支护效果明显优于一般的土钉支护。 ( 3 )面层与边坡土体共同变形，设计时可按外力作用下的弹性地基梁进行计算。
Effect on the characteristics of fatigue life of composite soils and dynamic modulus were discussed . the deformation behavior of stabilized soil on static and dynamic loading were compared . the characteristics of frequency spectrum of composite soils were analyzed in the thesis 对水泥?水玻璃加固土进行循环荷载下的疲劳试验研究，分析水泥?水玻璃加固土的疲劳寿命及其影响因素，以及固结土的动模量特征，并对水泥土在动、静荷载作用下的变形特征进行比较，分析对比不同振幅与频率的动荷载作用下的水泥加固土的应变响应及其频谱特性。
Some formulas have been put forward from the analysis with the combinations to engineering practice if the excavation is not too fast : 1 ) several formulas to calculate the relationships between the maximum lateral deformation and the corresponding parameters ; 2 ) a formula to predict the maximum lateral deformation ; 3 ) two optimizing formulas of the stiffness aimed for the wall and the strut system for deformation control ; 4 ) a dominant strength formula for strengthened soil under the bottom 结合工程实践(在基坑开挖不是太快的情况)分析并提出了一些公式： 1 )各参数对挡墙变形影响的效应公式； 2 )基坑在正常开挖情况下的挡墙最大侧向变形的计算公式； 3 )由变形控制所确定的内支撑挡墙与支撑自身的刚度优化公式； 4 )加固土体的强度控制公式。
Match ratio tests are done by using cement and fly - ash as curing agent , which include making soft clay with different water content into different mixing ratio cement - stabilised clay , and mixing cement and fly ash to make different cement - fly ash stengthened clay to soft clay with ascertaining water content . afterwards unconfined compression strength is tested at different curing age . the microstructures and mechanisms of cement soil and cement - fly ash soil are studied by mean " , of x - ray and scanning electron microscope ( sem ) technology 采用水泥和粉煤灰为固化剂在室内进行其配合比试验，对含水量不同的软粘土制成不同掺入比的水泥土以及对含水量值固定的软粘土制成水泥、粉煤灰掺入量分别不同的水泥-粉煤灰加固土，并在不同龄期时进行无侧限抗压强度试验；运用x射线衍射和扫描电子显微镜技术，对水泥土及水泥-粉煤灰加固软土的微观结构和机理进行分析。
The influences of the mixing amount of curing agent and curing age on the unconfined compression strength are discussed by determining the strength . by comparative study , it is concluded that the intensity of stabilized soil is the largest by using the stabilizer composed of 16 % cement mixing ratio and 40 % fly ash mixing amount , and it is reduced with growth of the water content of soft soil and is increased with growth of the cement mixing ratio and curing age 通过测定水泥土及水泥-粉煤灰加固土的无侧限抗压强度，探讨固化剂掺量、龄期对抗压强度的影响；通过对比研究发现，当水泥掺入比为16 ，粉煤灰掺入量为水泥重的40时，加固土的强度最大，并且强度随着软土含水量的增加而降低，随着水泥掺入比、养护龄期的增长，水泥土及水泥-粉煤灰加固土的抗压强度也随之增加。
Based on nonlinear finite element theory , stress and deformation behaviors are analyzed after ground stabilization and foundation pit reinforcement with deep mixing method . by comparison of the conditions of treatment and non - treatment of two examples respectively , the results indicate that the match ratio scheme used for deep mixing method is more ideal when soft clay is stabilized in this area of fuzhou in the thesis . this scheme not only can fully utilize industrial waste material , but also can economize construction cost 对于加固土的工程特性，本文以非线性有限元理论为基础，模拟分析水泥搅拌桩加固地基和基坑支护加固的应力和变形情况；通过两个例子分别在有处理和无处理情况下的对比，利用固化剂最佳掺入比来设计地基处理方案，并运用非线性有限元方法计算出土体内大小主应力的分布情况以及变形情况，结果表明本文所得出的配合比方案用于深层搅拌桩法来对福州地区软粘土进行地基加固时还是比较理想的，这样不仅充分利用工业废料，还可节约工程造价。
